Download Specs Part I - Jaipur Vidyut Vitran Nigam Limited ,Government of

JAIPUR
Office of the Superintending Engineer (JCC)
Bani Park, Near Ram Mandir, Jaipur -302006(Rajasthan)
TENDER SPECIFICATION
FOR
“Supply, Erection, Testing & Commissioning of SCADA Compatible
Equipment’s in Jaipur City on Turn-Key Basis
against Package No. SE/JCC/TN-01(Lot-I, II, III)”
VOLUME - III
PACKAGE No. SE/JCC/TN-01(Lot-I, II, III)
Last date & time for submission of Proposal is
28.06.2013 up to 14.30
Part : I
TECHNICAL SPECIFICATIONS
TN-01/1
INDEX
S. No
Name of Item
Pages No.
1.
36 KV INDOOR TYPE VACUUM CIRCUIT BREAKERS
3-25
2.
36 KV OUTDOOR TYPE VACUUM CIRCUIT BREAKERS
3.
12 KV INDOOR TYPE VACUUM CIRCUIT BREAKERS
38-54
4.
12 KV OUTDOOR TYPE VACUUM CIRCUIT BREAKERS
55-71
5.
33 KV CONTROL AND RELAY PANEL
26-37
72-96
6.
12 KV Ring Mains Unit
7.
33KV OUTDOOR LOAD BREAK SWITCH
115-122
8.
11 KV OUTDOOR LOAD BREAK SWITCH
123-130
9.
Cable Jointing Kits
131-139
10.
33 KV outdoor CT’s
140-147
11.
11 KV XLPE cable
148-156
12.
DT Structure
13.
Numerical Relay
14
Shunt Trip Arrangement
97-114
157
158-159
160
TN-01/2
TECHNICAL SPECIFICATION OF 36 KV INDOOR TYPE
VACUUM CIRCUIT BREAKERS
1.0
SCOPE :
This
specification
manufacturer's
covers
works
the
design, manufacture, assembly,
testing
at
before dispatch, supply, delivery of 3 pole, 50 Hz, 36 KV
switchgear and control gear panels for indoor installation fitted with 36 KV vacuum
circuit breakers including voltage transformers, current transformers,
metering
instruments, protection relays etc. as per schedule of requirement and installation
& commissioning by the supplier as per Schedule-III (Part-B). The power system is
with neutral solidly earthed.
The equipment offered shall be safe, reliable and
compact to install. The workmanship shall be of high order. The circuit breaker and
protective devices
shall be of latest design so as to ensure rapid and
efficient
interruption of fault current, low arc energy, small arcing time, complete phase
segregation and freedom from fire hazards.
1.1 STANDARDS :
The
circuit
breaker/metal
enclosed
switchgear, Voltage transformers, current
transformers and all other equipment shall also comply with the requirement of
latest edition of relevant Indian standards. Deviation from the standards and this
specification if any, should be brought out in the tender and justified. Voltage
transformer
and current transformers shall be mounted within the panels. The
governing standard shall be
S.
No.
1.
2.
IS/IEC
Reference
IEC-62271/
100-200
IEC-298
3.
IS-3427
4.
IS-8623
5.
6.
7.
IS-13118
IEC-56
IEC-529
IS-5578 & 11353
8.
9.
IS-325
IS-2629
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
IEC-137
IS-3347
IS-5561
IS-3156
IS-2705
IS-3231
IS-13010
IS-13779
IS-8686
IS-1248
IS-2099
IS-10118
IEC-694
Specification
High Voltage Switchgear & Control gear
A.C. Metal – enclosed and control gear for rated voltages
above 1KV and including 72.5KV
A.C. Metal – enclosed and control gear for rated voltages
above 1KV and including 52KV.
Specification for Low Voltage Switchgear and Control gear
assemblies.
Specification for High Voltage AC Circuit Breakers.
Degrees of Protection.
Marking and arrangement for switchgear bus bar main
connections and auxiliary wiring.
Specification for 3 Phase Induction motors.
Recommended practice for hot dip galvanizing of iron and
steel.
Bushing for AC Voltages.
Porcelain Transformer Bushings.
Terminal Connectors
Voltage Transformers
Current Transformers
Electric relays for power protection.
Static Energy Meters
Static Protection Relays
Electrical measuring instruments
High Voltage Porcelain Bushings.
Minimum clearances for Outdoor Switchgear.
Common Clauses for High Voltage Switchgear and Control
TN-01/3
23.
gear.
Numerical Relays
IEC-60255 &
IEC-61330
Equipment’s
conforming
which ensure(s) equal
would
also be
or
accepted.
to
any
other
internationally accepted
standard(s)
better quality than the standard(s) mentioned above
In
case
conforming to other standards or
the
tenderers
alternative
offer
wish
to
offer
equipment
which tenderer considers
advisable by reason of his own manufacturing requirement and experience would
be acceptable provided descriptive matter, literature and complete certificates
are submitted pointing
out that
the equipment/devices/arrangements as offered
are equal or superior to that required by the accompanying specification
with
full justification. They shall furnish English translation of the relevant standards
where
the
equipment conforms to any
difference between
other
standards.
Salient
points
of
the standards adopted and those mentioned above shall be
brought out.
1.2
a) PARTICULARS OF SYSTEM :
i) Nominal system voltage
: 33 KV
ii) Highest system voltage
: 36 KV
iii) Frequency
: 50 Hz
iv) No. of phases
: 03
v) Neutral earthing
: Effectively earthed
b) SERVICE CONDITIONS :
The equipment should operate satisfactorily under the climatic conditions specified
in this specification. The
reference
maximum ambient Air temperature may be
taken as 50 Deg. C. as against 40 Deg. C. The permissible temperature rise for
various equipment’s offered should therefore be derated accordingly.
1.2.1 CLIMATIC CONDITIONS:
i) Peak ambient air temperature
in shade.
ii) Minimum ambient air temperature
in shade.
iii) Maximum relative humidity
iv) Minimum relative humidity
v) Dust storms are liable to occur
from the period from March to July.
vi) Height above mean sea level
vii) Average number of thunder
storm days per annum.
viii) Average annual rainfall
(Depending on area)
ix) Number of months of tropical
monsoon conditions p.a.
1.3
50 DEG C
(-) 5 DEG C
95%
10%
Less than 1000M
40 Days
10-100 cm
June to Sept.
PRINCIPAL PARAMETERS
1.3.1 CIRCUIT BREAKERS :
a) Rating and characteristics of circuit breakers :
1. No. of poles
:
2. Class
:
3. Rated voltage
:
4. Rated insulation level
a) Light-ning impulse voltage
:
b) One minute power frequency :
TN-01/4
3
Indoor
36 KV
170 KV (Peak)
70 KV (rms)
withstand voltage.
Rated frequency
Rated normal current
Short circuit breaking capacity
Short time withstand current
for 3 secs.
9. Protection class
10. Maximum opening time
11. Rated operating sequence
5.
6.
7.
8.
b)
:
:
:
:
50 Hz
800 A
25 KA
25 KA
:
:
:
IP 5X
Less than 3 Cycles
O-0.3 Sec.-CO-3min-CO
12. Minimum operations at full
rated short circuit breaking
current.
13. Rated Breaking Capacity
i) Symmetrical
ii) Asymmetrical
14. Rated making capacity
15. Operating Mechanism
:
100
:
:
:
16. Heater/Lamp/Socket
:
25 KA
As per relevant Standards
2.50x25 KA
Motor operated Spring
charged closing
mechanism.
240 V A/C
17. Control Voltage
:
110V DC
:
Characteristics of the operating mechanism of Circuit breaker and associated
equipment :
i) Method of operation : The circuit breakers shall be equipped with power operated
mechanism to operate all the
three phases
simultaneously using
universal motor operated spring closing mechanism.
also
be
provided
with
hand
operated
The circuit
220/240V
breakers
shall
spring closing mechanism. The Circuit
Breaker shall have electrical and mechanical tripping arrangements under various
conditions. In case of spring closing mechanism no main spring of the mechanism
shall be plated, powder coated or given any other treatment so that spring
property is not lost.
ii)
Number
and
type of spare,
auxiliary switches/ contacts
auxiliary
switches
:
Adequate
number of spare
both of normally open and normally close type but
not less than eight each shall be provided on the circuit breaker for use in the
indication and controlling scheme of the circuit breaker.
iii)
Rated
supply voltage and rated supply
frequency
: The rated voltage for the
auxiliary supply shall be 240 V, 50 Hz AC supply.
1.3.2
DESIGN CRITERIA
The bidder shall quote 36 KV Indoor type Vacuum Circuit Breakers
conforming to M-2 class only. The equipment will be used in high voltage system
having characteristics
as
listed in
the
specification.
The
equipment
will be
installed indoor in a hot, humid and tropical atmosphere.
All
equipment, accessories and wiring shall
have tropical protection, involving
special treatment of metal and insulation against fungus, insects and corrosion.
The maximum temperature in any part of the equipment at specified rating shall not
exceed the permissible limits as stipulated in the relevant standards and this
specification.
TN-01/5
The
equipment
shall
be capable
of
withstanding
the dynamic
and
thermal
stresses of listed short circuit current without any damage or deterioration.
The safety clearances of all live parts of the equipment
shall be as per relevant
standards.
1.3.3 CONSTRUCTIONAL FEATURES :
a)
The circuit breakers shall be triple
pole metal clad truck mounted
horizontal
drawout type enclosed in cubicle made of CRCA sheet steel of minimum 3 mm
thickness and shall comply with latest edition of relevant IS. The cubicle/ panels
shall
be
vermin
proof and dust tight. The cubicle shall be of folded type
construction. The switchgears and
control
gear
shall
be
complete
with
all
necessary supporting frame work, nuts and bolts etc. for securing the same to the
floor. The operating mechanism shall operate (close/open) all the three phases
simultaneously.
The
operating
mechanism,
links
etc. should be accessible for
maintenance. Mechanical safety shutters should be provided between breaker and
panel. Engagement and disengagement of auxiliary supply should be automatically
linked through the movement of the truck so that in service condition auxiliary
supply is automatically made. All six terminals shall brought out of cubicle through
appropriate class of cable termination and sealing kits. All the breakers shall be
supplied with necessary clamps suitable for appropriate current ratings.
Suitable
arrangement of earthing on the switchgear and control
shall be
gear panels
provided. The arcing contacts shall be made of homogeneous special alloy so that
surge voltages are reduced to negligible level and multiple
arc reignition is
eliminated. All the connecting bus bar & current carrying parts shall be made of
copper for these indoor circuit
b)
breakers.
For indoor panels, SWITCHGEAR (circuit breakers, CTs, PTs etc.) and controlgear
(relays, meters etc.) shall be mounted on the same panel. A set of air insulated
electrolytic copper bus bars having maximum current density 1.5 Amp./ mm2 with
minimum cross sectional area of 720 mm2 with PVC sleeves or PVC insulation are to
be provided
for
all indoor switchgear panels.
The switchgear panels shall be
provided with the arrangement for extending the bus bar and inter-connecting bus
bars. Their supports, nuts and bolts etc. will be supplied loose. The region of
such inter connection
shall normally be blanked on panels. The bus bars should
be of electrolytic copper with permissible limits of current density. Size of the bus
bar and current density should be specified in the tender. The bus bar conductor
shall conform to IS:8034. The bus bar shall be rated for 25KA for 3 Seconds.
c)
The following safety interlocks & features are required to be provided in the
breaker:1) For VCB Chamber
i)
Rack in Operation from Test to Service:It should not be possible to rack in the VCB Truck unless & until the VCB is in
switched off condition, VCB chamber door is closed, LV Control plug is connected
& locked and the Cable earthing switch (if provided) is switched off.
TN-01/6
ii)
Rack Out Operation from Service to Test:It should not be possible to rack out the VCB Truck unless & until the VCB is in
switched off condition.
iii)
For earthing switch in cable chamber:
It should not be possible to operate the earthing switch unless & until the
respective VCB Truck is in test condition.
iv)
The movement of VCB shall be duly interlocked so that it can not be racked
in to service position in pre closed condition & it is not possible to rack out
from service position in pre closed condition. Any attempt to close the VCB
into intermediate position shall be blocked by sustained mechanical tripped
command overriding on to the mechanism to avoid closure of the contacts of
VCB. Any attempt to cause the movement of VCB shall initiate the tripping of
a VCB and only thereafter the movement shall be facilitated.
v)
The mechanism shall be trip free type with inherent capability of O-CO
operation.
vi)
The Circuit Breaker should be designed in such a manner that there should
be proper metal compartmentalization of the various circuit
breaker parts
such as breaker chamber, Bus bar chamber & Cable chamber.
vii)
Test and service position limit switches shall be provided.
viii)
The provision should be made to avoid accidental contact & access to the
high electrically stressed area by providing appropriate touch to safe metal
screens when the VCB is posed into service position inside the cubical.
ix)
No separate VCB handling trolley shall be required to insert the VCB inside
the panel. The VCB shall be floor rolling type.
x)
The VCB should be provided with proper interlock for the secondary isolating
plug & socket type contacts so that it is not possible to insert the VCB from
the test to service position unless the secondary plug socket is connected & it
is not possible to remove the secondary plug socket into intermediate
position & in service position.
xi)
The insulation used shall be non hygroscopic & non deformable type and it
should be free from any partial discharge when exposed to sustain over
voltages.
xii)
The VCB shall be completely type tested as per IEC 62271-100/200 or ISS.
xiii)
The operating instruments like switches etc shall be placed at height less
than 1900mm.
xiv)
The total height of the panel should not exceed more than 2700mm and
width should not exceed 1200mm.
xv)
The panel should be designed totally on air clearances basis with no
dependency on the external shrouds & add on insulations.
xvi)
The panel shall have epoxy spout insulators between the bus bar & VCB
chamber to have proper compartmentalization.
TN-01/7
xvii)
The bus risers shall be epoxy coated and should be integral part of the spout
bushings.
xviii)
Entire bus bar compartment is provided with solid insulation scheme to have
less dependency on the inter phase barriers.
xix)
The panel shall have rigid sheet steel construction for better stability and
shall be self standing without the external bracings.
xx)
The panel should be designed to have gravity operated self resetting type
pressure relief flaps to have internal arc fault proof design.
xxi)
The panel should have integral foundation frame.
xxii)
The CT’s shall be top terminal CT’s and mounted on the panel base frame to
facilitate easy mounting and serviceability.
xxiii)
Adequate cable termination space of around 700mm shall be provided with
facility to terminate 3 cables of 3CX400 sq. mm size.
xxiv)
Panel should be provided with independently operated, insulated type non
metallic shutters with pad locking facility. The shutters shall automatically
operate with the VCB trolley movement.
xxv)
The multi-core cable entry should be provided optimally from front or rear
side of the panel. The necessary arrangement of cable entry from Left Hand/
Right Hand side through self-standing side cable boxes should also be made.
xxvi)
Hinges of door shall be concealed type to avoid rusting and obstructive
opening of the door.
xxvii) The quality of welding shall be good and there should not be any lumps and
splatters on the panel”.
xxviii) All the gasket shall be of chemically treated neoprene.
xxix)
Hole & Pin locking (Check nut) arrangement should also be provided while
fixing the vacuum interrupter at bottom side.
1.3.4 VACUUM CIRCUIT BREAKER :
The three phase vacuum circuit breakers will have
three interrupters (one
interrupter per phase) mounted on same carriage.
interrupters shall be air
The
insulated in epoxy resin tank or with epoxy resin phase barriers. Each interrupter
shall have fixed and moving contacts in sealed envelope having vacuum below
10-6 torr. The metallic bellow shall permit axial movement of moving contact and
act as vacuum seal. The contacts shall
good
electrical
and
thermal
have requisite
conductivity
and
shall
mechanical strength and
be
made
of
copper
chromium alloy. Complete literature of vacuum bottles shall be furnished with the
tender.
The vacuum interrupter should be housed in epoxy pole unit and make of Vacuum
Interrupter should be BEL, CGL, SIEMENS, ABB & ALSTOM /AREVA, MEGAWIN only.
1.4
VOLTAGE TRANSFORMERS :
1. Highest equipment voltage
2. No. of phases
3. Insulation level
a) Impulse withstand voltage
b) One minute power frequency
:
:
36 KV
3
:
170 KVP
TN-01/8
withstand voltage on :
i) Primary winding
ii) Secondary winding
4. Frequency
5. Transformation ratio
6. Rated output
7. Accuracy class
8. Winding connection
9. Rated voltage factor
:
:
:
:
:
:
:
:
10.Type of insulation
:
70 KV rms
2 KV rms
50 Hz.
33000/110 V
30 VA / phase
0.5
Star/Star
1.2 continuous and 1.5 for 30
seconds
Resin cast
VTs shall be provided with HRC type fuses on the secondary side. The VT fuses
on primary side shall also be provided with all safety precautions. One of the
secondary terminals of the VTs shall be solidly earthed. The panel shall be provided
with draw out of 3 Nos. Single Phase Voltage Transformers.
1.5
CURRENT TRANSFORMERS :
1. Rated voltage
2. Insulation level
a) Impulse withstand
voltage
b) One minute power
frequency voltage on
i) Primary winding
ii)Secondary winding
3. Frequency
4.
Rated continuous thermal
5. Short time thermal rating
6. Transformer CTs of ratio
7. Rated output/accuracy etc. for CTs.
8.
9.
:
36 KV
:
170 KVP
:
:
:
:
:
:
70 KV rms
03 KV rms
50 Hz
120% of rated primary current
25 KA for 3 Sec.
400-200/5-5A.
a) Rated output
However VA burden
should not be less than suitable for
A.C. series trip requirement with
shunt trip arrangement.
b) Class of accuracy
c) Accuracy limit factor
d) Purpose
Max. instrument security
factor
Type of Insulation
Resin Cast
Core-I
30 VA
5P
15
Relaying
-
Core-II
15 VA
0.5 S
Metering
5
36 KV current transformers shall be single phase. The core shall be of high grade
non ageing laminated silicon steel of low hysteresis loss and high permeability to
ensure high accuracy for both normal and fault current.
1.6
The rating of secondary winding shall be 5
Amps.
However, the current
transformers will have to satisfy the requirement of rated VA burden, class of
accuracy,
accuracy limit factor and short time
specified in clause No. 3.5 at
thermal rating
all transformation
as have been
ratio. Magnetization curves
corresponding to all secondary taps must be submitted with the tender.
The ratings of current transformers of all classes regarding ratio error, knee
point voltage, resistance of secondary winding etc. shall have to be co-ordinated
with
the
requirements of protective
any extra cost.
TN-01/9
relays
and protection scheme, without
1.7
Before commencement of supplies one No. panel with circuit breaker, VT etc. will
have to
be subjected to temperature rise test without extra charges in
the
presence of our Inspecting Officer.
1.8
The
tenderer shall also
arrangement,
furnish
schematic
and
along with
the tender,
complete
outline diagrams indicating
arrangement and position of current transformers, voltage
blocks etc. Type of current transformer and voltage
general
the mounting
transformer
terminal
transformer employed shall
also be clearly stated.
1.9
INDICATING AND INTEGRATING METERS/INSTRUMENTS :
1.9.1 All indicating instruments shall be of switchboard type, back connected, suitable for
flush mounting and provided
with dust and vermin proof cases for tropical use
and finished in suitable colour. All instruments shall
means for adjustment of
have
practical laboratory
accuracy. Only analog type indicating instruments
shall be acceptable. The limits of errors for ammeters/voltmeters shall be those
permissible for class 1.0 or better instruments as per IS:1248. The ammeters
and voltmeters shall be suitably scaled to indicate the current/voltage for all
the rating of current/voltage transformers. A phase selector switch with four/six
position shall be used
meters shall
to
be located
measure
at
eye
the current/voltage of each phase/line. The
level
to
facilitate
observation
of readings
correctly.
1.9.2 A.C. Static HT Trivector Meter :
3
phase
4 wire A.C. Static H.T. Trivector
meter
of accuracy
class
0.5S for
measurement of energy as per latest specification of JVVNL with DLMS protocol,
shall be provided on each Outdoor VCB Kiosks.
Following makes of HT TVMs are acceptable:
i) Secure
ii) L&T
iii) ABB/Elster
iv) Schlumberger
v) Genus Infra
Any other make being procured by Nigam shall also be acceptable.
1.10 RELAYS :
The circuit breaker shall be fitted with shunt trip coil for operation on Numerical
Over Current and Earth Fault relay. The coils should be rated for 110VDC operation
on station battery.
Three phase protection relays shall be Numerical Over-current & Earth Fault
protection having 3 element for over current and one for earth fault protection with
instant trip. The setting for over-current shall be 50-200% (continuous range) and
for earth fault element from 5 to 80% (continuous range).
These relays shall be
non directional with selectable curve for all standard IDMT curves. The numerical
relays shall have following features:i.
Self Diagnosis
ii.
Minimum last five abnormal events recording (over current & earth fault)
indicating fault current and phase, along with Date & Time.
TN-01/10
iii.
On-line display of current.
iv.
Communicable with open Protocol having RS-485 port.
v.
Instantaneous Over-Current Protection with adjustable timer.
vi.
Breaker Failure detection.
vii.
In-built Circuit Breaker Trip Circuit Supervision function during pre closing
and post closing of Circuit Breaker.
viii.
DC supervision.
ix.
Very low burden on CT (less than 0.5VA)
x.
Continuous
monitoring
of
module’s
internal
hardware
and
alarm
generation in case of failure of any critical components.
xi.
5 Digital Output contacts for local alarm as well as tele-signalling.
The relay shall be numerical type mounted in flush pattern on the panel board. The
relay should be rated for 5 Amp. CT secondary.
The relay should conform to
relevant ISS. The tenders shall furnish the detail in this regard along with the offer.
All the relays shall be provided with test blocks in panel so designed that the relays
may be tested in situ. The relays should have provision of testing either through
test block or test plug easily accessible by injecting the voltage / current/frequency
(as
applicable)
from
external
testing
instruments
/source
without
first
disconnecting/ reenergizing the primary electrical circuit protected by the relays.
Facilities for isolating the tripping circuit during such testing shall also be provided.
Relay TTB shall have trip bypass arrangement.
The requirement of test block shall not be applicable in case of drawout type relays
which can be tested by using test plug without removing the relay from its casing.
The testing facilities provided in the relays shall be specifically stated in the bid.
One test plug with five panels or part thereof are to be supplied.
The Following makes of Relays are acceptable:a. Areva.
f. JVS
b. ABB.
g. SEL
c. Easun Reyrolle
h. ASHIDA
d. C&S
i. MEGAWIN
e. Crompton
j. Stelmec
The technical suitability of relays/schemes may also be examined by Protection
Wing & acceptability will be judged appropriately.
The successful bidder must furnish type test reports as per relevant ISS/ IEC along
with bid to suit the environmental conditions of our State, in respect of the relay
(of the type and
design
offered)
which should have been type tested in NABL
accredited test laboratory in respect of such tests for which the lab has been
accredited (for Indian make Relays)/ CPRI/ Nationally accredited testing laboratory
(for Foreign make Relays). These type test reports should not be older than five
years from the date of opening of bid.
Bids without Type Test reports will be
treated as Non-Responsive. Any other equivalent make of relays shall also be
acceptable subject to prior approval of S.E. (JCC), JVVNL, Jaipur.
TN-01/11
1.11
WIRING :
All wiring shall be of switch board type consisting of copper conductor of 1.5 Sq.
mm. for alarm / annunciation / control circuits and 2.5 Sq.mm. for CT and all other
Circuits insulated with polyvinyl chloride insulation suitable for 660 Volt
and
in accordance
with
relevant
service
IS:732. Polyvinyl Chloride used shall have
excellent resistance against burning, moisture, oil and vermin and shall be finished
with clear colour.
shall
furnish
Rubber insulated wiring shall not be acceptable. Tenderers
the details
of
method being adopted by them
for
Joint/
Connections.
All instruments and Panel wiring shall be of heat resisting and self extinguishing
type in compliance with IS.
Plastic
or
porcelain
cleats
of
the
limited
compression type shall be used for holding wiring runs. All wires shall be suitable
for bending to meet the terminal studs
at right angles. Metal cases of all
apparatus mounted on panels shall be separately earthed by means of copper wire
or strips. The following colour scheme of the wiring shall be used as per IS:375.
a)
AC three phase circuits :
i) No.1 Phase
No.2 Phase
No.3 Phase
ii) Neutral Conductor
iii) Connection to Earth
b) D.C. circuits
1.12 MIMIC DIAGRAM :
:
:
:
:
:
:
Red.
Yellow.
Blue
Black
Green
Grey
For indoor panels painted colour bands shall be used for the mimic bus. The mimic
diagram shall be on eye
level.
Equipments
such
voltage transformers etc. shall be represented by
as
current
transformers,
suitable symbols. The colour
shall be Red Shade 537 of IS-5.
1.13 INDICATING LEDs:
Indicating LEDs shall be provided on the control board to indicate the following:
1. Visual indication of ON and OFF position of each circuit breaker.
2. Trip circuit healthy indication.
3. Auto trip indication for each circuit breaker panel.
4. VT supply indication.
Each lamp body shall be of moulded insulation and shall be able to withstand a
high voltage test of
appropriate
value.
All LEDs shall be suitable for 240 V AC
supply and shall have low power consumption and shall provide a wide
illumination of sufficient intensity
angle of
for comfortable viewing. A glass of appropriate
colour shall be screwed into the front of the LED. The design of LED shall be such
as to
facilitate replacement of defective LEDs. An engraved label indicating the
purpose of the LED shall be provided with each LED.
1.14 TEST TERMINAL BLOCKS :
Two nos. test terminal blocks shall be provided one for testing of relays and other
for testing meters. They shall be of switch board, back connected type for front of
panel
mounting.
The
test
blocks
shall
provide complete isolation of meters,
instruments, etc. and the arrangement shall be such that testing power could be
TN-01/12
connected at the test block from any external source
or may be taken from the
instrument transformers. Provision shall be made for short circuiting current
transformers. Suitable
sealing arrangement shall be provided
in
test terminal
blocks.
1.15 FERRULES :
Ferrules
engraved/printed
with
the same
number,
letters
or symbols
as
indicated in the connection and wiring diagram shall be provided on the terminal
ends
of
all wires for identification of circuits for inspection
and maintenance.
Ferrules shall be of strong and flexible insulating material with glossy finish to
prevent adhesion. They shall be engraved / printed and clearly marked and shall
not be effected by dampness. Ferrule numbering
shall be in accordance with
IS:375. The same ferrule number shall not be used on wires in different circuits
on a panel.
1.16 SPACE FOR CABLES AND CABLE GLANDS :
Sufficient space for receiving the cables inside the switch board at the bottom of
the cubicles and mounting arrangement for the terminal cable glands shall be
provided.
Cable gland plates should be above the ground level for the ease of
working.
1.17
PAINTING & FINISHING:
All interiors and exteriors of switchgear enclosure, breaker mechanism etc shall be
finished and painted to produce a neat, fire resistant and durable surface which
would prevent rusting and corrosion. Sheet metal component shall be pre-treated
using 7 tank phosphating process consisting of de-greasing, acid pickling, derusting, phosphating and passivation including repeated rinsing in between. On
completion of the passivation of the components, they shall be preheated and then
epoxy powder coated or treated with one coat of primer & zinc chromate and
finished with two coats of light gray enamel paint of shade 631 of IS 5 and stoved to
achieve excellent anti-rusting and scratch resistant properties. The thickness of
painting shall be around 60 microns.
1.18 SCHEDULE OF REQUIREMENTS :
The
requirement
of circuit breakers shall be
as
per Clause No. 3.31.
At a
particular substation one or two transformers can be controlled through one breaker
depending upon
the
necessity. Each of these breakers shall be equipped as per
clause No. 3.19.
1.19 SCHEDULE OF EQUIPMENT :
Item No. 1 (TRANSFORMER TYPE)
36KV/800 Amp. VCB Switchgear panel for indoor installation:
1. 36KV/800A Vacuum Circuit Breaker
1 No.
drawout type with provisions of manual tripping by
means of a control switch/push button.
2. Motor Charged Spring operated closing
mechanism.
TN-01/13
1 No.
3.
Numerical 3 0/C + E/F relay
1 No.
4.
Single phase 36 KV current transformers
3 Nos.
of ratio 400-200/5-5A suitable for metering
and protection. The class of accuracy shall
be 0.5 S for metering and 5P15 for protection.
Rated burden (output) shall be 30 VA
for protection & 15 VA for metering
for
each secondary
core.
Instrument
security factor for metering core shall not
exceed 5.
5. Flush type switchboard mounting pattern
1 No.
Analog voltmeter of class 1.0 or better accuracy
suitable for 110 V phase to phase secondary
scaled for 0-40 KV.
6.
Voltmeter phase selector
switch
to
1 No.
indicate phase to phase and phase to neutral
voltage of all the three phases.
7. Indicating LEDs coloured red, amber and
3 Nos.
blue for PT supply indication.
8. Arrangement for reception of incoming and
2 Nos.
outgoing cable connection along with cable
termination and sealing kits for 3 C x 400 mm
sq. XLPE power cables.
9. Set of three phase air insulated main
electrolytic copper bus bars of 800A continuous
current rating having maximum current density
1.5 Amp./ Sq. & minimum cross sectional area
720mm Sq. with PVC insulation or sleeves. STC
rating 25KA for 3 seconds.
The busses within the cubical shall be of high
conductivity electrolyte grade copper. The Bus
bar joints shall be silver plated and bolted in such
a manner that initial contact pressure around the
square headed high tensile bolt will remain
substantially undiminished at all temperature
upto
rated full load temperature. The Bus
support and bushings shall be of epoxy resin cast
type. All drop off from main bus to VCB and VCB
to bushing terminations shall be suitable for
current rating of circuit breaker . All the bus bar
shall be sleeved with heat shrinkable sleeves of
36 KV voltage level (Insulated for a service
TN-01/14
1 No.
voltage of 36 KV) and bus bar shall be shrouded
wherever possible. All the bus bar joints shall be
shrouded and where shrouding is not possible, it
shall be taped with HV self amalgamation tape.
All the tap off bus bar connections inside panel
and PT jumpers shall be sleeved with HT heat
shrinkable sleeves. Special care shall be taken in
the design of bus bar system to provide for
thermal expansion and to minimize the chances
of bus fault. Bimetallic washers shall be provided
at the joints of two different metal surfaces.
The bus supports and bushings shall be non
hygroscopic non aging glass reinforced polymer.
10. Mechanical ON/OFF indicator.
1 No.
11. Operating handle for independent manual
1 No.
closing mechanism.
12. Red indicating LED for ON indication.
1 No.
13. Green indicating LED for OFF indication.
1 No.
14. Auxiliary switch having minimum of 8
1 No.
contacts 8 normally open and 8 normally
closed.
15. Flush mounting pattern analog ammeter of class
1 No.
1.0 accuracy or better for 5 Amps. CT
secondary scale 0-200/400 A.
16. Ammeter selector switch to indicate phase
1 No.
current in all three phases and with OFF
position.
17. AC HT Tri vector meter
1 No.
18. Auxiliary Relay type VAA 33 or equivalent
2 Nos.
For transformer protection functions.
19. Trip Circuit Supervision Relay
1 No.
20. D.C. Supervision Relay
1 No.
21. Annunciator 16 window
1 No.
22. High Speed Trip Relay
1 No.
23. Semaphore indicators
As per requirement
24. Three Position control switch for circuit
1 No.
Breaker & Annunciation window
26. Automatic door CFL with Switch.
1 No.
27. 240V,
2 Nos.
80W
AC
single
phase
anti condensation heaters with thermostat
(0-60 eg. C) and switch.
28. Anti pumping contactor.
1 No.
TN-01/15
29. Operation Counter.
1 No.
30. Test terminal blocks for metering and
2 Nos.
relays, 3 phase 4 wire.
31. Fault trip yellow LED.
1 No.
32.Ground bus system, size 50x6mm copper
1 No.
may be provided and the earthing stud
shall be capable of withstanding rated
short
circuit current and stud design
shall be as per IS-133427 or IEC -200.
33. Bell for Alarm
1 No.
34. Hooter for Alarm
1 No.
35. 3 Pin Socket with switch
1 No.
36. 2 Pin Socket with switch
1 No.
37. Auto Trip Lamp
1 No.
Item No. 2 (FEEDER TYPE)
36KV/800 Amp. VCB Switchgear panel for indoor installation:
1. 36KV/800A Vacuum Circuit Breaker
1 No.
drawout type with provisions of manual tripping by
means of a control switch/push button.
2. Motor Charged Spring operated closing
1 No.
mechanism.
3.
Numerical 3 0/C + E/F relay
1 No.
4. Single phase 36 KV current transformers
3 Nos.
of ratio 400-200/5-5A suitable for metering
and protection. The class of accuracy shall
be 0.5 S for metering and 5P15 for protection.
Rated burden (output) shall be 30 VA
for protection & 15 VA for metering
for
each secondary
core.
Instrument
security factor for metering core shall not
exceed 5.
5. 33000/110 Volts three single phase voltage
transformers
1 Set
having 30 VA/phase burden
and class of accuracy 0.5. The transformer shall
be star-star connected.
6. Flush type switchboard mounting pattern
1 No.
Analog voltmeter of class 1.0 or better accuracy
suitable for 110 V phase to phase secondary
scaled for 0-40 KV.
7.
Voltmeter phase selector
switch
to
indicate phase to phase and phase to neutral
voltage of all the three phases.
TN-01/16
1 No.
8. Indicating LEDs coloured red, amber and
3 Nos.
blue for PT supply indication.
9. Arrangement for reception of incoming and
2 Nos.
outgoing cable connection along with cable
termination and sealing kits for 3 C x 400 mm
sq. XLPE power cables.
10.Set of three phase air insulated main
1 No.
electrolytic copper bus bars of 800A continuous
current rating having maximum current density
1.5 Amp./ Sq. & minimum cross sectional area
720mm Sq. with PVC insulation or sleeves. STC
rating 25KA for 3 seconds.
The busses within the cubical shall be of high
conductivity electrolyte grade copper. The Bus
bar joints shall be silver plated and bolted in such
a manner that initial contact pressure around the
square headed high tensile bolt will remain
substantially undiminished at all temperature
upto
rated full load temperature. The Bus
support and bushings shall be of epoxy resin cast
type. All drop off from main bus to VCB and VCB
to bushing terminations shall be suitable for
current rating of circuit breaker . All the bus bar
shall be sleeved with heat shrinkable sleeves of
36 KV voltage level (Insulated for a service
voltage of 36 KV) and bus bar shall be shrouded
wherever possible. All the bus bar joints shall be
shrouded and where shrouding is not possible, it
shall be taped with HV self amalgamation tape.
All the tap off bus bar connections inside panel
and PT jumpers shall be sleeved with HT heat
shrinkable sleeves. Special care shall be taken in
the design of bus bar system to provide for
thermal expansion and to minimize the chances
of bus fault. Bimetallic washers shall be provide
at the joints of two different metal surfaces.
The bus supports and bushings shall be non
hygroscopic non aging glass reinforced polymer.
11. Mechanical ON/OFF indicator.
1 No.
12. Operating handle for independent manual
1 No.
closing mechanism.
13. Red indicating LED for ON indication.
TN-01/17
1 No.
14. Green indicating LED for OFF indication.
1 No.
15. Auxiliary switch having minimum of 8
1 No.
contacts 8 normally open and 8 normally
closed.
16. Trip Circuit Supervision Relay
1 No.
17. D.C. Supervision Relay
1 No.
18. Annunciator 8 window
1 No.
19. High Speed Trip Relay
1 No.
20. Semaphore indicators
As per requirement
21. Three Position control switch for circuit
1 No.
Breaker & Annunciation window
22. Flush mounting pattern Analog ammeter of class
1 No.
1.0 accuracy or better for 5 Amps. CT
secondary scale 0-200/400 A.
23. Ammeter selector switch to indicate phase
1 No.
current in all three phases and with OFF
position.
24. AC HT Tri vector meter
1 No.
25. Automatic door CFL with Switch.
1 No.
26.
2 Nos.
240V,
80W
AC
single
phase
anti condensation heaters with thermostat
(0-60 Deg. C) and switch.
27. Anti pumping contactor.
1 No.
28. Operation Counter.
1 No.
29. Test terminal blocks for metering and
2 Nos.
relays, 3 phase 4 wire.
30. Fault trip yellow LED.
1 No.
31.Ground bus system, size 50x6mm copper
1 No.
may be provided and the earthing stud
shall be capable of withstanding rated
short circuit current and stud design shall
be as per IS-133427 or IEC -200.
1.20
32. Bell for Alarm
1 No.
33. Hooter for Alarm
1 No.
34. 3 Pin Socket with switch
1 No.
35. 2 Pin Socket with switch
1 No.
36. Auto Trip Lamp
1 No.
All equipment’s shall be complete in all respect. All
apparatus which
usual/necessary for
may
fittings,
accessories or
not have been mentioned above but which are
the equipment’s shall be included for
panel.
1.21 OPERATING AND MAINTENANCE INSTRUCTIONS :
TN-01/18
each
circuit breaker
The successful
immediately
tenderers, on receipt
20
sets
of
the
of
order
erection/operating
shall arrange
to
dispatch
and maintenance instruction
manuals along with the requisite drawings of the equipment’s covered by this
specification to this office for approval. Two sets of these, one set in English and
one in
Hindi
will
also
be
forwarded
to
the
consignee along with each
equipment.
1.22 TEMPERATURE RISE :
The maximum temperature rise of various parts of the circuit breakers when
tested
under
rated
ambient temperature
conditions shall not exceed the specified values at a peak
of 50 deg. c. The breakers may be
plated contacts if necessary to
meet
provided with
the requirement of IS:13118 where higher
temperature rise is permitted with silver plating contacts. The quantity
facing shall be such that after carrying out
operations
specified
for the
silver
one tenth
of silver
of the total number of
mechanical endurance test, there is still continuous
layer of silver on the contacts. The temperature rise of CTs and PTs shall also not
exceed the permissible values as per relevant Indian Standards when corrected for
max. ambient temperature at site.
1.23 NAME/RATING PLATE :
All items of equipment included in this specification shall be provided with rating
plates as per relevant standards and in addition with following particulars:Name & Address of Supplier
Telephone No.
Fax No.
Date of Despatch
Date of Expiry of
Warranty
Name of Purchaser
TN No.
:
:
:
:
:
:
:
It will be mandatory for the supplier to punch TN No., Sr. No. & Make on
two positions of the circuit breaker panel.
1.24 INSPECTION AND TESTING :
1.24.1 Each equipment
shall
comply with and shall be subjected to all routine and
acceptance tests prescribed in the relevant Indian Standard Specification/IEC.
1.24.2 TEST OF 36KV INDOOR CIRCUIT BREAKER :
i)
ROUTINE/ACCEPTANCE TESTS:
The following acceptance and routine tests shall be got conducted in presence of
purchaser's representative
as
per stipulation of the relevant standards, on each
unit.
a)
One minute power frequency voltage withstand dry test on main circuit.
b)
Voltage withstand test on control & auxiliary circuits.
c)
Measurement of insulation resistance of main circuit.
d)
Mechanical operation test.
e)
Design and visual checks.
f)
Any other tests not specified above but covered as
edition of relevant IS/IEC.
TN-01/19
per amendment/ latest
ii)
Inspection & tests on control gear :
In addition to the above tests at 3.23.2(i) above specified by IEC, the following shall
also be performed at manufacturer’s works in the presence of purchaser’s
representative after completely assembling the kiosk.
a)
Checking wiring of circuits and their contacts.
b)
Insulation resistance of complete wiring, circuit by circuit with all equipment
mounted on the panels.
c)
Checking and operational protective schedule and instruments meters.
d)
Checking of phase faults between R&Y, Y&B and B&R phases.
Breaker
should trip under all three conditions.
iii)
Temperature Rise test on One No. Breaker in the first offered lot shall also
be done in the presence of the purchaser’s representative.
iv)
TYPE
TESTS
CONDUCTED ON MATERIAL AS
PER
RELEVANT
STANDARDS :
a)
Dielectric tests.
i) Lightning Impulse Voltage Test.
ii) One Minute Power Frequency Test(Wet & Dry).
b)
Short time with stand current and peak withstand current test.
c)
Basic short circuit duties test.
d)
Single phase short circuit test.
e)
Mechanical Operation Test as per M-2 class.
f)
Out of phase making & breaking test.
g)
Capacitive Current Switching Test.
i) Cable Charging Test.
ii) Single Capacitor Bank Current Switching Test.
h)
Measurement of insulation resistance of main circuit.
i)
Temperature rise test.
j)
IP-5X test (for cubicle/control cabinet).
k)
Any other type tests not specified above but covered as per amendment /
latest edition of relevant IS/IEC
Where permitted in the relevant standard, a test specimen for type test may be a
representative sub-assembly/ a representative functional unit. An individual type
test is acceptable for a change of constructional detail, for any change in the
design/type
of
type
test
report
and
the
design/type
offered
against
this
specification, if the manufacturer can demonstrate and purchaser is satisfied that
this change does not influence the result of the individual type test. The bidder may
bring out in offer all such changes made in components, materials, design etc. as
the case may be. The purchaser will interpret the meanings of drawings and
specifications and shall have the power to accept/reject any type test which in his
judgment is/is not in a manner acceptable to him. The decision of Purchase
Committee in this matter shall be final and binding to all.”
3.24.3 The
type
test
reports
of
Circuit
Breakers,
Current
Transformers, Relays, meters etc. shall be complete
Transformers,
in all respect
Potential
along with
oscillographic records, photographs etc. in respect of all type tests as per relevant
ISS/IEC.
TN-01/20
The type test certificates should be in respect of specific make and type / rating
of
the
and
Circuit
not
Breakers/ instruments, transformers etc. intended to be supplied
in respect
of
the
breakers etc.
manufactured
by
their foreign
collaborators if any.
3.24.4 Routine & acceptance test as per relevant standard shall be carried out on each
equipment
covered
by
this
specification in the presence
of
purchaser's
representative. If so desired by the purchaser all test reports shall be submitted
and got approved from the purchaser
before
dispatch
of
the
equipment.
Before commencement of supplies one panel complete with Circuit Breaker, VT etc.
will be subjected to temperature rise test in the presence of our Inspecting Officer.
3.24.5 INSPECTION AND TESTS OF CONTROL GEAR :
All the tests (as mentioned at Clause 3.23.2(i)) and Inspection shall be made
at the
bidder
place
of
manufacturer
unless otherwise especially agreed upon by
and purchaser at the time of purchase. The bidder shall
inspection officer(s) representing the
purchaser
all
the
afford the
reasonable facilities without
charges, to satisfy him that the material is being furnished in accordance with
this
specification. The purchaser has the right to have the tests carried out at
his own cost by an independent agency whenever there is a dispute regarding
the quality of
supply.
The Inspection may be carried out by the
purchaser at
any
stage
of
manufacture/ before dispatch as per relevant standard.
Inspection and acceptance of any material under the specification
purchaser, shall not relieve the bidder
by
the
of his obligation of furnishing material
in accordance with the specification and shall not prevent subsequent rejection
if the material is found to be defective. The Bidder shall keep the purchaser
informed in
advance, about manufacturing programme so that arrangements can
be made for inspection.
The purchaser reserves the right to insist for witnessing the acceptance/ routine
testing of the bought out items.
The Bidder shall give 15 days advance intimation to enable the purchaser to depute
his representative for witnessing the acceptance and routine tests.
3.25
INTER CHANGEABILITY :
All
similar materials and removable parts
of
similar equipments shall be inter
changeable with each other.
3.26
TITLE PLATES:
A Title plate bearing the name & purpose of each panel shall be fixed on the top of
each indoor panel.
3.27
FAULT / TROUBLE ALARM SCHEME :
The automatic trip of the Circuit Breaker due to operation of protection relays shall
be indicated by sounding of a hooter. All non-trip alarms shall be indicated by an
alarm bell.
TN-01/21
3.28
MAKE AND TYPE OF BOUGHT OUT ITEMS :
3.32.1 The following make of bought out items will be acceptable to department :
------------------------------------------------------------------------------------------------S.No. Name of Item
Make
------------------------------------------------------------------------------------------------1.
Indicating Instrument
AE/IMP/MECO
(Analog type)
2.
Indicating Instrument
AE/IMP/MECO
(Digital type)
3.
Control Switch for Circuit
ALSTOM/RECOM/SWITRON/
Breaker/Trip Transfer.
KAYCEE
4.
Selector Switch for
Voltmeter/Ammeter
SWITRON/KAYCEE/RECOM
5.
Semaphore Indicator
ALSTOM/DAV IND./ER
6.
Indicating Lamp
ALSTOM/TEKNIC/
VAISHNO/DAV
7.
Annaunciator
MINILEC/YESHMUN/
INSTALRAM/PROTON/
JVS/PRADEEP/ALAN
8.
Push Button
TEKNIC/VAISHNO/ESSEN
9.
A.C. Hooter/Bell
TARGET/INDUSTRIAL
HOOTER/ALAN/JVS
10.
D.C. Hooter
TARGET/INDUSTRIAL
HOOTER/ALAN/JVS
11.
12.
13.
14.
15.
Heater
SOFIA/ELTER/AIREX/KAYCEE
Link Type test terminal
block for testing of TVM
CFL Tube
IMP/CAPITAL
PHILIPS/CROMPTON/BAJAJ
2 Pin/3 Pin socket with
Switch (5/15A)
Relays
ISI MARK
Areva/ABB/Easun Reyrolle/ C&S
JVS/SEL/ASHIDA/MEGAWIN
16.
HT TVM
Secure/L&T/ABB/Elster/Schlumberger
Other makes shall also acceptable if it is of "ISI MARK" or type tested for which
tenderers shall furnish attested photo state copies of ISI Certificate/type test
report not older than 5 years for the respective make offered with the prior
approval of SE(MM) JVVNL, Jaipur.
3.32.2 Make / type of each relay, indicating
control
switches,
instruments, integrating
selector switches,
indicating
lamps,
indicators, enunciator scheme, bell, hooter etc. shall be clearly
instruments,
semaphore
and invariably
indicated in the GTP (Guaranteed Technical Particulars), bill of material and unit
price list.
Only specific
"EQUIVALENT/REPUTED
make
MAKE"
accessories shall be indicated.
will
not
TN-01/22
be
given
The
for consideration.
word
3.33
BILL OF MATERIAL :
The firm shall furnish the bill of material for Indoor VCB Panel separately.
3.35
Desirable Features Required for Safety and Smooth functioning of the
Circuit Breaker:
As these breakers are to be installed inside the control room therefore the features
related with the operators safety is of the paramount importance.
A) Vacuum Circuit Breaker :
i)
The VCB shall be totally drawn out type with racking gears with distinct test &
service positions. The contact wipe shall be independent of the manual
intervention.
ii)
The movement of VCB shall be duly interlocked so that it can not be racked in to
service position in pre closed condition & it is not possible to rack out from
service position in pre closed condition. Any attempt to close the VCB into
intermediate position shall be blocked by sustained mechanical tripped command
overriding on to the mechanism to avoid closure of the contacts of VCB. Any
attempt to cause the movement of VCB shall initiate the tripping of a VCB and
only thereafter the movement shall be facilitated.
iii) The mechanism shall be trip free type with inherent capability of O-CO operation.
iv) The Auxiliary switch shall be 8 N/O + 8 NC contacts.
v)
keeping in view on unmanned substation and grid complexity, the rated operating
sequence shall be of rapid auto-reclosing duty as O-0.3sec-CO-3min-CO.
vi) In view of frequent operations encountered in the distribution system, it is highly
beneficial to Nigam to opt for M2 Class mechanism (suitable for 10000
mechanical endurance operations as per latest IEC-62271-100) as against M1
Class mechanism (suitable for 2000 mechanical endurance operations) which will
give long trouble free performance, thus saving huge life cycle costs in terms of
maintenance and man power cost.
vii) The Circuit Breaker should be design in such a manner that there should be
proper metal compartmentalization of the various circuit breaker parts such as
breaker chamber, Bus bar chamber & Cable chamber.
viii) Test and service position limit switches shall be provided.
ix) The provision is made to avoid accidental contact & access to the high electrically
stressed area by providing appropriate touch to safe metal screens when the VCB
is posed into service position inside the cubical.
x)
No separate VCB handling trolley shall be required to insert the VCB inside the
panel. The VCB shall be floor rolling type.
xi) The VCB is provided with proper interlock for the secondary isolating plug &
socket type contacts so that it is not possible to insert the VCB from the test to
service position unless the secondary plug socket is connected & it is not possible
to remove the secondary plug socket into intermediate position & in service
TN-01/23
position. This interlock as per IEC 60298 is an inherent part of the VCB & panel
design.
xii) The vacuum interrupter is housed into epoxy pole unit to have better
environmental protection & safe operation under the fatal conditions. The bellow
for the VI shall be of stainless steel.
xiii) The insulation used shall be non hygroscopic & non deformable type and it is free
from any partial discharges when exposed to sustain over voltages.
xiv) The VCB shall be completely type tested as IEC 62271-100/200 or ISS
xv) The VCB shall be Tested for E2, M2, C2 test duties.
1. B) VCB Panel features :
i)
The panel shall be totally dust and vermin proof & has degree of protection –
IP5X.
ii)
The operating instruments like switches etc shall be placed at height less
than 1900mm.
iii)
The total height of the panel should not exceed more than 2700mm and
width 1200mm.
iv)
The panel is designed totally on air clearances basis with no dependency on
the external shrouds & add on insulations.
v)
The panel shall have epoxy spout insulators between the bus bar & VCB
chamber to have proper compartmentalization.
vi)
The bus risers shall be epoxy coated and is integral part of the spout
bushings.
vii)
Entire bus bar compartment is provided with solid insulation scheme to have
less dependency on the inter phase barriers.
viii)
The panel shall have rigid sheet steel construction for better stability and
shall be self standing without the external bracings. The sheet thickness
should not less than 3mm.
ix)
The panel is designed to have gravity operated self resetting type pressure
relief flaps to have internal arc fault proof design.
x)
The panel is having integral foundation frame.
xi)
The CT’s shall be top terminal CT’s and mounted on the panel base frame to
facilitate easy mounting and sevicibilty.
xii)
Adequate cable termination space of around 700mm shall be provided with
facility to terminate 3 cables of 3CX400 sq. mm size.
xiii)
Panel is provided with independently operating insulated type non metallic
shutters with pad locking facility. The shutters shall automatically operate
with the VCB trolley movement.
xiv)
The panel shall be provided with draw out type of 3 No. single phase PT’s.
xv)
The multi-core cable entry can be provided optimally from front or rear side
of the panel. Cable entry from LH/RH side through self standing side cable
boxes.
TN-01/24
Desirable Features for Relay :
i)
Numerical 3 over current and Earth fault relay with instant trip.
ii)
Instantaneous Over-Current Protection with adjustable timer.
iii)
Breaker Failure detection.
iv)
In-built CB Trip Circuit Supervision function during pre closing and post
closing of CB.
v)
DC supervision.
vi)
Disturbance Recorder. Up 1 sec of actual waveform of current along with
logical and physical status, are captured & saved in the built-in memory with
date time stamping, for analyzing fault condition & fault location.
vii)
Fully communicable with IEC standard open protocol.
viii)
Separate Communication Port for SCADA (RS485) as well as Local testing
(RS232C)
ix)
Very low burden on CT (less than 0.5VA)
x)
Continuous monitoring of module’s internal hardware and alarm generation
in case of failure of any critical components.
xi)
Facility to synchronized Relay time from SCADA
xii)
5 Digital Output contacts for local alarm as well as tele-signalling.
TN-01/25
TECHNICAL SPECIFICATION FOR 36 KV OUTDOOR
VACUUM CIRCUIT BREAKERS
1.
SCOPE :
This specification is intended to cover the design, manufacture, assembly, testing
at manufacturer's works, supply, delivery, installation & commissioning of 36 KV
Outdoor Vacuum Circuit Breakers Complete with all materials and accessories for
efficient and trouble
1.1
It
free operation.
is not the intent to specify completely
herein
all
details of the design and
construction of equipment’s. However, the equipment shall conform in all respects to
high standards of engineering, design and workmanship and shall be capable of
performing in continuous commercial operation upto the
Bidder's guarantee
in
a
manner acceptable to the Purchaser, who will interpret the meanings of drawings
and specifications and shall have the power to reject any work or material which
in
his judgment is not in accordance therewith. The offered equipment shall
complete
with
all
operation along with
Such components
of
components
necessary
associated
for
its effective
and
trouble
be
free
equipments, interlocks, protection schemes etc.
shall be deemed to be within the scope of supply, irrespective
whether those are specifically brought out
in
this specification and/or the
commercial order or not.
2.0
2.1
STANDARDS :
The
circuit
breaker
shall
conform
to
the
available at the time of testing of relevant
latest
revisions
with amendments
standards, rules and codes, some of
which are listed herein for ready reference:-.
IS:13118/IS-3427/
IS:10118 (Part-III) –
1982/ IS:2165-1977/
IS:3716-1976/ IEC62271-100/ IEC-62271200 (with latest
amendments)
IS: 3156
IS: 2705
IS: 3231
IS:1248
IS:14697-1999
IEC-62053-22-2003
IEC-62052-11-2003
CBIP Technical Report
No.88 revised July, 1996
read with amendment
issued (April,99,
September,99 and also
any other amendment
thereafter).
2.2
Circuit
Breaker/
and control gear.
metal
enclosed
Switchgear
Voltage transformers.
Current transformers.
Electrical Relays for power system.
Meters and Instruments
Specification for AC static transformer operated watt hour
and VAR hour meters class 0.2 S & 0.5 S.
Specification for AC Static Watt hour Meters, class 0.2 S &
0.5 S.
Specification for AC Static Electrical Energy Meter.
Equipment meeting with the requirements of any other authoritative standards,
which ensure equal or better quality than the standard mentioned above shall also
be acceptable. If the equipment offered by the Bidder conforms to any other
standard
adopted and the specific standards shall
TN-01/26
be
clearly brought out in
relevant schedule. Four copies of such
Translations, shall
3.
be
standards with
authentic
English
furnished along with the offer.
CLIMATIC CONDITIONS :
Equipment to be supplied against this specification shall be suitable for satisfactory
continuous operation under the following tropical conditions :i)
Peak ambient air temperature
in shade.
ii) Minimum ambient air temperature
in shade
iii) Maximum relative humidity.
iv) Minimum relative humidity
v)
Dust storms are liable to occur during
the period
vi) Height above mean sea level
vii) Average number of thunder
storm days per annum.
viii) Average annual rainfall
(Depending on area)
ix) Number of months of tropical
monsoon conditions p.a.
Note :
Climate may be moderately hot and humid
fungus growth.
The
ambient conditions.
climatic
50 DEG C
(-) 5 DEG C
95 %
10 %
from March to July
less than 1000M
40 DAYS
10-100 cm
4
tropical conducive to rust and
conditions are also prone to wide variations in
Smoke is also present in the atmosphere.
Heavy lightning
also occurs during June to October.
4.
PRINCIPAL PARAMETERS OF CIRCUIT BREAKERS :
4.1 TYPE AND RATING
4.1.1 Type
36 KV
Vacuum Circuit Breaker
4.1.2 Service
Outdoor
4.1.3 Pole
3
4.1.4 Rated voltage
(nominal/max.)
4.1.5 Rated frequency 50 Hz
33/36 KV
4.1.6 System Neutral
earthing
Effectively
grounded.
4.1.7 INSULTATION LEVEL
4.1.7.1 Impulse withstand voltage
170 KVp
4.1.7.2 One minute power
frequency withstand voltage.
70 KV rms
4.1.8 Rated Current
4.1.8.1 Continuous at 50 C.
1250 A
4.1.8.2 Short time current
for 3 Sec.
4.1.9
25 kA
Rated Breaking Capacity
4.1.9.1 Symmetrical
25 KA
4.1.9.2 Asymmetrical
As per relevant standard
TN-01/27
4.1.10 Rated making capacity
2.5 x 25 KA
4.1.11 Rated short time with
stand current for 3 secs.
25 KA
4.1.12 a) Total break time
b) Total closing time
3 cycles(Max.)
4 cycles (Max.)
4.1.13 Creepage distance
900 mm or more
4.1.14 Mounting.
Steel Pedestal.
4.1.15 Operating duty
For gang operation
O-0.3Sec.-CO-3min-CO
4.1.16 Operating Mechanism
Spring charged
closing mechanism
or magnetic
actuator.
Motor operated
4.1.17 Auxiliary voltage.
110 VDC
4.1.17.1 Spring charging Motor
230V/415V AC
4.1.17.2 Heater/Lamp/Socket.
4.1.18
230V AC
Terminal Connector
4.1.18.1 Type
Alluminium Alloy
Type clamp
suitable for
both horizontal
/vertical take off
Bimetallic/
4.1.18.2 Suitable for
ACSR Conductor
4.2
4.2.1
10% Panther and
90% Dog Conductor
System details
H.V. System
Voltage (Nominal/Max.)
33 KV /36 KV
Phases
4.2.2
3
System Neutral
Effectively earthed.
Fault level
25 KA rms
Auxiliary power Supply
4.2.2.1 A.C. Supply
1. 415 volts 3 ph 4 W 50 Hz
2. 230V 1 Ph 2 W 50 Hz
110 V 2 wire.
4.2.2.2 D.C.Supply
4.3
4.3.1
Symmetrical
Supply point.
Auxiliary power supplies listed above will be made available to each circuit breaker
as below :
AC supply.
Single feeder.
TN-01/28
DC supply.
Single feeder.
4.3.2 Isolating switch fuse unit shall be provided at the circuit breaker for each incoming
supply. For DC supply double pole throw switch shall be provided.
5.
5.1
GENERAL TECHNICAL REQUIREMENTS :
DESIGN CRITERIA :
The 36 KV Outdoor VCBs shall be conforming to M-2 Class. The
used
in
high
voltage
system
having
characteristics
equipment will be
as
listed
in
the
specification. The equipment will be installed outdoor in a hot, humid and tropical
atmosphere.
involving
All equipment, accessories and wiring shall have tropical protection,
special
treatment
of
metal
and insulation against fungus, insects and
corrosion.
The maximum temperature in any part of the equipment at specified
rating shall
not exceed the permissible limits as stipulated in the relevant standards even at
an
ambient temperature of 50 Deg.C.
The equipment shall be capable of withstanding the dynamic
stresses of listed
short
and
thermal
circuit current without any damage or deterioration.
The safety clearances of all live parts of the
equipment shall be as per relevant
standards.
5.2
5.2.1
SPECIFIC REQUIREMENTS :
The
circuit breaker shall be for
outdoor installation, three
pole
vacuum type,
having internal isolation without any sequential interlock.
The duty of the circuit breaker
shall
involve satisfactory interruption of short
circuit currents as listed in the specification.
5.2.2 CONSTRUCTIONAL FEATURE :
Each circuit breaker shall comprise three identical poles, complete with a gang
operated mechanism for specified duty.
All
these
poles
of circuit
breaker
shall
be
linked together electrically and
mechanically for specified duty.
The
circuit breaker units shall be complete
other accessories
and
materials
with operating mechanism and
to ensure complete assembly and proper
functioning. The following features should be ensured:-
a) Hinges of door shall be concealed type to avoid rusting and obstructive
opening of the door. However, in case hinges are made of brass, then same
may or may not be of concealed type.
b) The quality of welding shall be good and there should not be any lumps and
splatters on the panel”.
c) All the connecting bus bar and current carrying parts shall be made of
copper.
d) All the gasket shall be of chemically treated neoprene.
e) Hole & Pin locking (Check nut) arrangement should also be provided while
fixing the vacuum interrupter at bottom side.
TN-01/29
f) The vacuum interrupter should be housed in Epoxy Pole/ Porcelain bushing
units and make of Vacuum Interrupter is required to be from BEL, CGL,
SIEMENS, ABB/ ALSTOM/AREVA/MEGAWIN..
5.2.3 BUS BAR, MAIN CONTACTS AND ARC QUENCHING CHAMBER :
The busses within the cubical shall be of high conductivity electrolyte grade
copper. The Bus bar joints shall be silver plated and bolted in such a manner
that initial contact pressure around the square headed high tensile bolt will
remain substantially undiminished at all temperature upto
rated full load
temperature. The Bus support and bushings shall be of epoxy resin cast type.
All drop off from main bus to VCB and VCB to bushing terminations shall be
suitable for current rating of circuit breaker . All the bus bar shall be sleeved
with heat shrinkable sleeves of 36 KV voltage level (Insulated for a service
voltage of 36 KV) and bus bar shall be shrouded wherever possible. All the bus
bar joints shall be shrouded and where shrouding is not possible, it shall be
taped with HV self amalgamation tape. All the tap off bus bar connections inside
panel and PT jumpers shall be sleeved with HT heat shrinkable sleeves. Special
care shall be taken in the design of bus bar system to provide for thermal
expansion and to minimize the chances of bus fault. Bimetallic washers shall be
provided at the joints of two different metal surfaces.
The
main contacts shall have adequate area
carrying
rated
continuous
and
short
and
time
contact pressure
current
without
for
excessive
heating liable to cause pitting and welding.
The tips of the arcing and main contacts shall be heavily silver plated (Min. 40
microns) or made of copper chromium alloy.
The contacts shall be adjustable to allow for wear, shall be
easily replaceable
and shall have minimum movable parts and adjustments.
The arc quenching device shall be of robust construction and shall not require
any critical,
adjustment.
The
devices shall
be
easily
accessible and
removable for access to the breaker contacts.
5.2.4 AUXILIARY CONTACTS :
Each breaker shall be provided with eight normally open & eight normally closed
electrically separate auxiliary
contacts. These
shall
be
in
addition to those
required for its own operation and indication.
The auxiliary contacts shall be convertible type so that normally
can be converted
into
open
contacts
normally close contact and vice versa at site.
The auxiliary contacts shall be rated 10A at 240V AC and 4A at 110 V DC.
5.2.5 INTERLOCK :
All electrical and mechanical interlocks which
satisfactory
operation
of
are necessary
the circuit breaker shall be furnished.
5.2.6 INSULATOR :
TN-01/30
for
safe and
Insulator shall be wet process porcelain,
brown
blemishes. Metal parts and hardware shall
glazed and
free from all
be hot dip galvanised/ aluminium
anodized.
Insulator shall have adequate mechanical strength and rigidity to withstand the
duty involved.
When operated at maximum system voltage, there shall be no electrical discharge.
Shielding rings, if necessary, shall be provided.
Insulation shall be coordinated with basic impulse
level of the system. The
creepage distance shall correspond to heavily polluted atmosphere.
The bushing shall not be subjected to direct point loading. They shall be provided
with neck around clamps for evenly distributed pressure.
The bushing shall be mounted using suitable clamps and gasket arrangement to
provide required degree of protection.
The bushing assembly shall be provided with lock nut and check nut which will be
non-magnetic and non-corrosive.
The provision shall be kept on roof bushing assembly to adopt arcing horn.
The lifting arrangement shall not cause any effective loss of creepage distance/
phase to earth clearances as specified in the ISS/IEC.
5.2.7 OPERATING MECHANISM :
Operating
mechanism shall be spring operated
with
anti pumping and trip
free features, complete with shunt trip coils. All three breaker poles shall operate
simultaneously. Circuit breakers shall have provision so as to be suitable for three
phase auto reclosing. In case of spring closing mechanism, no main spring of the
mechanism shall be plated, powder coated or given any other treatment, so that
spring property
is
not lost.
The
motor shall be universal type suitable
for
220/240V. Spring Charge Indication Lamp shall be provided.
The
mechanism shall be designed for
electrical
local position. In addition to this, local
control from remote as well as
manual trip button shall be provided.
Operation counter and mechanical ON-OFF indicator shall be provided.
5.2.8 CONTROL CUBICLE :
A
common
monitoring
located
on
control cubicle shall be
devices
and
all
individual poles.
furnished
to
other accessories
The
cubicle
house electricals,
except
controls,
those which must be
shall be IP-55
of
gasketed
weatherproof construction, fabricated from sheet steel minimum 3 mm thick.
The cubicle shall have front access door with lock and keys, and removable gland
plate at the bottom for owner's
cable entry. Thermostat controlled space heater,
internal illumination lamp 3 pin 5 A socket with individual ON-OFF switches shall be
provided in the cubicle.
For local operation following shall be provided :
a)
b)
Local/Remote selector switch.
Trip normal close control switches with pistol grip handle.
TN-01/31
All
electrical, mechanical connections between the control cubicle and individual
poles shall be furnished.
5.2.9 WIRING
Wiring shall be complete in all respects to ensure proper functioning
control, protection,
monitoring
of
the
and interlocking schemes.
Wiring shall be done with flexible 650V grade, PVC insulated, switch board
wires with 2.5 sq.mm stranded copper conductor. Wiring between individual poles
and control cubicle shall be routed through G.I. conduits.
Each wire shall be identified at both ends with permanent markers bearing wire
numbers as per wiring diagram.
Wire termination shall be done with crimping
type connectors with insulating
sleeves. Wires shall not be spliced between terminals.
All spare contacts of relays, push buttons, auxiliary switches etc. shall be wired up
to terminal blocks in the control cubicle.
5.2.10 TERMINAL BLOCKS :
Terminal
blocks
shall be 650 V grade,
box
clamp
approved equal. Not more than two wires shall
Spare
terminals
equal
in
number
be
type ELMEX 10 sq.mm or
connected to any terminal.
to 20% of active
terminals
shall
be
furnished.
Terminal
blocks shall be located to allow
arranged that
individual
wires
of
easy
access. Wiring
shall
be
so
an external cable can be connected to
consecutive terminals.
5.2.11 TYPE OF MOUNTING :
The circuit breaker shall be suitable for mounting on fabricated galvanised steel
pedestal which shall be supplied along with the breakers. CT mounting bracket
will also be supplied along with the breaker and shall be galvanised.
5.2.12 TERMINAL CONNECTORS :
1250 Amp. current rating terminal connectors of the circuit breakers suitable
for connecting to ACSR Panther and Dog Conductor shall be supplied along with the
breakers. Suitable earth connectors for earthing connections shall also be supplied
with the circuit breakers. The
terminal connectors shall
conform to relevant
standard IS-5561.
5.3
FITTING AND ACCESSORIES :
Each circuit breaker shall be furnished complete with fittings and accessories as
listed below :
5.3.1 Clamp type bimetallic/Alluminium Alloy terminal connectors
suitable
for ACSR
Panther and Dog Conductor suitable both for horizontal & vertical take off.
5.3.2
Two ground pads suitable for termination of 50 x 6 mm flats.
5.3.3 Complete mounting steel pedestal along with CT mounting bracket.
5.3.4
Operating mechanism, double tripping coils and closing coil.
5.3.5 Auxiliary contacts and relays.
5.3.6
Local/remote selector switch, trip normal close control pistol control switch.
TN-01/32
5.3.7 Manual tripping devices with protective flap for
VCB's only mechanical ON-OFF
indicator.
5.3.8 Operation counter.
5.3.9
Weather proof outdoor type control cubicle and pole boxes. Set of switch fuse
units for AC and DC supply.
5.3.10 Space heater with thermostat and ON-OFF switch.
5.3.11 Cubicle illumination lamps with ON-OFF switch.
5.3.12 3 Pin 5A socket with ON-OFF switch.
5.3.13 Terminal blocks and internal wiring - lot as required.
5.3.14 Set of prefabricated pipe, fittings, clamps, hardware,
interconnecting wires/cables
etc. for connection between control cubicle and pole boxes as may be required to
complete.
5.3.15 Interconnecting wires, GI conduits and
accessories
for connection
between
control cubicle and pole boxes.
5.3.16 Other
standard accessories which are
not
specifically mentioned
but
are
required to be supplied with breakers of similar type and rating for efficient and
trouble free operation.
5.4
PAINTING & FINISHING
All interiors and exteriors of switchgear enclosure, breaker mechanism etc shall be
finished and painted to produce a neat, fire resistant and durable surface which
would prevent rusting and corrosion. Sheet metal component shall be pre-treated
using 7 tank
phosphating process consisting of de-greasing, acid pickling, de-
rusting, phosphating and passivation including repeated rinsing in between. On
completion of the passivation of the components, they shall be preheated and then
epoxy power coated or treated with one coat of primer & zinc chromate and
finished with two coats of light gray enamel paint of shade 631 of IS 5 and stoved
to achieve excellent anti-rusting and scratch resistant properties. The thickness of
painting shall be around 60 microns.
6.0
6.1
TESTS:
TEST BEFORE DESPATCH :
The 36 KV circuit breakers and accessories shall be
subjected to the following tests as per relevant IS/IEC before dispatch at
manufacture's works ,.
A)
ROUTINE TESTS ON EACH UNIT AS PER RELEVANT STANDARDS :
(i)
One minute power frequency voltage withstand dry
test on main circuit.
(ii)
Voltage withstand test on control &
auxiliary
circuits.
(iii)
B)
Measurement of the resistance of main circuit.
(iv)
Mechanical operating test as per M-2 class.
(v)
Design and visual checks.
TYPE TESTS CONDUCTED ON ONE UNIT OF EACH RATING
AS PER RELEVANT STANDARDS:
TN-01/33
(i)
Dielectric tests.
a) Lightning Impulse Voltage Test.
b) One Minute Power Frequency Test (Wet & Dry).
(ii)
Short time withstand current and peak withstand
current test.
(iii)
Basic short circuit duties test.
(iv)
Single phase short circuit test.
(v)
Mechanical Operation Test as per M-2 class.
(vi)
Out of phase making & breaking test.
(vii)
Capacitive current switching test.
a) Cable Charging Test.
b) Single Capacitor Bank Current Switching Test.
(viii) Measurement of resistance of main circuit.
(ix)
Temp. rise test.
(x)
Environmental Tests:
a) High Temperature Test as per clause No. 6.101.3.4 of
IEC:62271-100
OR
a) Documenting satisfactory circuit-breaker field experience in at least one
location with ambient air temperatures frequently at or above the specified
maximum ambient air temperature of 50 °C.
(xi)
IP-55 test (for cubical/control cabinet).
(xii)
Any
other
type tests
not
specified
above
but
covered as per amendment/latest edition of relevant IS/IEC.
6.2
TYPE TESTS :
The successful bidder must furnish type test reports.
Where permitted in the relevant standard, a test specimen for type test may be a
representative sub-assembly/ a representative functional unit. An individual type
test is acceptable for a change of constructional detail, for any change in the
design/type of type test report and the design/type of offered against this
specification, if the manufacturer can demonstrate and purchaser is satisfied that
this change does not influence the result of the individual type test. The bidder may
bring out in their offer all such changes made in components, materials, design etc.
as the case may be. The purchaser will interpret the meanings of drawings and
specifications and shall have the power to accept/reject any type test report which
in his judgment is/is not in a manner acceptable to him. The decision of Purchase
Committee in this matter shall be final and binding to all.
6.3
TEST ON BOUGHT OUT ITEMS :
Tests are not required to be performed on bought
motor,
terminal
manufacturer.
connector,
CTs,
Furnishing Test
equipment manufacturers
shall
PTs, Relays,
Certificate
be
Meters
etc. at the works of
of these items from
deemed to
TN-01/34
out equipments/items like
be
the
satisfactory
original
evidence.
Inspection
of
the
tests
at
Sub-contractors
works
will
be arranged by the
supplier whenever required.
6.4
ROUTINE/ACCEPTANCE TESTS :
(i)
The following acceptance and routine tests shall be got conducted in presence
of purchaser's representative as per stipulation of the relevant standards, on
each unit.
a)
One minute power frequency voltage withstand dry test on main circuit.
b)
Voltage withstand test on control & auxiliary circuits.
c)
Measurement of the resistance of main circuit.
d)
Mechanical operating test as per M-2 class.
e)
Design and visual checks
f)
Any other test not specified above but covered as per amendment/latest
edition of relevant IS/IEC.
6.5
TOLERANCE ON TEST RESULTS :
As per relevant standards/specification.
6.6
TEST AT SITE :
The purchaser reserves the right to conduct all tests on 36 KV circuit breakers after
arrival at site and the
contractor shall
guarantee test certificate figures under
actual service conditions.
7.0
INSPECTION :
All the tests (as mentioned at Clause 6.4) and Inspection shall
be
made at the
place of manufacturer unless otherwise especially agreed upon by the bidder and
purchaser at the time of purchase. The bidder shall afford the inspection officer(s)
representing the purchaser all reasonable facilities without charges, to satisfy him
that the material is being furnished
purchaser has the
in accordance with this specification. The
right to have the tests carried out at his own cost by an
independent agency whenever there is a dispute regarding the quality of supply.
The Inspection may be carried out by the purchaser at any stage of manufacture/
before dispatch as per relevant standard.
Inspection
and
acceptance
of any
material
under
the
specification by the
purchaser, shall not relieve the bidder of his obligation of supplying material in
accordance with the specification and shall not prevent subsequent rejection if the
material is found to be defective. The Bidder shall keep the purchaser informed in
advance, about manufacturing programme so that arrangements can be made for
inspection.
The purchaser reserves the right to insist for witnessing the acceptance/ routine
testings of the bought out items.
The
Bidder shall give 15 days advance intimation to enable the purchaser to
depute his representative for witnessing the acceptance and
TN-01/35
routine
tests.
8.0
DOCUMENTATION :
8.1
All drawings shall conform to International Standards Organization
(ISO) `A',
series of drawing sheet / specification, Standards specification IEC-56/IS-13118 &
relevant standards.
All drawings shall be in ink and suitable for micro filming. All
dimensions and data shall be in S.I Units.
8.2
List of drawings and documents :
The successful bidder shall furnish four sets of following
drawings along with his
offer.
a)
General
b)
outline
Graphs
and assembly
showing
drawings
the performance
of
the equipment.
of
equipment’s
in regard to
magnetisation characteristics.
c)
Sectional views showing -
i)
General Constructional features.
ii)
the materials/ gaskets /sealings used.
iii)
the insulation, the winding arrangements, method
primary/secondary winding to
iv)
of connection of the
the primary/ secondary terminals etc.
porcelain used and its dimensions
along with
the mechanical and electrical
characteristics.
d)
arrangement of terminal's and details of
e)
Name / Rating Plate
f)
Schematic Wiring drawing with write up.
g)
Type test reports in case the equipment
connection studs provided.
has
already
been type tested.
h)
Test reports, literature, pamphlets of the bought out items, and raw material.
All items of equipment included in this specification shall be provided with rating
plates as per relevant standards and in addition with following particulars :
8.3
i)
Name & Address of Supplier
ii)
Telephone No.
iii)
Fax No.
iv)
Date of Despatch
v)
Date of Expiry of Warranty
vi)
Name of Purchaser
vii)
TN No.
The
manufacturing of the equipments
approved drawings and
shall
be
strictly in accordance with the
no deviation shall be permitted without the written
approval of the purchaser. All manufacturing and fabrication work in connection
with the equipment prior to the approval of the drawing shall be at the supplier's
risk.
8.4
Approval of drawings/work by purchaser shall not
responsibility and liability for
the
relieve the supplier of his
ensuring correctness and correct interpretation of
drawings for meeting the requirement of the latest revision of applicable
standards, rules
and
codes
of practices. The equipment
TN-01/36
shall conform
in all
respects to
high
standards of
engineering,
design,
workmanship and latest
revisions of relevant standards at the time of ordering and purchaser shall have
the power to reject any work or
materials which, in his judgments is not in full
accordance therewith.
9.0
PACKING AND FORWARDING :
9.1
The
equipments
transport as
shall
the
be
packed
case may
be,
transport and outdoor storage
responsible
for any
in
damage
crates
suitable
and
suitable
during
transit.
to
improper
and inadequate packing.
carefully
packed
and marked
to
the equipment
The easily
with
for
vertical/horizontal
withstand handling during
The
supplier
during transit, due
damageable
the
appropriate
be provided.
Any material found short inside
the
be
to
material shall be
caution
Wherever necessary, proper arrangement for lifting, such as
shall
shall
symbol.
lifting hooks
etc.
packing cases shall
be supplied by supplier without any extra cost.
9.2
Each consignment shall be accompanied with a detailed
the
packing
list
containing
following information:
a) Name of the consignee.
b) Details of consignment
c) Destination
d) Total weight of consignment.
e) Sign showing upper/lower side of the crate.
f) Handling and unpacking instructions.
g) Bill of material indicating contents of each package.
9.3
The supplier shall ensure that the packing list and bill of material are approved by the
purchaser before dispatch.
10.0
Optional Spares :
The
bidder
shall
also recommend optional
breakers along with their total and unit
spares that will be required for
prices. However, the
prices of optional
spares will not be considered for bid evaluation.
11.0
OPTIONAL TOOLS AND TACKLES :
The bidder shall also recommend optional tools and tackle that be
required
for
general maintenance and operation of circuit breakers, along with their total and
unit prices.
However,
the prices of these tools and tackle shall
not be considered for bid
evaluation.
13.0
PERFORMANCE WARRANTY PERIOD :
The performance warranty period shall be 5 (Five) years from the date of receipt of
equipment along with all accessories.
TN-01/37
TECHNICAL SPECIFICATION OF 12 KV INDOOR TYPE
VACUUM CIRCUIT BREAKERS AGAINST
1.0
SCOPE :
This
specification
manufacturer's
works
covers
the
design,
before
dispatch,
manufacture,
assembly,
testing
supply, delivery of 3 pole, 50 Hz,
12
at
KV
switchgear and control gear panels for indoor installation fitted with 12 KV vacuum circuit
breakers including voltage transformers, current transformers,
metering instruments,
protection relays etc. as per schedule of requirement and installation & commissioning by
the supplier as per Schedule-III (Part-B). The power system is with neutral solidly earthed.
The equipment offered shall be safe, reliable and compact to install. The workmanship shall
be of high order. The circuit breaker and protective devices shall be of latest design so as
to ensure rapid and efficient interruption of fault current, low arc energy, small arcing
time, complete phase segregation and freedom from fire hazards.
1.1 STANDARDS :
The circuit breaker/metal enclosed switchgear, Voltage transformers, current
transformers and all other equipment shall also comply with the requirement of latest
edition of relevant Indian standards. Deviation from the standards and this specification if
any, should be brought out in the tender and justified. Voltage transformer and
current transformers shall be mounted within the panels.
The governing standard shall
be :
S.
IS/IEC
Reference
Specification
1.
IEC-60298
A.C. Metal – enclosed and control gear for rated voltages
above 1KV and including 72.5KV
2.
IS-3427
A.C. Metal – enclosed and control gear for rated voltages
above 1KV and including 52KV.
3.
IS-8623
Specification for Low Voltage Switchgear and Control gear
assemblies.
4.
IS-13118// IEC62271-100/ IEC62271-200
Specification for High Voltage AC Circuit Breakers.
5.
IEC-60529
Degrees of Protection.
6.
IS-5578 & 11353
Making and arrangement for switchgear bus bar main
connections and auxiliary wiring.
7.
IS-325
Specification for 3 Phase Induction motors.
8.
IS-2629
Recommended practice for not dip galvanizing of iron and
steel.
9.
IEC-60137
Bushing for AC Voltages.
No.
TN-01/38
10.
IS-3347
Porcelain Transformer Bushings.
11.
IS-5561
Terminal Connectors
12.
IS-3156
Voltage Transformers
13.
IS-2705
Current Transformers
14.
IS-3231
Electric relays for power protection.
15.
IS-13779
Static Energy Meters
16.
IS-8686
Static Protection Relays
17.
IS-1248
Electrical measuring instruments
18.
IS-2099
High Voltage Porcelain Bushings.
19.
IS-10118
Minimum clearances for Outdoor Switchgear.
20.
IEC-60694
Common Clauses for High Voltage Switchgear and Control
gear.
21.
IEC-60255 &
Numerical Relays
IEC-61330
Equipments conforming to any other
internationally accepted standard(s) which
ensure(s) equal or better quality than the standard(s) mentioned above would also
be accepted. In case the tenderers wish to offer
equipment conforming to
other standards or alternative offer which tenderer considers advisable by reason
of his own manufacturing requirement and experience would be acceptable provided
descriptive matter, literature and complete certificates are submitted pointing out
that the equipment/devices/arrangements as offered are equal or superior to that
required by the accompanying specification
furnish
English translation of the
conforms to any
other
relevant
standards.
Salient
with full justification. They
standards where
points
of
the
difference
shall
equipment
between
the
standards adopted and those mentioned above shall be brought out.
1.2
a) PARTICULARS OF SYSTEM :
i) Nominal system voltage
:
ii) Highest system voltage : 12 KV
iii) Frequency
:
iv) No. of phases
:
v) Neutral earthing
:
b) SERVICE CONDITIONS :
The equipment should operate
specified in this specification. The
11 KV
50 Hz
03
Effectively earthed
satisfactorily under
reference
the climatic conditions
maximum ambient Air temperature
may be taken as 50 Deg. C. as against 40 Deg. C. The permissible temperature
rise for various equipments offered should therefore be derated accordingly.
1.2.1 CLIMATIC CONDITIONS:
i) Peak ambient air temperature
in shade.
ii)
50 DEG C
Minimum ambient air temperature
TN-01/39
in shade.
(-) 5 DEG C
iii) Maximum relative humidity
95%
iv)
Minimum relative humidity
10%
v)
Dust storms are liable to occur
from the period from March to July.
vi)
Height above mean sea level
Less than 1000M
vii) Average number of thunder
40 Days
storm days per annum.
viii) Average annual rainfall
10-100 cm
(Depending on area)
ix)
Number of months of tropical
monsoon conditions p.a.
June to Sept.
1.3 PRINCIPAL PARAMETERS
1.3.1 CIRCUIT BREAKERS :
a) Rating and characteristics of circuit breakers :
1. No. of poles
:
2. Class
:
3. Rated voltage
:
4. Rated insulation level
a) Lightning impulse voltage
:
b) One minute power frequency
:
withstand voltage.
5. Rated frequency
:
6. Rated normal current
:
7. Short circuit breaking capacity
:
8. Short time withstand current
:
for 3 secs.
9. First pole to clear factor
:
10. Protection class
:
11. Maximum opening time
:
12. Rated operating sequence
:
13. Minimum operations at full
:
rated short circuit breaking current.
14. Rated Breaking Capacity
i) Symmetrical
:
ii) Asymmetrical
:
15. Rated making capacity
:
16. Operating Mechanism
:
3
Indoor
12 KV
75 KV (Peak)
As per relevant standards.
50 Hz
630 A
16 KA
16 KA
1.5
IP 5X
5 Cycles
0-0.3Sec.-CO-3min-CO
100
16 KA
As per ISS
2.50x16 KA
Motor operated Spring
charged closing
mechanism or magnetic actuator.
:
240 V A/C
:
110V DC
mechanism
of Circuit breaker and
17. Heater/Lamp/Socket
18. Control Voltage
b)
Characteristics of the operating
associated equipment :
i) Method of operation : The circuit breakers shall
operated mechanism to
operate
all the
three
be equipped
phases
with power
simultaneously
using
220/240V universal motors operated spring closing mechanism or magnetic
actuator.
The circuit
breakers
shall
spring closing mechanism or magnetic
also
be
provided
with
actuator. The Circuit
hand
operated
Breaker shall have
electrical and mechanical tripping arrangements under various conditions. In case
of spring closing mechanism no main spring of the mechanism shall be plated,
powder coated or given any other treatment so that spring property is not lost.
TN-01/40
ii) Number and type of spare, auxiliary switches : Adequate number of spare
auxiliary switches/ contacts
both of normally open and normally close type but
not less than four each shall be provided on the circuit breaker for use in the
indication and controlling scheme of the circuit breaker.
iii)Rated
supply voltage and rated supply
frequency
: The rated voltage for the
auxiliary supply shall be 240 V, 50 Hz AC supply.
1.3.2
DESIGN CRITERIA
The bidder shall quote 12 KV Indoor VCBs conforming to M-2 Class.
The equipment will be used in high voltage system having characteristics as listed
in the specification. The equipment will be installed indoor in a hot, humid and
tropical atmosphere.
All
equipment, accessories and wiring shall
have tropical protection, involving
special treatment of metal and insulation against fungus, insects and corrosion.
The maximum temperature in any part of the equipment at specified rating shall not
exceed the permissible limits as stipulated in the relevant standards and this
specification.
The
equipment
shall
be capable
of
withstanding
the dynamic
and
thermal
stresses of listed short circuit current without any damage or deterioration.
The safety clearances of all live parts of the equipment
shall be as per relevant
standards.
1.3.3 CONSTRUCTIONAL FEATURES :
The circuit breakers shall be triple pole metal clad truck mounted horizontal draw
out
type
enclosed in cubicle made of CRCA sheet
steel
of minimum 2 mm
thickness and shall comply with latest edition of relevant IS. The cubicle/panels
shall
be
vermin
construction.
proof and dust tight.
The cubicle shall be of folded type
Panel width shall be 610 mm. ± 50 mm.
The
switchgears
and
control gear shall be complete with all necessary supporting frame work, nuts
and bolts etc. for securing the same to the floor. The operating mechanism shall
operate
(close/open)
mechanism,
shutters
links
all
the
three
phases simultaneously. The operating
etc. should be accessible for maintenance. Mechanical
should be provided between breaker and
panel.
safety
Engagement and
disengagement of auxiliary supply should be automatically linked through the
movement of the truck so that in service condition auxiliary supply is automatically
made. All
six terminals shall brought out of cubicle through appropriate class of
cable termination and sealing kits. All the breakers shall be supplied with necessary
clamps suitable for appropriate current ratings. Suitable arrangement of earthing
the switchgear and control gear panels shall be provided. All the connecting bus
bar shall be made of copper for these indoor circuit
breakers.
For indoor panels, SWITCHGEAR (circuit breakers, CTs, PTs etc.) and control-gear
(relays, C&R panels meters etc.) shall be mounted on the same panel. A set of
air insulated electrolytic
copper
bus bars having maximum current density 1.5
2
Amp. / mm & minimum cross sectional area 600 mm2 with PVC sleeves or PVC
insulation are
to
be provided
for
all
TN-01/41
indoor
switchgear
panels.
The
switchgear panels shall be provided with the arrangement for extending the bus bar
and inter-connecting bus bars. Their supports, nuts and bolts etc. will be supplied
loose. The region of such inter connection
shall normally be blanked on panels.
The bus bars should be of electrolytic copper with permissible limits of current
density. Size of the bus bar and current density should be specified in the tender.
The bus bar conductor shall
conform to IS:8034. The bus bar shall be rated for
16KA for 3 Seconds. Painting of panel cubicle shall be epoxy based powder coated.
The paint shade of indoor panels shall be shade 631 as per IS-5.
1.3.4 VACUUM CIRCUIT BREAKER :
The three phase vacuum circuit breakers will have
interrupter per phase) mounted on same carriage.
The
three interrupters (one
interrupters shall be air
insulated in epoxy resin tank or with epoxy resin phase barriers. Each interrupter
shall have fixed and moving contacts in sealed envelope having vacuum below
10-6 torr. The metallic bellow shall permit axial movement of moving contact and
act as vacuum seal. The contacts shall
good
electrical
and
thermal
have requisite
conductivity
and
shall
mechanical strength and
be
made
of
copper
chromium alloy. Complete literature of vacuum bottles shall be furnished with the
tender.In order to have safe operation under fetal conditions, the vacuum
interrupter should be housed in epoxy pole unit and make of Vacuum Interrupter
will be as “BEL, CGL, SIEMENS, ABB, ALSTOM/AREVA/MEGAWIN”.Any other
equivalent make of V.I. shall also be acceptable subject to prior approval of S.E.
(MM), JVVNL, Jaipur.
1.4
VOLTAGE TRANSFORMERS :
1. Highest equipment voltage
2. No. of phases
3. Insulation level
a) Impulse withstand voltage
b) One minute power frequency
withstand voltage on :
i) Primary winding
ii) Secondary winding
4. Frequency
5. Transformation ratio
6. Rated output
7. Accuracy class
8. Winding connection
9. Rated voltage factor
10.Type of insulation
:
:
12 KV
3
:
75 KVP
:
:
:
:
:
:
:
As per relevant standards
2 KV rms
50 Hz.
11000/110 V
30 VA / phase
0.5
Star/Star
: 1.2 continuous and 1.5 for 30
seconds
Resin cast
:
VTs shall be provided with HRC type fuses on the secondary side. The VT fuses
on primary side shall also be provided with all safety precautions. One of the
secondary terminals of the VTs shall be solidly earthed. One number three phase
voltage transformer of this rated output will be required for each incoming indoor
panel. Voltage transformers should be mounted in the top part of the cubicle for
ease of replacement of fuses.
1.5
CURRENT TRANSFORMERS :
1. Rated voltage
2. Insulation level
:
TN-01/42
12 KV
a) Impulse withstand
voltage
b) One minute power
frequency voltage on
i) Primary winding
ii)Secondary winding
3.
Frequency
5.
Rated continuous thermal
current
:
75 KVP
:
:
As per relevant standards
03 KV rms
:
50 Hz
:
120% of rated primary current
:
16 KA for 3 Sec.
5.
Short time thermal rating
6.
Transformer CTs of ratio
600-400/5-5A for incoming type indoor panel and 200-100/5-5A for outgoing
type panel.
Rated output/accuracy etc. for CTs.
Core-I
Core-II
a) Rated output
10 VA
10 VA
7.
8.
9.
However VA burden
should not be less than suitable for
A.C. series trip requirement with
shunt trip arrangement.
b) Class of accuracy
c) Accuracy limit factor
d) Purpose
Max. instrument security
factor
Type of Insulation
5P
15
Relaying
-
0.5 S
Metering
5
Resin Cast
12 KV current transformers shall be single phase. The core shall be of high grade
non ageing laminated silicon steel of low hysterics loss and high permeability to
ensure high accuracy for both normal and fault current.
1.6 The rating of secondary winding shall be 5 Amps. However, the current transformers
will have
to satisfy
the
requirement of rated VA burden,
class
of accuracy,
accuracy limit factor and short time thermal rating as have been specified in clause
No. 3.5 at
all transformation
ratio. Magnetization curves
corresponding
to
all
secondary taps must be submitted with the tender.
The ratings of current transformers of all classes regarding ratio error, knee
point voltage, resistance of secondary winding etc. shall have to be coordinated
with
the
requirements of protective
relays
and protection scheme, without
any extra cost.
1.7
Before commencement of supplies one panel of each type with circuit breaker, VT
etc. will have to be subjected to temperature rise test without extra charges in the
presence of our Inspecting Officer. All the type test certificates are also needed
to be furnished without which tender is likely to be ignored.
1.8
The
tenderer shall also
arrangement,
schematic
furnish
and
along with
the tender,
complete
general
outline diagrams indicating the mounting
arrangement and position of current transformers, voltage
blocks etc. Type of current transformer and
shall also be clearly stated.
TN-01/43
voltage
transformer
terminal
transformer employed
1.9
INDICATING AND INTEGRATING METERS/INSTRUMENTS :
1.9.1 All indicating instruments shall be of switchboard type, back connected, suitable for
flush mounting and provided
with dust and vermin proof cases for tropical use
and finished in suitable colour. All instruments shall
have
practical laboratory
means for adjustment of accuracy. The limits of errors for ammeters/voltmeters
shall
be those
ammeters
and
current/voltage
selector
permissible
for
class 1.5
voltmeters shall be
for all
switch with
the
rating
four/six
instruments
suitably
as
per IS:1248. The
scaled
of current/voltage
to indicate
the
transformers. A phase
position shall be used
to
measure
the
current/voltage of each phase/line. The meters shall be located at eye level to
facilitate observation of readings correctly.
1.9.2 A.C. Static HT Trivector Meter :
3
phase
4 wire A.C. Static H.T. Trivector
meter
of accuracy
class
0.5S for
measurement of energy as per latest specification of JVVNL, shall be provided on
each 12 KV indoor VCB.
Following makes of HT TVMs are acceptable:
i) Secure
ii) L&T
iii) ABB/Elster
iv) Schlumberger
v) Genus Infra
Any other make being procured by Nigam shall also be acceptable.
1.10 RELAYS :
The circuit breaker shall be fitted with shunt trip coil for operation on Numerical
three Over Current and one Earth Fault element relay. The coils should be rated for
110VDC operation on station battery.
Three phase protection relays shall be Numerical Over-current & Earth Fault
protection having three element for over current and one for earth fault protection.
The setting for over-current shall be 50-200% (in step of 10%) and for earth fault
element from 10 to 80% (in step of 10%).
These relays shall be non directional
with selectable curve from all standard 5 IDMT curves. The numerical relays shall
have following features:i)
Self Diagnosis
ii)
Minimum last five abnormal events (with date & time)
recording (over
current & earth fault) including fault level and phase.
iii)
On-line display of current.
iv)
Communicable with open Protocol having RS-485 port.
The relay shall be numerical type mounted in flush pattern on the panel board. The
relay should be rated for 5 Amp. CT secondary.
IS:3231 & 8686 specifications.
The relay should conform to
The tenders shall furnish the detail in this regard
along with the offer.
All the relays shall be provided with test blocks in panel so designed that the relays
may be tested in situ. The relays should have provision of testing either through
test block or test plug easily accessible by injecting the voltage / current/frequency
TN-01/44
(as
applicable)
from
external
testing
instruments
/source
without
first
disconnecting/ reenergizing the primary electrical circuit protected by the relays.
Facilities for isolating the tripping circuit during such testing shall be also provided.
The requirement of test block shall not be applicable in case of drawout type relays
which can be tested by using test plug without removing the relay from its casing.
The testing facilities provided in the relays shall be specifically stated in the bid.
Necessary test plug etc. as may be required for proper testing shall be included in
the contractor’s scope of supply. One test plug with five panels or part thereof are
to be supplied. Technical suitability of relays/schemes may also be examined
by Protection Wing & acceptability will be judged appropriately.
The Following makes of Relays are acceptable:a. Areva.
b. ABB.
c. Easun Reyrolle
d. C&S
e. JVS
f. SEL
g. ASHIDA
h. MEGAWIN
i. CGL
j. STELMEC
1.11. WIRING :
All wiring shall be of switch board type consisting of copper conductor of 1.5 Sq.
mm. for alarm / annunciation / control circuits and 2.5 Sq.mm. for CT and all other
Circuits insulated with polyvinyl chloride insulation suitable for 660 Volt
and
in accordance
with
relevant
service
IS:732. Polyvinyl Chloride used shall have
excellent resistance against burning, moisture, oil and vermin and shall be finished
with clear colour.
shall
furnish
Rubber insulated wiring shall not be acceptable. Tenderers
the details
of
method being adopted by them
for
Joint/
Connections.
All instruments and Panel wiring shall be of heat resisting and self extinguishing
type in compliance with IS.
Plastic
or
porcelain
cleats
of
the
limited
compression type shall be used for holding wiring runs. All wires shall be suitable
for bending to meet the terminal studs
apparatus
at right angles. Metal cases of all
mounted on panels shall be separately
wire or strips.
The following colour
earthed
by means of copper
scheme of the wiring shall be used as per
IS:375.
a)
AC three phase circuits :
i)
No.1 Phase
No.2 Phase
No.3 Phase
: Red.
: Yellow.
: Blue
ii) Neutral Conductor
: Black
iii) Connection to Earth : Green
b) D.C. circuits
: Grey
1.12 MIMIC DIAGRAM :
For indoor panels painted colour bands shall be used for the mimic bus. The mimic
diagram shall be on eye
level.
Equipments
TN-01/45
such
as
current
transformers,
voltage transformers etc. shall be represented by
suitable symbols. The colour
shall be Red Shade 537 of IS-5.
1.13 INDICATING LEDs / LAMPS :
Indicating LEDs / Lamps shall be provided on the control
board to indicate the
following:
1. Visual indication of ON and OFF position of each
circuit breaker.
2. Trip circuit healthy indication.
3. Auto trip indication for each circuit breaker panel.
4. VT supply indication.
Each lamp body shall be of moulded insulation and shall be able to withstand a high
voltage test of appropriate value. All lamps shall be suitable for 240 V AC supply
and shall have low power consumption and shall provide a wide
illumination of sufficient intensity
colour shall be
angle of
for comfortable viewing. A glass of appropriate
screwed into the front of the lamp body. The
indication lamps shall be such as to
design of
the
facilitate replacement of burnt lamps. An
engraved label indicating the purpose of the lamp shall be provided with each
lamp.
1.14 TEST TERMINAL BLOCKS :
Two nos. test terminal blocks shall be provided one for testing of relays and other
for testing meters. They shall be of switch board, back connected type for front of
panel
mounting. The test blocks shall
provide complete isolation of meters,
instruments, etc. and the arrangement shall be such that testing power could be
connected at the test block from any external source
or may be taken from the
instrument transformers. Provision shall be made for short circuiting current
transformers. Suitable
sealing arrangement shall be provided
in
test terminal
blocks.
1.15 FERRULES :
Ferrules
engraved/printed
with
the same
number,
letters
or symbols
as
indicated in the connection and wiring diagram shall be provided on the terminal
ends
of
all wires for identification of circuits for inspection
and maintenance.
Ferrules shall be of strong and flexible insulating material with glossy finish to
prevent adhesion. They shall be engraved / printed and clearly marked and shall
not be effected by dampness. Ferrule numbering
shall be in accordance with
IS:375. The same ferrule number shall not be used on wires in different circuits
on a panel.
1.16 SPACE FOR CABLES AND CABLE GLANDS :
Sufficient space for receiving the cables inside the switch board at the bottom of
the cubicles and mounting arrangement for the terminal cable glands shall be
provided.
Cable gland plates should be above the ground level for the ease of
working.
3.17 SCHEDULE OF REQUIREMENTS :
TN-01/46
The requirement
of circuit breakers shall be as per Clause 3.31. At a particular
sub station two or more feeders can be controlled through one breaker depending
upon the necessity. Each of these breakers shall be equipped as per clause No.
3.18.
1.18 SCHEDULE OF EQUIPMENT :
Item No. 1 :
(INCOMING TYPE)
12KV/630A Amp. VCB Switchgear panel for indoor installation:
1. 12KV/630A Circuit Breaker vacuum type
drawout with provisions of manual tripping by
means of A control switch/push button.
1 No.
2. Motor Charged Spring operated closing
mechanism or magnetic actuator operated
device.
4. Numerical 3 0/C + 1 E/F relay
4. Single phase 12 KV current transformers
of ratio 600-400/5-5A suitable for metering
and protection. The class of accuracy shall
be 0.5 S for metering and 5P15 for protection.
Rated burden (output) shall be 10 VA
for each secondary winding. Instrument
security factor for metering core shall not
exceed 5.
1 No.
6.
11000/110 Volts three phase voltage
transformers having 30 VA/phase burden
and class of accuracy 0.5. The transformer shall
be star-star connected.
1 No.
6. Flush type switchboard mounting pattern 96X
96 sq.mm moving iron/ moving coil AC voltmeter of class
1.5 accuracy suitable for 110 V phase to
phase secondary scaled for 0-15 KV.
1 No.
7. Voltmeter phase selector switch to
indicate phase to phase and phase to neutral
voltage of all the three phases.
1 No.
8. Indicating lamps/LEDs coloured red, amber and
blue for PT supply indication.
3 Nos.
9.
2 Nos.
10.
Arrangement for reception of incoming
cable connection alongwith cable termination
and sealing kits for 3 C x 300 mm sq. XLPE
power cables.
Set of three phase air insulated main
electrolytic copper bus bars of 630 A
continuous current rating having maximum
current density 1.5 Amp./ mm2& minimum
cross sectional area 600 mm2 with PVC insulation
or sleeves, STC rating 16 KA for 3 sec.
1 No.
3 Nos.
1 No.
11. Mechanical ON/OFF indicator.
1 No.
12. Operating handle for independent manual
closing mechanism.
1 No.
TN-01/47
13. Red indicating lamp/LED for ON indication.
1 No.
14. Green indicating lamp/LED for OFF indication.
1 No.
15. Auxiliary switch having minimum of 8
contacts 4 normally open and 4 normally
closed.
1 No.
16. Flush mounting pattern 96x96 sq.mm.
Moving Iron or moving coil ammeter of class 1.5 accuracy
for 5 Amps. CT secondary scale 0-400/600 A.
1 No.
17. Ammeter selector switch to indicate phase
current in all three phases and with OFF
position.
1 No.
18. AC HT Tri vector meter
1 No.
19. Auxiliary Relay type VAA 33 or equivalent
For transformer protection functions.
1 No.
20. Automatic door CFL with Switch.
1 No.
21.
240V, 80W AC single phase
anti condensation heaters with thermostat
(0-60 Deg. C) and switch.
2 Nos.
22. Anti pumping contactor.
1 No.
23. Operation Counter.
1 No.
24. Test terminal blocks for metering and
relays, 3 phase 4 wire.
2 Nos.
25. Fault trip yellow lamp/LED.
1 No.
26. Trip Circuit healthy indication.
2 Nos.
27. Ground Bus size min. 25 x 6 mm. copper.
1 No.
28. Bell for Alarm
1 No.
29. Hooter for Alarm
1 No.
30. 3 Pin Socket with switch
1 No.
31. 2 Pin Socket with switch
1 No.
32. Auto Trip Lamp
1 No.
Item No. 2 :
(OUTGOING/ FEEDER TYPE)
12KV/630A Amp. VCB Switchgear panel for
indoor installation:
1. 12KV/630A Circuit Breaker vacuum type
drawout with provisions of manual tripping by
means of A control switch/push button.
2. Motor Charged Spring operated closing
mechanism or magnetic actuator.
1 No.
3. Numerical 3 0/C + 1 E/F relay
1 No.
TN-01/48
1 No.
4. Single phase 12 KV current transformers
of ratio 200-100/5-5A suitable for metering
and protection. The class of accuracy shall
be 0.5 S for metering and 5P15 for protection.
Rated burden (output) shall be 10 VA
for each secondary winding. Instrument
security factor for metering core shall not
exceed
3 Nos.
5. Arrangement for reception of incoming and
outgoing cable connection alongwith cable
termination and sealing kits for 3 C x 300 mm
sq. XLPE power cables.
2 Nos.
6. Set of three phase air insulated main electrolytic
copper bus bars of 630 A continuous current
rating having maximum current density 1.5 Amp./mm2&
minimum cross sectional area 600 mm2 with PVC
insulation or sleeves. STC rating 16 KA for 3 seconds.
1 No.
7. Mechanical ON/OFF indicator.
1 No.
8. Operating handle for independent manual
closing mechanism.
1 No.
9. Red indicating lamp/LED for ON indication.
1 No.
10. Green indicating lamp/LED for OFF indication.
1 No.
11. Auxiliary switch having minimum of 8
contacts 4 normally open and 4 normally
closed.
1 No.
12. Flush mounting pattern 96x96 sq.mm.
Moving Iron or moving coil ammeter of class 1.5 accuracy
for 5 Amps. CT secondary scale 0-150/250 A.
1 No.
13. Ammeter selector switch to indicate phase
current in all three phases and with OFF
position.
1 No.
14. AC static HT Tri-vector meter
1 No.
15. Automatic door CFL with Switch.
1 No.
16.
240V, 80W AC single phase
anti condensation heaters with thermostat
(0-60 Deg. C) and switch.
2 Nos.
17. Anti pumping contactor.
1 No.
18. Operation Counter.
1 No.
19. Loose Set of 3 phase Air insulated inter
connection electrolytic copper bus bars, 630 Amps.
rating with PVC insulation with nuts and bolts
supports etc. STC rating 16 KA for 3 seconds.
1 No.
20. Test terminal blocks for metering and
relays, 3 phase 4 wire.
2 Nos.
21. Fault trip yellow lamp/LED.
1 No.
TN-01/49
22. Trip Circuit healthy indication.
2 Nos.
23. Ground Bus size min. 25 x 6 mm. copper.
1 No.
24. Bell for Alarm
1 No.
25. Hooter for Alarm
1 No.
26. 3 Pin Socket with switch
1 No.
27. 2 Pin Socket with switch
1 No.
28. Auto Trip Lamp
1 No.
1.19 All equipments shall be complete in all respect. All fittings, accessories or apparatus
which may not have been mentioned above but which are usual/necessary for the
equipments shall be included for each circuit breaker panel.
1.20 OPERATING AND MAINTENANCE INSTRUCTIONS :
The successful
tenderers, on receipt
immediately 20 sets
of
of
order
shall arrange
to
dispatch
the erection/operating and maintenance instruction
manuals along with the requisite drawings of the equipments covered by this
specification to this office for approval. Two sets of these, one set in English and
one in
Hindi
will
also
be
forwarded
to
the
consignee along with each
equipment.
1.21 TEMPERATURE RISE :
The maximum temperature rise of various parts of the circuit breakers when
tested
under
rated
ambient temperature
conditions shall not exceed the specified values at a peak
of 50 deg. c. The breakers may be
plated contacts if necessary to
meet
provided with
silver
the requirement of IS:13118 where higher
temperature rise is permitted with silver plating contacts. The quantity
facing shall be such that after carrying out
one tenth
of silver
of the total number of
operations specified for the mechanical endurance test, there is still continuous
layer of silver on the contacts. The temperature rise of CTs and PTs shall also not
exceed the permissible values as per relevant Indian Standards when corrected for
max. ambient temperature at site.
1.22 NAME/RATING PLATE :
All items of equipment included in this specification shall be provided with rating
plates as per relevant standards and in addition with following particulars:Name & Address of Supplier
Telephone No.
Fax No.
Date of Despatch
Date of Expiry of
Warranty
Name of Purchaser
TN No.
Purchase Order No. & Date
:
:
:
:
:
:
:
:
TN-01/50
1.23 INSPECTION AND TESTING :
1.23.1 Each equipment
shall
comply with and shall be subjected to all routine and
acceptance tests prescribed in the relevant Indian Standard Specification/IEC.
1.23.2
TEST OF 11KV INDOOR CIRCUIT BREAKER :
i)
ROUTINE/ACCEPTANCE TESTS:
The following acceptance and routine tests shall be got conducted in presence of
purchaser's representative
as
per stipulation of the relevant standards, on each
unit.
a)
One minute power frequency voltage withstand dry test on main circuit.
b)
Voltage withstand test on control & auxiliary circuits.
c)
Measurement of the resistance of main circuit.
d)
Mechanical operating test as per M2 class.
g)
Design and visual checks.
h)
Any other tests not specified above but covered as
per amendment/ latest
edition of relevant IS/IEC.
ii)
Inspection & tests on control gear :
In addition to the above tests at 3.23.2(i) above specified by IEC, the following shall
also be performed at manufacturer’s works in presence of purchaser’s representative
after completely assembling the breaker.
e)
Checking wiring of circuits and their contacts.
f)
Insulation resistance of complete wiring, circuit by circuit with all equipment
mounted on the panels.
g)
Checking and operational protective schedule and instruments meters.
h)
Checking of phase faults between R&Y, Y&B and B&R phases.
Breaker
should trip under all three conditions.
iv)
TYPE TESTS :
The following type tests shall be conducted on the offered material as per
relevant standards:-
a)
Dielectric tests.
Lightning Impulse Voltage Test.
One Minute Power Frequency Test(Dry).
b)
Short time with stand current and peak withstand current test.
c)
Basic short circuit duties test.
d)
Single phase short circuit test.
h)
Mechanical Operation Test.
i)
Out of phase making & breaking test.
j)
Capacitive Current Switching Test.
h)
k)
i)
Cable Charging Test.
ii)
Single Capacitor Bank Current Switching Test.
Measurement of resistance of main circuit.
Temp. rise test.
TN-01/51
l)
IP-5X test (for cubicle/control cabinet).
k)
Any other type tests not specified above but covered as per amendment /
latest edition of relevant IS/IEC
The 12 KV Indoor vacuum circuit breaker offered shall be fully type tested as per
relevant standards.
Where permitted in the relevant standard, a test specimen for type test may be a
representative sub-assembly/ a representative functional unit. An individual type
test is acceptable for a change of constructional detail, for any change in the
design/type of type test report and the design/type of offered against this
specification, if the manufacturer can demonstrate and purchaser is satisfied that
this change does not influence the result of the individual type test. The bidder may
bring out in their offer all such changes made in components, materials, design etc.
as the case may be. The purchaser will interpret the meanings of drawings and
specifications and shall have the power to accept/reject any type test report which
in his judgment is/is not in a manner acceptable to him. The decision of Purchase
Committee in this matter shall be final and binding to all.
1.23.3 The type test reports of Circuit Breakers, Current Transformers, Potential
Transformers, Relays, meters etc. shall be complete
in all respect
along with
oscillographic records, photographs etc. in respect of all type tests as per relevant
ISS/IEC.
The type test certificates should be in respect of specific make and type / rating
of
the
Circuit
Breakers/
instruments, transformers
etc.
intended to be
supplied and not in respect of the breakers etc. manufactured by their foreign
collaborators if any.
Necessary data with test reports to show capability of circuit breaker to withstand
number of full level short circuit faults be also furnished.
Complete literature must
be sent with the tender.
1.23.4 Routine & acceptance test as per relevant standard shall be carried out on each
equipment
covered
by
this
specification in the presence
of
purchaser's
representative. If so desired by the purchaser all test reports shall be submitted
and got approved from the purchaser
before
dispatch
of
the
equipment.
Before commencement of supplies one panel of each type complete with Circuit
Breaker, VT etc. will be subjected to temperature rise test in the presence of our
Inspecting Officer.
1.23.5INSPECTION AND TESTS OF CONTROL GEAR :
All the tests (as mentioned at Clause 3.23.2(i)) and Inspection shall be made
at the
bidder
place
of
manufacturer
unless otherwise especially agreed upon by
and purchaser at the time of purchase. The bidder shall
inspection officer(s) representing the
purchaser
all
the
afford the
reasonable facilities without
charges, to satisfy him that the material is being furnished in accordance with
this
specification. The purchaser has the right to have the tests carried out at
TN-01/52
his own cost by an independent agency whenever there is a dispute regarding
the quality of
supply.
The Inspection may be carried out by the
purchaser at
any
stage
of
manufacture/ before dispatch as per relevant standard.
Inspection and acceptance of any material under the specification
purchaser, shall not relieve the bidder
by
the
of his obligation of furnishing material
in accordance with the specification and shall not prevent subsequent rejection
if the material is found to be defective. The Bidder shall keep the purchaser
informed in
advance, about manufacturing programme so that arrangements can
be made for inspection.
The purchaser reserves the right to insist for witnessing the acceptance/ routine
testings of the bought out items.
The Bidder shall give 15 days advance intimation to enable the purchaser to depute
his representative for witnessing the acceptance and routine tests.
1.25
TECHNICAL PARTICULARS :
1.25.1
Make
of
various equipments should be
equivalent etc. shall not
clearly
stated.
Words
like
reputed,
be accepted. Alternative makes of equipments should
not be more than two in the order of preference.
1.25.2
INTER CHANGEABILITY :
All
similar materials and removable parts
of
similar equipments shall be inter
changeable with each other.
1.26
OPTIONAL SPARES:
The tenderer shall furnish list of recommended optional spares that will be required
for breakers alongwith their total and unit prices.
1.27
TITLE PLATES:
A title plate bearing the name and purpose of each panel shall be fixed on the top of
each control as well as relay panel.
1.28
FAULT / TROUBLE ALARM SCHEME :
The automatic trip of the Circuit Breaker due to operation of protection relays shall
be indicated by sounding of a hooter. All non-trip alarms shall be indicated by an
alarm bell.
1.29 PERFORMANCE WARRANTY PERIOD :
The performance warranty period shall be 5 years from the date of receipt of
equipment along with all accessories.
1.30
MAKE AND TYPE OF BOUGHT OUT ITEMS :
1.30.1 The following make of bought out items will be acceptable to department :
------------------------------------------------------------------------------------------------S.No. Name of Item
Make
------------------------------------------------------------------------------------------------1.
Indicating Instrument
AE/IMP/MECO
(Analog type)
2.
Indicating Instrument
AE/IMP/MECO
(Digital type)
3.
Control Switch for Circuit
ALSTOM/RECOM/SWITRON/
Breaker/Trip Transfer.
KAYCEE
TN-01/53
4.
Selector Switch for
Voltmeter/Ammeter
Semaphore Indicator
5.
6.
SWITRON/KAYCEE/RECOM
ALSTOM/DAV IND./ER
Indicating Lamp
7.
ALSTOM/TEKNIC/
VAISHNO/DAV
Annunciator
MINILEC/YESHMUN/
INSTALRAM/PROTON/
JVS/PRADEEP/ALAN
8.
Push Button
TEKNIC/VAISHNO/ESSEN
9.
A.C. Hooter/Bell
TARGET/INDUSTRIAL
HOOTER/ALAN/JVS
10.
D.C. Hooter
TARGET/INDUSTRIAL
HOOTER/ALAN/JVS
11.
12.
Heater
SOFIA/ELTER/AIREX
KAYCEE
Link Type test terminal
block for testing of TVM
IMP/CAPITAL
13.
CFL Tube
PHILIPS/CROMPTON/BAJAJ
14.
2 Pin/3 Pin socket with
Switch (5/15A)
ISI MARK
The other makes of all bought out items shall be acceptable if it is of "ISI
Marked" or type tested for which
bidder shall furnish attested
copies of ISI Certificate/type test reports not
respective
1.30.2
older than Five years for the
make offered, subject to prior approval of SE(MM), JVVNL, Jaipur.
Make / type of each relay, indicating
control
Photostat
switches,
instruments, integrating
selector switches,
indicating
lamps,
indicators, enunciator scheme, bell, hooter etc. shall be clearly
instruments,
semaphore
and invariably
indicated in the GTP (Guaranteed Technical Particulars), bill of material and unit
price list.
Only specific
"EQUIVALENT/REPUTED
1.31
make
MAKE"
accessories shall be indicated.
will
not
be
given
The
word
for consideration.
BILL OF MATERIAL :
The firm shall furnish the bill of material for Indoor VCB Panel separately.
1.32
OPTIONAL SPARES :
The bidder shall also furnish list of recommended optional spares that will be
required for Breakers along with their total and unit prices. However, the prices of
optional spares will not be considered for bid evaluation.
TN-01/54
TECHNICAL SPECIFICATION FOR 12 KV OUTDOOR
VACUUM CIRCUIT BREAKER KIOSKS
1.0
SCOPE
This specification
is
intended
to
cover
testing at manufacturer's works,
breaker
Kiosks
with
current
the
manufacture, assembly,
supply, delivery of 12 kV
transformers,
relays, metering instruments etc.
design
Complete
Vacuum
Circuit
Potential transformers, protection
with all accessories and Installation
& Commissioning by the supplier for efficient & trouble free operation (Separate
price for Installation & Commissioning and Civil works).
1.1
It is not the intent to specify completely
herein all details of the design and
construction of equipments. However, the equipment shall conform in all respects
to high standards of engineering, design and workmanship and shall be capable of
performing in continuous commercial operation upto the Bidder's guarantee in
a
manner acceptable to the Purchaser, who will interpret the meanings of
drawings and specifications and
material which
in
his judgment
shall
is
have
the
power
to reject any work or
not in accordance therewith.
equipment shall be complete with all components necessary for
The
offered
its effective and
trouble free operation along with associated equipments, interlocks, protection
schemes etc.
supply,
Such
irrespective
components shall be deemed to be
of
whether
those
are specially
within
the scope
of
brought out in this
specification and/or the commercial order or not.
2.0
STANDARDS
The 12 KV vacuum circuit breaker Kiosks
shall conform to latest revisions with
amendments of standards as under unless specified otherwise. Equipment meeting
any other authoritative standard which ensure equal
standard mentioned
above
will also
be
or better quality than the
acceptable. In such cases a copy
of
standard (English version) adopted, should be enclosed with the tender.
IEC62271/100-200
IS:13118/IS-3427
IS: 3156
IS: 2705
IS: 3231
IS:1248
IS:14697-1999
IEC-62053-22-2003
IEC-62052-11-2003
CBIP Technical Report
No.88 revised July, 1996
read with amendment
issued (April,99,
September,99 and also
any other amendment
thereafter).
High Voltage Switchgear & Control gears.
Circuit
Breaker/
metal
enclosed
Switchgear
and control gear.
Voltage transformers.
Current transformers.
Electrical Relays for power system.
Meters and Instruments
Specification for AC static transformer operated watt
hour and VAR hour meters class 0.2 S & 0.5 S.
Specification for AC Static Watt hour Meters, class 0.2 S
& 0.5 S.
Specification for AC Static Electrical Energy Meter.
TN-01/55
3.0
CLIMATIC CONDITIONS:
Equipment
to be supplied against
this
specification shall
be suitable for
satisfactory continuous operation under the following tropical conditions :i)Peak ambient air temperature
in shade.
ii) Minimum ambient air temperature
in shade
iii) Maximum relative humidity.
iv)Minimun relative humidity
50 DEG C
(-) 5 DEG C
95 %
10 %
v)Dust storms are liable to occur from the period
March to July
vi) Height above mean sea level
vii) Average number of thunder
storms days per annum.
viii) Average annual rainfall
ix)
4.0
less than 1000M
40 DAYS
10-100 cm
(Depending on area)
Number of months of tropical
monsoon conditions p.a.
4
PRINCIPAL PARAMETERS OF CIRCUIT BREAKERS
4.1 TYPE AND RATING
4.1.1 Type
12 kV
Vacuum circuit breaker
4.1.2 Service
4.1.3 Pole
4.1.4 Rated voltage
(nominal/max.)
4.1.5 Rated frequency
4.1.6 System Neutral
earthing
Outdoor
3
11/12 kV
50 HZ
Effectively
grounded.
4.1.7 INSULTATION LEVEL
4.1.7.1 Impulse withstand
4.1.7.2 One minute power
frequency withstand
voltage.
75 kVp
As per relevant standards.
4.1.8 Rated Current
o
4.1.8.1 Continuous at 50 C.
4.1.8.2 Short time current
for 3 Sec.
630 A
16 kA
4.1.9 Rated Breaking Capacity
4.1.9.1 Symmeterical
16 kA
TN-01/56
4.1.9.2 Asymmeterical
4.1.10
As per relevant standard
Rated making capacity
2.50X16 KA
4.1.11 Rated short time withstand current 3 secs.
4.1.12
Total break time
Closing time
4.1.13
Creepage distance
16 KA
3 cycles(Max.)
4 cycles (Max.)
300 mm
or more
4.1.14
Protection class of kiosk
IP-55 as per
IEC 529
4.1.15 Operating duty
For gang operation
O-0.3 Sec-CO-3min-CO
4.1.16
Operating Mechanism
motor operated spring
charged closing
mechanism or Magnetic
Actuator.
4.1.17
Spring charging Motor
220V-240V
4.1.17.1 Heater/Lamp/Socket.
4.1.18
Terminal Connector
4.1.18.1 Type
Bimetallic
clamp type/
Al. alloy.
4.1.18.2 Suitable for
ACSR conductor
4.2
4.2.1
240V AC
10% Panther and 90%
Dog Conductor
System details
H.V. System
Voltage (Nominal/Max.)
11/12 kV
Phases
3
System Neutral
Effectively
earthed.
Fault level
16 KA r.m.s.
Symmetrical
4.2.2
Auxiliary power Supply
4.2.2.1 A.C. Supply
1. 415 volts 3 ph 4 W 50 Hz
2. 240V 1 Ph 2 W 50 Hz
5.
GENERAL TECHNICAL REQUIREMENTS:-
5.1
DESIGN CRITERIA
The bidder shall quote 12 KV Outdoor VCB Kiosks conforming to M-2 class
only. The equipment will be used in high voltage system
as
having characteristics
listed in the specification. The equipment will be installed outdoor in a hot,
TN-01/57
humid and tropical atmosphere.
All equipment, accessories and wiring shall have
tropical protection, involving special treatment of metal and insulation against
fungus, insects and corrosion.
The maximum temperature in any part of the equipment at specified rating shall
not exceed the permissible limits as stipulated in the relevant standards.
The equipment shall be capable of withstanding the dynamic
and thermal
stresses of listed short circuit current without any damage or deterioration.
The safety clearances of all live parts of the equipment shall be as per relevant
standards.
The cowling provision shall be provided on the roof of 12 KV outdoor VCB Kiosk to
avoid direct inception of water at any joint.
5.2
SPECIFIC REQUIREMENTS
5.2.1 The
vacuum circuit breaker kiosk shall
be for outdoor installation. The duty of
the circuit breaker shall involve satisfactory interruption of short circuit currents
as listed in the specification. The breaker shall be capable
of interruption of
low reactive current (lagging/leading) without undue over voltage.
5.2.2
CONSTRUCTIONAL FEATURE
5.2.2.1
a) The
circuit breakers shall be
of CRCA sheet steel
triple pole horizontal fixed type enclosed in Kiosk
of 3 mm thickness for load bearing members and 2 mm
thickness for non-load bearing members and shall comply with latest edition of
IS:13118/3427/IEC-56. The Kiosk shall be
switchgears and
supporting
Control
frame works,
the floor. The operating
three
gears
vermin
shall
Nuts
be complete
shall be
mechanism shall operate
with all necessary
(close/open)
all
the
mechanism links etc. should be
for maintenance. The circuit breakers
and its operating mechanism
fully interlocked to prevent mal-operation. All the breakers shall be
supplied with
necessary
current ratings. Rigid
630 Amps.
dust tight. The
and bolts etc. for securing the same to
phases simultaneously. The operating
accessible
proof and
current
rating
clamps
and
connectors
suitable for
type
bimetallic/Al.alloy terminal
form
part
earthing the switchgears shall
of
appropriate
connectors
of
supply. Suitable arrangement
of
be provided. All the connecting bus bars shall be
made of copper.
b) Hinges of door shall be concealed type to avoid rusting and obstructive opening of
the door.
c) The quality of welding shall be good and there should not be any lumps and
splatters on the panel.
d) All the connecting bus bar and current carrying parts shall be made of copper.
e) All the gasket shall be of chemically treated neoprene.
f)
Hole & Pin locking (Check nut) arrangement should also be provided while fixing the
vacuum interrupter at bottom side.
TN-01/58
5.2.2.2Switchgear (Vacuum Circuit breakers
etc.)shall
be mounted on
insulated
with
the
PVC
same
density. Size
Kiosk.
Bus
insulation/sleeves
coating. The bus bars should be
of current
etc.)and control
of
specified in the tender. The
of
electrolytic
bars
gear
(CTs.,PTs,
bars
shall
relays
be
on electrostatic
air
powder
copper with permissible limits
the
bus
and current
density should be
bus
bars conductor shall conform
to
Indian
standard 8084 and 3427 and shall be rated for 630 A,STC 16 KA for 3 sec.
5.2.2.3 All the meters, instruments, relays etc. shall be mounted
kiosk. The
on
the
switchgear
outdoor circuit breakers Kiosk shall be suitable for AC shunt tripping
arrangement.
5.2.2.4The Kiosk shall have an arrangement
place in addition to
for emergency shunt tripping from remote
arrangement for local emergency tripping(Mechanical). The
kiosk shall also have a system to check
all the three
the "Trip circuit
healthy check" in
phases. Necessary trip and closing coils shall be provided for
operation of the breakers.
5.2.2.5 All
the
six
terminals shall
be
brought out
through
appropriate
class
bushings.
5.2.2.6
The arcing contacts shall
surge
voltage
be
made
are reduced
of homogeneous special alloy so that
to negligible
level
& multiple reignition
is
eliminated.
5.2.2.7
The
circuit
breaker
kiosk shall
be electrically
and mechanically trip free
under various conditions.
5.2.2.8
The provision shall be kept on the kiosk roof and roof bushing assembly to
adopt arcing horns.
5.2.2.9
The lifting arrangement shall not cause any effective loss of creepage
distance/ phase to earth clearances as specified in the ISS/IEC.
5.2.3
MAIN CONTACTS
The main contacts shall have adequate area and contact pressure for carrying
rated continuous and short time current without excessive heating liable to cause
pitting and welding.
The breakers may be provided with silver plated contacts, if necessary, to meet the
requirement of IS:13118/IEC56 where higher temperature rise is permitted with
silver plated contacts. The quantity of silver facing shall be such that after carrying
out one tenth of total number of operations specified for mechanical endurance
tests, there is still continuous layer of silver on contacts.
5.2.4 NUMBER & TYPE OF SPARE, AUXILIARY CONTACTS/ SWITCHES :
Adequate number of spare auxiliary switches/contacts both of normally open &
normally close type but not less than four each shall be provided on the circuit
breaker for use in the indication and controlling scheme of circuit breakers.
5.2.5
INTERLOCK
All
electrical
and
mechanical
interlocks
which
are necessary
satisfactory operation of the circuit breaker shall be provided .
TN-01/59
for
safe and
5.2.6
a)
BUSHINGS FOR CIRCUIT BRAKER KIOSK
The
out
door circuit breakers shall be metal
enclosed fitted with weather
proof/
suitable type bushing conforming to IS:2099 and shall be designed to have
necessary mechanical strength and rigidity required
the
and shall be free from
objectionable interference and external and internal corona. The porcelain shall be of
the wet process type, homogeneous, free from laminations and cavities or other flaws
which could effect its chemical & mechanical strength and shall not be injuriously
stressed by temperature change. The porcelain shall be thoroughly vitrified tough and
impervious to moisture and shall
be evenly glazed. The glazing shall be free from
blisters or burrs. The bushing shall be designed manufactured & tested in accordance
with latest edition of IS:2099. The
type and
characteristic data bushing shall be
clearly specified.
b) The bushing shall not be subjected to direct point loading. They shall be provided with
neck around clamps for evenly distributed pressure.
c) The bushing shall be mounted using suitable clamps and gasket arrangement to provide
required degree of protection.
d) The bushing assembly shall be provided with lock nut and check nut which will be nonmagnetic and non-corrosive.
5.2.7
OPERATING MECHANISM
Characteristics of Operating mechanism of circuit
breaker and associated
equipments :
Method of operation: The circuit breaker shall be equipped with power operated
mechanism to operate all three phases
Motor operated spring closing
be
electrically
using
220/240
V AC
mechanism or magnetic actuator type. It shall
& mechanically trip free under various conditions. Kiosk shall
also be provided with hand
Operation counter
5.2.8
simultaneously
operated
spring
charging
closing
mechanism.
and mechanically ON-OFF indicator shall be provided.
VACUUM CIRCUIT BREAKER
The three phase vacuum circuit breaker will have three vacuum interrupters (one
interrupter per phase)
insulated with
mounted on same carriage. The interrupters shall be air
epoxy resin / insulated
phase
barriers. Each interrupter shall
have fixed and moving contacts in sealed envelops
torr. The metallic
and
act as vacuum seal. The contacts shall have requisite mechanical strength
and
electrical
shall permit axial
vacuum below 10-6
movement of moving contact
good
bellow
having
and thermal conductivity
and
shall
be
made
of
copper
chromium alloy. Complete literature of vacuum bottles shall be furnished with the
tender.
In order to have safe operation under fetal conditions, the vacuum interrupter
should be housed in epoxy pole unit and make of Vacuum Interrupter will be as
“BEL, CGL, SIEMENS, ABB, ALSTOM/AREVA/MEGAWIN”.
Any other equivalent make of V.I. shall also be acceptable subject to prior approval
of S.E. (MM), JVVNL, Jaipur.
TN-01/60
5.2.9
i)
VOLTAGE TRANSFORMERS
Highest equipment voltage
ii)
: 12 KV
No. of phases.
: 3 Nos. single
phase VTs
iii)
Insulation level.
a) Impulse withstand voltage
: 75 KVP
b) One minute power frequency
withstand voltage on :
i) Primary winding
: As per relevant standard.
ii) Secondary winding
: 2 KV rms
iv)
Frequency.
: 50 Hz.
v)
Transformation ratio.
: 11000/110 V
vi)
Rated output.
: 100VA/Phase
vii)
Accuracy class.
: 0.5
viii) Rated voltage factor.
: 1.2 continuous &
1.5 for 30 sec.
ix)
Type of insulation
: Resin cast.
VTs, shall be provided with HRC type fuses on the secondary side. The VT fuses on
primary side shall
also be
provided
with
all safety precautions.
secondary terminals of the VTs, shall be solidly earthed.
Three
One
of
the
numbers single
phase voltage transformer of this rated output will be required for each circuit
breaker kiosk. Voltage transformers shall be fixed type and shall be suitable for
single phasing.
5.2.10
CURRENT TRANSFORMERS
i)
Rated voltage.
ii)
Insulation level.
a) Impulse withstand voltage
iii)
iv)
v)
: 12 KV
: 75 KVP
b) One minute power frequency
withstand voltage on :
i) Primary winding
: As per relevant standard.
ii) Secondary winding
: 2 KV rms
Frequency.
: 50 Hz.
Rated continuous thermal current: 120% of rated
primary current
Short time thermal rating
and its duration.
: 16 KA for 3 sec.
vi)
Transformation ratio of :
Core-I Core.II
CTs 400-200-100/5-5A
---------------a) Rated output
15 VA
15 VA
b) Class of accuracy
5P
0.5S
c) Accuracy limit factor.
15
d) Purpose
Relaying Metering
vii)
Max. instrument security
factor.
:-
TN-01/61
5
12 KV current transformers shall be single phase. The
ageing laminated
ensure
high
silicon steel
of
core shall be of grade non
low hysteresis loss and high
accuracy at both normal
and
permeability
to
fault current.
5.2.11 The rating of secondary winding shall be 5 Amps. Required transformers ratio can
be achieved in any manner, However, the current transformers will have to
satisfy the requirement of rated VA burden, Class of accuracy , accuracy limit
factor and short time thermal rating
as
have
been
specified
above
at
all
transformation ratio.
The rating of current transformers of all classes
regarding ratio error, knee point
voltage, resistance of secondary winding etc. shall have to be co-ordinate with the
requirement of protective relays and protection scheme without any extra cost.
5.2.12The
tenderer
shall also furnish
along with
the tender, complete general
arrangement, schematic and outline diagrams indicating the mounting arrangement
and position
of current transformers, potential transformer,
terminal block
etc.
Type of current transformers and potential transformers employed shall also be
clearly stated.
5.2.13 INDICATING AND INTERGRATING METERS/INSTRUMENTS:
All indicating instruments shall be of switch board type, back connected suitable
for flush mounting and provided with dust and vermin proof cases for tropical use
and finished in suitable colour. All instruments shall
have practical laboratory
means of adjustment of accuracy. The limits of errors for ammeters/voltmeter
shall be permissible for class 1.5 instruments as per IS:1248. The ammeters and
voltmeters shall be suitable scaled to indicate the current for all the ratings
current/voltage
be
of
transformers. A phase selector switch with four/six positions shall
used to measure
the
current/voltage of each phase. The
located at eye level to facilitate
meter
shall
be
observation of readings correctly.
Any alarm scheme shall have both audio-visual annunciations in redundancy of each
other and appropriate accept and reset push buttons shall be part of alarm scheme.
5.2.14 RELAYS :
The circuit breaker shall be fitted with numerical relay having shunt trip coil for
operation on 3 over current & one earth fault element. The numerical relay to be
provided with the 12 KV Outdoor VCB Kiosk, should be so designed so as to
operate/ trip on earth fault as well as on over current faults but should not operate
on unbalance load conditions during single phasing (which can be achieved through
residual voltage control or otherwise).
The circuit breaker shall have suitable arrangement for power supply of relay and
breaker operation through shunt trip coil using power pack. The power pack should
be suitable for 6 Nos. closing/ tripping operations and for future remote
communication as well as breaker testing during long time power failure. The output
voltage may be as per manufacturer’s design. The charging of Power pack shall be
through 230 V A.C. supply available at Sub-Station.
TN-01/62
The make, model No., type and Technical specification of the relay as well as power
pack are required to be mentioned in the bid.
The Relay & Power Pack arrangement system should be warranted for 5 years (in
line with warranty of breaker).
The numerical relays shall have following features:a. Self Diagnosis
b. Minimum last five abnormal events recording (over current & earth fault)
including fault level and phase along with date & time.
c. On-line display of current.
d. Communicable with open Protocol having RS-485 port.
e. The relay should contain four shots, three phase, programmable & auto
reclose control feature.
The relay shall be numerical type mounted in flush pattern on the panel board. The
relay should be rated for 110V AC as well as DC & 5 Amper CT secondary. The relay
should conform to latest IEC specifications. The tenders shall furnish the detail in
this regard along with the offer.
Relay TTB shall have trip bypass arrangement.
All the relays shall be provided with test blocks in panel so designed that the relays
may be tested at site. The relays should have provision of testing either through
test block or test plug easily accessible by injecting the voltage / current/frequency
(as
applicable)
from
external
testing
instruments
/source
without
first
disconnecting/ re-energizing the primary electrical circuit protected by the relays.
Facilities for isolating the tripping circuit during such testing shall also be provided.
The requirement of test block shall not be applicable in case of drawout type relays
which can be tested by using test plug without removing the relay from its casing.
The testing facilities provided in the relays shall be specifically stated in the bid.
Necessary test plug etc. as may be required for proper testing shall be included in
the contractor’s scope of supply. One test plug with five panels or part thereof are
to be supplied.
The technical suitability of relays/schemes may also be examined by Protection
Wing of Discoms & acceptability will be judged appropriately.
The bidder must furnish type test reports as per relevant ISS/ IEC along with bid
to suit the environmental conditions of our State, in respect of the relay (of the
type and design offered) which should have been type tested in NABL accredited
test laboratory in respect of such tests for which the lab has been accredited (for
Indian make Relays)/ CPRI/ Nationally accredited testing laboratory (for Foreign
make Relays).These type test reports should not be older than Five years from the
date of opening of bid.
The Following makes of Relays are acceptable:a. Areva.
b. ABB.
c. Easun Reyrolle
d. C&S
e. JVS
TN-01/63
f. SEL
g. ASHIDA
h. MEGAWIN
i. STELMEC
j. CGL
Any other equivalent make of relays shall also be acceptable subject to prior
approval of S.E. (JCC), JVVNL, Jaipur.
5.2.15
WIRING :
All
wiring shall be of switch board
type consisting of copper conductor of 2.5
sq.mm cross section insulated with polyvinyl chloride insulation suitable for 660V
service and in accordance with relevant IS:732.
Polyvinyl chloride used shall
have excellent resistance against burning, moisture, oil and vermin and shall be
finished with clear colour. Rubber insulated wiring shall not be acceptable.
Tenderers shall furnish the details of method being adopted by them for joint/
connections.
All instruments and panel wiring shall be of
heat resisting and self extinguishing
type in compliance with British Standard Practice/IS. Plastic or porcelain cleats of
the limited compression type shall be used for holding wiring runs. All wires shall be
suitable for bending to meet the terminal studs at right angles. Metal cases of all
apparatus mounted on kiosk shall be separately earthed by means of copper
wire or strips. The
following colour schemes of the wiring shall be used as per
IS:375.
a) AC three phase circuits :
i) No.1 phase
: Red
No.2 phase
: Yellow
No.3 phase
: Blue
ii) Neutral conductor : Black
iii) Connection to earth : Green
5.2.16 TERMINAL BLOCKS :
Terminal blocks shall be 650 V grade,
box
approved equal. Not more than two wires shall
clamp
be
type ELMEX 10 sq.mm or
connected to any
terminal.
Spare terminals equal in number to 20% of active terminals shall be furnished.
Terminal blocks shall be located to allow easy access. Wiring shall be so arranged
that individual wires of an external cable can be connected to consecutive terminals.
5.2.17 TEST TERMINAL BLOCK :
Two Nos. test terminal blocks shall be provided one for testing of relays and other
for testing meters. They shall be of switch board type back connected for front
of panel mounting. The test blocks
shall
provide complete
isolation of meters,
instruments etc. and the arrangement shall be such that testing power could be
connected at the test block from any external source or may be taken from the
instrument transformers.
transformers. Suitable
Provision shall be made for short circuiting current
sealing arrangement shall be provided
in
test
terminal
blocks.
5.2.18 INDICATING LAMPS :
Indicating lamps shall be provided on the control board to indicate the following:
i) Visual indication of ON and OFF position of each circuit breaker.
TN-01/64
ii) PT supply indication.
Each lamp body shall be of moulded insulation and shall be able to withstand a high
voltage test of appropriate value. All lamps shall be suitable for 240 V AC supply
and
shall have low power consumption
and
shall provide a wide angle of
illumination of sufficient intensity for comfortable viewing. A glass of appropriate
colour shall be screwed into the front of lamp body. The design of indication lamp
shall be such as to facilitate replacement of burnt lamps. An engraved label
indicating the purpose of the lamp shall be provided with each lamp.
5.2.19 FERRULES :
Ferrules engraved/printed with the same numbers, of symbols as indicated in the
connections and wiring diagram shall be provided on the terminal ends of
wires
for identification of circuits
shall be of strong
prevent
shall not
adhesion.
for inspection
and
and flexible insulating material
They
shall
maintenance. Ferrules
with glossy finish
to
be engraved/ printed and clearly marked and
be effected by dampness. Ferrule numbering shall
with IS:375. The same ferrules
all
number
shall
be in accordance
not be used on wires in different
circuits on a panel.
5.2.20 HT TVM:3
phase
4 wire A.C. Static H.T. Trivector
meter
of accuracy
class
0.5S for
measurement of energy as per latest specification of JVVNL, shall be provided on
each Outdoor VCB Kiosks.
Following makes of HT TVMs are acceptable:
i)
Secure
ii) L&T
iii) ABB/Elster
iv) Schlumberger
v) Genus Infra
Any other make being procured by Nigam shall also be acceptable.
5.2.21
All interiors and exteriors of switchgear enclosure, breaker mechanism etc shall
be finished and painted to produce a neat, fire resistant and durable surface
which would prevent rusting and corrosion. Sheet metal component shall be pretreated using 7 tank
phosphating process consisting of de-greasing, acid
pickling, de-rusting, phosphating and passivation including repeated rinsing in
between. On completion of the passivation of the components, they shall be
preheated and then epoxy powder coated or treated with one coat of primer &
zinc chromate and finished with two coats of light gray enamel paint of shade
631 of IS 5 and stoved to achieve excellent anti-rusting and scratch resistance
properties. The thickness of painting shall be around 60 microns.
5.3
SCHEDUOLE OF EQUIPMENTS, FITTING & ACCESSORIES :
12 KV 630 Amps Vacuum circuit breakers kiosks for out door installation :
5.3.1 1 No. - 12 KV 630 Amp. Vacuum
Circuit
Breaker horizontal fixed type with
provision of manual tripping by means of push button and emergency shunt
tripping.
TN-01/65
Electrically operated through 230 V AC. A lockable Local/ Remote switch shall be
provided, apart from Trip-Neutral-Close (TNC switch) control switch to select local/
remote operation of the switchgear. The breaker control switch shall have TripNeutral-Close position spring return sequence locking mechanism. The breaker
control switch and selector switch shall be mounted on the front side of cubicle and
located at a convenient height for easy operation.
5.3.2 1
No.
actuator
5.3.3
- AC Motor charged spring
operated closing mechanism or magnetic
type closing mechanism.
1 No. - Shunt tripping arrangement/ Coil for operation
and earth fault by relays along with
emergency
on over current (load)
shunt tripping from remote
place in addition to local emergency tripping(Mech.) One additional shunt trip coil,
fitted very near to the original coil (which will be unwired) is also required to be
provided.
5.3.4
3 Nos. - Single phase 12 KV Current Transformer ratio 400-200-100/5-5A suitable
for metering and protection. The class of accuracy shall be 0.5 for metering and
5P15 for protection.
Rated burden (output) shall be 15 VA for each secondary
winding and it should not be less than suitable for tripping arrangement provided.
Instrument security factor for metering core shall not be exceed 5.
5.3.5
6
Nos. - Rigid type bimetallic/ aluminium
alloy terminal connector suitable for
ACSR (10% Panther and 90% Dog Conductor) for both horizontal/ vertical takeoff.
5.3.6
1 No. - Mechanical ON/OFF indicator.
5.3.7
1 No. - Operating handle for independent manual closing mechanism.
5.3.8
1 No. - Red indicating lamp for ON indication.
5.3.9
1 No. - Green indicating lamp for OFF indication.
5.3.10 Spare auxilliary contacts/switch having
5.3.11
1
minimum 4 NO + 4 NC
No. - Flush mounting pattern 96x96
sq.mm Moving Iron ammeter of class
1.5 accuracy suitable scaled for 5 Amps. CT secondary.
5.3.12 1 No. - Ammeter selector switch to indicate phase current in all three phases and
with OFF position.
5.3.13 1 No. – Numerical 3 O/C + E/F relay.
5.3.14
1 No. HT TVM of accuracy class 0.5S as per latest specification of JVVNL.
5.3.15
2 Nos. - 240 V AC single phase 80 or 100 watt anti condensation heaters with
thermostat and switch.
5.3.16 1 No. - Automatic door illumination lamp with switch.
5.3.17
3 Nos. - 11000/110 V single phase voltage
VA/phase burden &
transformers
each having 100
class of accuracy 0.5 suitably connected to meters and
indicating instruments etc.
5.3.18 1 No. - Flush pattern switch board mounting pattern 96x96 sq. mm moving iron
AC voltmeter of class 1.5 accuracy suitable for 110 V phase to phase secondary
suitably scaled.
TN-01/66
5.3.19 1 No. - Voltmeter selector switch to indicate phase to phase & phase to neutral
voltage of all the three phases.
5.3.20 3 Nos. - Indicating lamps coloured Red, Amber Blue for PT supply.
5.3.21 2 Nos. - Test terminal blocks to test meters and relays with sealing arrangement.
5.3.22 1 No. - Blank lable on the front of kiosks at the top.
5.3.23 Door locks with keys for all doors.
5.3.24 Pair of base channel for grouting in floor.
5.3.25 Arrangement to check healthy trip circuit in all three phases (separate lamps for
R phase, Y phase and B phase) be provided.
5.3.26 1 set - Self auxiliary plug and socket.
5.3.27 1 No. - ground bus system, size 50x6mm copper may be provided and the earthing
stud shall be capable of withstanding rated short circuit current and stud design
shall be as per IS-133427 or IEC -200.
5.3.28 1 No. - Audio-Visual Annunciations.
5.3.29 1 No. - Operation counter.
5.3.30 1 No. - Name plate at front and back of each kiosk.
5.3.31 1 set - 3 phase air insulated main copper bus bar of 630 amp. continuous current
rating having maximum current density 1.5 Amp./ MM2 with minimum cross
sectional area 600 MM2 with PVC insulation or sleeves, STC rating 16 KA
for 3 sec.
5.3.32 1 Set -Power Pack arrangement system as specified in cl. No. 5.2.14.
5.3.33 1 No. -Spring Charge Indication Lamp.
The busses within the cubical shall be of high conductivity electrolyte grade
copper. The Bus bar joints shall be silver plated and bolted in such a manner
that initial contact pressure around the square headed high tensile bolt will
remain substantially undiminished at all temperature upto
rated full load
temperature. The Bus support and bushings shall be of epoxy resin cast
type. All drop off from main bus to VCB and VCB to bushing terminations
shall be suitable for current rating of circuit breaker . All the bus bar shall be
sleeved with heat shrinkable sleeves of 12 KV voltage level (Insulated for a
service voltage of 12 KV) and bus bar shall be shrouded wherever possible.
All the bus bar joints shall be shrouded and where shrouding is not possible,
it shall be taped with HV self amalgamation tape. All the tap off bus bar
connections inside panel and PT jumpers shall be sleeved with HT heat
shrinkable sleeves. Special care shall be taken in the design of bus bar
system to provide for thermal expansion and to minimize the chances of bus
fault. Bimetallic washers shall be provided at the joints of two different metal
surfaces.
The bus supports and bushings shall be non hygroscopic non aging glass
reinforced polymer.
TN-01/67
5.4
MAKE AND TYPE OF BOUGHT OUT ITEMS :
Make
/
type
instruments,
of
each
indicating
instruments,
integrating
control switch for Circuit Breaker/Trip Transfer,
for Voltmeter/Ammeter,
Push
relay,
Semaphore
Indicator, indicating
selector switch
lamps,
annunciator,
Button, A.C. Hooter/Bell, D.C. Hooter, Heater, Link Type Test
Block
for testing of TVM, CFL Tube, 2/3 Pin
clearly
and
invariably
indicated in
Particulars), bill of material
Socket
the GTP
and unit price list.
with Switch
Terminal
etc. shall be
(Guaranteed
Technical
Only specific make
accessories
shall be indicated. The word "EQUIVALENT/REPUTED
MAKE"
will
not
be
given for consideration.
The other makes of all bought out items shall be acceptable if it is of "ISI
Marked" or type tested for which
bidder shall furnish attested
copies of ISI Certificate/type test reports not
respective
Photostat
older than Five years for the
make offered, subject to prior approval of SE(MM), JVVNL, Jaipur.
Other standard accessories which are not specifically mentioned but are required
to be supplied with circuit breaker kiosk of similar type and rating for efficient
and trouble-free operation.
5.5
TEMPERATURE RISE :
The max. temperature rise of various parts of the circuit breakers when tested
under rated condition shall not exceed the specified values at a peak ambient
temperature
of
50 deg.C . The breaker may
be
provided with
silver
plated
contacts if necessary to meet the requirement of IS:13118/IEC:56 where higher
temperature rise
is
permitted
with
silver
plated
contacts.
The quantity
of
silver facing shall be such that after carrying out one tenth of the total number
of operations specified for mech. Endurance test, there is a
layer of silver on the
contacts.
still continuous
The temperature rise of CTs and PTs shall also
not exceed the permissible values as per relevant Indian standards when corrected
for max. ambient temperature at site.
6.0
TESTS :
6.1
TEST BEFORE DESPATCH : The 12 KV vacuum circuit breakers and accessories
shall be subjected at maker's works before dispatch, to the following tests as
per relevant IS/IEC.
A)
(i)
ROUTINE TESTS ON EACH UNIT AS PER RELEVANT STANDARDS
:
One minute power frequency voltage withstand dry
test on main circuit.
(ii)
Voltage withstand test on control &
auxiliary
circuits.
(iii)
Measurement of the resistance of main circuit.
(iv)
Mechanical operating test.
(v)
Design and visual checks.
B)
The following type tests shall be conducted on the material as per
relevant standards:
TN-01/68
(i)
Dielectric tests.
a) Lightning Impulse Voltage Test.
b) One Minute Power Frequency Test (Wet & Dry).
(ii)
Short time withstand current and peak withstand current test.
(iii)
Basic short circuit duties test.
(iv)
Single phase short circuit test.
(v)
Mechanical Operation test as per M-2 class.
(vi)
Out of phase making & breaking test.
(vii)
Capacitive Current Switching Test.
a) Cable Charging Test.
b) Single Capacitor Bank Current Switching Test.
(viii) Measurement of resistance of main circuit.
(ix)
Temp. rise test.
(x)
IP-55 Test (For cubicle/control cabinet).
(xi)
Any other type tests not specified above but
covered as per amendment/latest edition of
relevant IS/IEC.
C)
The
type test reports of
Circuit
Breakers,
Current
Transformers,
Potential Transformers, Relays, Meters etc. shall be complete in all respect
as per relevant IEC/ISS.
6.2
TYPE TESTS :
The 12 KV vacuum circuit breaker kiosk offered shall be fully type tested as per
relevant standards.
Where permitted in the relevant standard, a test specimen for type test may be a
representative sub-assembly/ a representative functional unit.An individual type test
is acceptable for a change of constructional detail, for any change in the design/type
of type test report and the design/type of offered against this specification, if the
manufacturer can demonstrate and purchaser is satisfied that this change does not
influence the result of the individual type test.The bidder may bring out in their offer
all such changes made in components, materials, design etc. as the case may
be.The purchaser will interpret the meanings of drawings and specifications and
shall have the power to accept/reject any type test report which in his judgment
is/is not in a manner acceptable to him. The decision of Purchase Committee in
this matter shall be final and binding to all.
However, the purchaser reserves the right to demand repetition of some or
all the type tests in presence of purchaser's representative. For this purpose,
the bidder should indicate unit rates for carrying out such type tests. These test
charges shall not be taken into consideration for bid evaluation.
6.3
TEST ON BOUGHT OUT ITEMS :
Tests are not required to be performed on bought
motor, terminal connector,
Certificate
etc.
out equipments/items
like
at the works of manufacturer. Furnishing Test
of these items from the original equipment manufacturers shall be
TN-01/69
deemed to be satisfactory evidence. Inspection of the tests at Sub-contractors
works will be arranged by the supplier whenever required.
6.4
(i)
ROUTINE/ACCEPTANCE TESTS :
The following acceptance and routine tests shall be got conducted in presence of
purchaser's representative
as
per stipulation of the relevant standards, on each
unit.
(ii)
a)
One minute power frequency voltage withstand dry test on main circuit.
b)
Voltage withstand test on control & auxiliary circuits.
c)
Measurement of the resistance of main circuit.
d)
Mechanical operating test.
e)
Design and visual checks
Inspection & tests on control gear.
In addition to the above tests at 6.4 (i) above specified by IEC, the following
shall also be performed at manufacturer's
works
in
presence
of purchaser's
representative after completely assembling the kiosk.
a)
Checking wiring of circuits and their contacts.
b)
Insulation resistance of complete wiring, circuit by circuit with all equipment
mounted on the panels.
c)
Checking of operational protective schedule , instruments and meters.
d)
Checking of phase faults between R&Y, Y&B and B&R phases. Kiosk should
trip under all three conditions.
(iii)
Temp. rise test on one No. Kiosk in the first offered lot shall also be
done in the presence of the purchaser's representative.
(iv)
Any
other tests
not
specified
above
but covered as per amendment/latest
edition of relevant IS/IEC.
6.5
TOLERANCE ON TEST RESULTS :
As per relevant standards/specification.
6.6
TEST AT SITE :
The purchaser reserves the right to conduct all tests on 12 KV circuit breakers
after arrival at site
and the
contractor
shall guarantee test
certificate
figures
under actual service conditions.
7.0
INSPECTION :
All the tests (as mentioned at Clause 6.4) and Inspection shall be made at the
place of manufacturer unless otherwise especially agreed upon by the bidder and
purchaser at the time of purchase. The bidder shall afford the inspection officer(s)
representing the purchaser all reasonable facilities without charges, to satisfy him
that the material is being furnished in accordance with this specification. The
purchaser has the right
independent
agency
to
have
whenever
the tests carried out at his own cost by an
there
is
a dispute regarding
the
quality
of
stage
of
supply.
The Inspection may be carried out by the
purchaser at
manufacture/ before despatch as per relevant standard.
TN-01/70
any
Inspection and acceptance of any material under the specification
purchaser, shall not relieve the bidder
by
the
of his obligation of furnishing material
in accordance with the specification and shall not prevent subsequent rejection if
the
material
is
found
to
be defective. The Bidder shall keep the purchaser
informed in advance, about manufacturing programme so that arrangements can be
made for inspection.
The purchaser reserves the right to insist for witnessing the acceptance/ routine
testing of the bought out items.
The
Bidder shall give 15 days advance intimation
to enable
the
purchaser
to
depute his representative for witnessing the acceptance and routine tests.
8. PACKING AND FORWARDING
8.1
The
equipments
shall
be
packed
in
crates suitable
for vertical/horizontal
transport as the case may be, and suitable to withstand handling
during
transport and outdoor storage during transit. The supplier shall be responsible
for any damage to the equipment during
inadequate packing.
transit, due
The easily damageable
and marked with the appropriate caution
the
improper
and
material shall be carefully packed
symbol.
Wherever necessary, proper
arrangement for lifting, such as lifting hooks etc. shall
material found short inside
to
packing cases
be provided.
Any
shall be supplied by supplier
without any extra cost.
8.2
Each consignment shall be accompanied with a detailed
packing
list
containing
the following information :
a) Name of the consignee.
b) Details of consignment
c) Destination
d) Total weight of consignment.
e) Sign showing upper/lower side of the crate.
f) Handling and unpacking instructions.
g) Bill of material indicating contents of each package.
8.3
The supplier shall ensure that the packing list and bill of material are approved by
the purchaser before dispatch.
9.
Optional Spares
The
bidder
shall
also recommend
optional spares that will be required for
breakers along with their total and unit prices. However, the
spares
10.0
will not
be
prices of operation
considered for bid evaluation.
PERFORMANCE WARRANTY PERIOD :
The performance warranty period shall be 5 (Five) years from the date of receipt
of equipment along with its all accessories.
TN-01/71
TECHNICAL SPECIFICATION FOR 33 KV CONTROL AND RELAY
PANELS
1.0
1.1
SCOPE :
This
specification
covers
design,
engineering, manufacture, assembly, shop
testing, inspection and testing before supply and delivery of Control and Relay Panels
for 33
KV circuits to be installed at various
33/11KV sub-stations
covered
under Rajasthan and as detailed hereunder
1.2
It is not the intent to specify completely
construction of equipment.
to
high standards of
capable
of
However, the equipment shall conform in all respects
engineering,
performing
herein all the details of the design and
design
and
workmanship
and
shall
be
in continuous commercial operation up to the Bidder's
guarantee, in a manner acceptable to the Purchaser, who will interpret the meanings
of drawings and specifications
material which, in
equipment
and
of
judgment,
the power to reject any work or
is not in accordance
shall be complete with all
trouble
scope
his
and shall have
therewith.
components necessary
for
The offered
their
effective
free operation. Such components shall be deemed to be within the
bidder's
supply irrespective
of whether those are
specifically
brought out in this specification and/or the commercial order or not.
2.0
STANDARDS :
The
Relays, associated components
and
enclosures shall
conform to the latest
issues of standards as given below, except to the extent explicitly modified in
the specification.
________________________________________________________
Indian Standard No.
Title
________________________________________________________
IS-3231
Protective Relays
IS-8686
Static protective relays
IS-1248
General requirements of indicating
and integrating meters
IS-2705/1981
Current Transformers
IS-4201/1983
Application guide for current
transformers
IS-2419
Dimensions of panel mounting and
indicating & recording instruments
IS-3156/1981
Voltage Transformers
IS-3043/1966
Code of practice for earthing
IS-8530/1977
MDI
IS-14697-1999
Specification for AC Static
Transformer operated watt hour and
VAR hour meter 0.2 S and 0.5 S.
IEC-62053-22-2003
Specification for AC Static Watt hour
IEC-62052-11-2003
meters, class 0.2 S & 0.5 S.
CBIP Technical
Specification for AC Static Electrical
Report No.88
Energy Meter.
revised July, 1996
read with amendment
issued (April,99,
September,99 and also
any other amendment
thereafter).
IS-9224
HRC cartridge fuse
TN-01/72
IS-3202
IS-345
IS-6005
Climatic proofing for electrical equipment
Code for wiring numbers
Code for practice for Phosphating, Iron and
Steel.
IS-6875
Control switches (LV switching device for
control and auxiliary circuits.)
IS-375
Marking and arrangement for switchgear
Busbar main connection and auxiliary wiring.
IS-1554
PVC insulated cable up to and including
1100 V.
IS-5578
Marking & arrangements for switchgear
IS-11353
bus bars, Main connections and auxiliary wiring.
IS-2147
Degrees of protection provided by
enclosures for low voltage switchgear
& control gear
IS-5
Colours for ready mix paints
IS-8623
Specification for low voltage switchgear
and control gear assemblies.
IS-13947
Specification for low voltage switchgear
and control gear.(Covers degree of
protection)
----------------------------------------------------------2.1
In case equipment conforms to other International standards which ensure
equivalent or better
performance
than that specified under clause 2.0
the English version of such standards or the
relevant
extracts
then
of the same
shall be forwarded with the bid and the salient features of comparison shall be
brought out separately in additional information schedule.
3.0
3.1
SERVICE CONDITIONS:
Climatic Conditions:
The equipment to be supplied against this specification shall
be suitable for
satisfactory continuous operation under the following tropical conditions:
i)
ii)
Location
Maximum ambient air
temperature ( deg C)
in shade
iii) Minimum ambient air
temperature (deg C)
iv)
Average daily ambient
air temperature (deg C)
v)
Max. yearly weighted
ambient temperature (deg C)
vi)
Max. relative humidity
vii) Max. altitude above mean
sea level (Metres)
viii) Average annual rainfall (mm)
xi)
Max. wind pressure (Kg/Sq.mt)
x)
Isoceraunic level (days/year)
xi)
In state of Rajasthan
50 deg C
-5 deg C
45 deg C
35 deg C
100%
Varies from
61 Mts. to 815 Mts
15 cm to 100 cm
195
4 Months
(June to Sept)
0.3 g
Seismic level (Horizontal
Acceleration)
NOTE:
Hot and humid tropical climate is conducive
The climatic conditions are
conditions. Smoke is also
also prone
to rust and fungus growth.
to wide variations in ambient
present in the atmosphere. Heavy Lightning
also occurs during June to October.
TN-01/73
3.2
Auxiliary Power Supply :
Auxiliary electrical equipment shall be suitable for operation on the following supply
system:
a)
AC Supply
b)
D.C. Alarm, control
415 V, 3 Phase 4 wire
50 HZ, neutral grounded AC supply
(230 V single phase)
110 VDC,2 wire.
and protective device
Each of the foregoing supplies shall be made available by the Purchaser at the
terminal
point
for
each
equipment.
Bidders
boxes etc.
The above
board for operation of relays/switches and
scope
include supply of
supply
voltage
interconnecting
auxiliary
cables, terminal
may vary as below and all devices shall
be suitable for continuous operation over entire range of voltages.
4.0
i) AC supply: Voltage +/- 10% frequency +/- 5%
ii) DC supply: -15% to +10%
PRINCIPAL PARAMETERS :
4.01
The C&R panels, required at various sub
stations can
be
broadly classified into
following categories of panels :
------------------------------------------------------------------------S.No.
Particulars.
Type of panels
Simplex
Duplex.
------------------------------------------------------------------------1. 33 KV C&R panel for controlling
(a)HV side of 2 Nos. )
A
of 33/11 KV
)
transformers
)
2.
33 KV C&R panels for controlling
B
2 nos. 33 KV feeder circuits.
-------------------------------------------------------------------------
4.02
The requirement of various sub stations will comprise
of one or more of these
panels. The simplex panel shall be complete in itself and provided with doors at
the back, while the Duplex panels shall be with end doors which shall be provided
only with transformer panels. The various panels shall generally be equipped
as per Schedule-A.
Statement showing CT ratio their technical particulars and
instrument ranges to be provided at various sub-stations are placed at annexure
I & II. Statement showing ratio of voltage transformers and capacitive voltage
transformers
proposed
to be provided at various sub stations is
placed at
Annexure. III.
5.0
GENERAL TECHNICAL REQUIREMENT :
5.01
This specification cover the design,
inspection and testing
engineering, manufacture,
before supply and delivery of control and
duly mounted with protective relays, metering equipments
the
satisfactory
operation
of radial
and
assembly,
relay board
etc. required
interconnected
33
KV
for
lines,
Bus couplers and 33KV side of 33/11KV Power Transformer at various 33/11KV
grid sub stations
included in
the specification to the satisfaction of purchaser.
TN-01/74
5.02
The intention of the specification is to provide protective
equipments
on
control
boards
relaying & metering
enumerated in the specification and to be
complete in every respect for the functions designated. It is required
the
supplier, in accepting
the
contract, agrees
to
that
furnish all apparatus,
appliances and material whether specifically mentioned or not but which may be
found necessary to complete or test any of the herein specified
schemes in compliance with
any
5.03.01
protective
the requirements of the specification without
extra charges.
Considerations
may
be
given
considers advisable by reasons of
to
his
alternatives which
the
own
requirements
manufacturing
and experience, provided descriptive literature
commended device
or arrangement
as
is submitted pointing
equal to, or
superior
supplier
out
to
the
that
required by the accompanying specifications.
5.03.02
The each supplier/tenderer should indicate the list of recommended spares
and relays which should be purchased
(i.e.P.S. module, spare
relays
and
contacts, tripping relays).
5.03.03
Each supplier/tenderer should also
indicate
the list
of
test kits and test
accessories required to test their relays which should be purchased.
5.03.04
The supplier will give training at the works for the
supplied first time
relays which are being
to protection engineers free of cost and assist them in field
for commissioning of these schemes (First five) free of cost.
5.04
RELAYING REQUIREMENTS :
5.04.01
The relay offered by the supplier shall comply with the requirements of latest
issue of ISS:3231 & IS:8686
operation in
or relevant BSS or IEC and shall be suitable for
the climatic conditions specified under clause
3.1
of
this
specification . If complying with a specification other than BSS/ISS/IEC then
an English translation of the same shall accompany the tender.
5.04.02
Each relay shall be provided with dust tight, removable covers with glass/clear
plastic windows. The relay shall be so arranged that on opening the case, it
shall be impossible for any dust which may have collected in or upon the case,
to fall on the relay mechanism. The operation of the relays shall be practically
free
from
errors
due to normal variation in frequency and wave
form
and
from ambient temperature effects between (-) 5 deg. C to 50 deg.C.
5.04.03
All relay voltage current coils/elements
maximum possible
thermal
and
shall be
mechanical
able to
stresses
withstand the
likely
to
be
encountered
in service, without damaging the coil/element and mechanical
parts.
relay
Each
coil/elements
shall
be
vacuum impregnated with an
insulating compound and shall be heat and moisture resistant. The continuous
electrical rating of all the coils shall be 110%.
5.04.04
The volt ampere burden of the relay coils shall be
low and, as per the best
modern design, shall be such that the setting and calibration will not easily get
TN-01/75
out of adjustment.
All contacts shall preferably be made of
pure silver
and
shall be readily renewable and self cleaning type.
5.04.05
Time delay features which depend upon dash pots or other devices which are
appreciably effected by
change in
temperature or humidity will not be
acceptable. Permanent magnets shall be non ageing type.
5.04.06
Terminal blocks shall have bases and
barriers moulded integrally with brass
inserts and shall be suitable for 660 volts service, individual studs or screws
with retainer type washer for terminals shall be provided for each incoming and
outgoing feeders.
5.04.07
All fault detecting relays shall be equipped with
phase relays with separate
operation indicators. In three
elements, each phase shall
have
separate
indicator.
5.04.08 Annunciation and alarm circuits shall be operated by contacts on an auxiliary
tripping relay or by a separate relay added for that purpose. All tripping shall
be done by auxiliary tripping relays fed from separate D.C. source thereby
providing isolation of the relaying circuits rom
sources.
Auxiliary
specification
the circuit breaker D.C. control
tripping relays for all protections included in this
shall be hand reset type.
winding temperature trip, oil
Transformer
temperature trip,
auxiliary protection
like
Buchholz trip/alarm and Oil
surge trip shall be through auxiliary relays.
5.04.09
All the relays shall be provided with test blocks in panel so designed that the
relays may be tested in situ.
The relays should have provision of testing
either through test block or test plug easily accessible by injecting
the
voltage/current/frequency (as applicable) from external testing instruments /
source
without
first disconnecting / reenergizing the primary electrical circuit
protected by the relays. Facilities for isolating the tripping
such testing shall be
not
also provided. The
circuit during
requirement of test block shall
be applicable in case of drawout type relays which can be tested by
using test plug without removing the relay from its casing. Relay TTB shall have
trip bypass arrangement. The testing facilities provided in the relays shall be
specifically stated in the bid. Necessary test plug etc. as may be required
for proper testing shall be included in the contractor's scope of supply.
One
test plug with five panels or part thereof are to be supplied.
5.04.10
All relays shall be suitable for 5 Amps.
rated
secondary voltage of 110/Root 3 volts
between
non-directional polarization
C.T.
secondary
phase and
current and
neutral.
for earth fault shall, however, be rated
The
for 110V.
The normal frequency will be 50 cycles per second.
5.04.11
All devices required for correct operation of each relay shall be provided by the
supplier without extra cost.
5.04.12
For over current & earth Fault protection, only numerical relay shall be provided.
In three phase protection relay, the setting for over-current element shall be 50-
TN-01/76
200% (in step of 10%) and for earth fault element from 10 to 80% (in step of
10%). The numerical relay shall have following features:a. Self Diagnosis
b. Minimum last five abnormal events recording (over current & earth
fault) including fault level and phase along with date & time.
c. On-line display of current.
d. Communicable with open Protocol having RS-485 port.
e. The relay should contain four shots, three phase, programmable &
auto reclose control feature. The auto reclosing control feature shall
only be provided for the 33 KV Feeder Type C&R Panel only.
5.04.13
Based on the results of comprehensive test,
the tenderer
shall declare the
performance of the protective system in terms of the following :
5.04.14
i) Fault setting.
ii) Time of operation.
iii) Stability limit.
The bidder must furnish type test reports as per relevant ISS/ IEC along with
bid to suit the environmental conditions of our State, in respect of the relay (of
the type and
design
offered)
which should have been type tested in NABL
accredited test laboratory in respect of such tests for which the lab has been
accredited
(for Indian make Relays)/ CPRI/ Nationally accredited testing
laboratory (for Foreign make Relays).
These type test reports should not be
older than three years from the date of opening of bid. Bids without Type Test
reports will be treated as Non-Responsive.
5.04.15
MAKE OF RELAYS
The following make of relays are acceptable to Nigam:i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
ix)
x)
AREVA
ABB
EASUN REYROLLE
JVS
SEL
ASHIDA
C&S
MEGAWIN
CGL
STELMEC
Any other equivalent make of Relay shall be acceptable subject to prior approval of
this office.
5.05
PROTECTION FOR 33 KV SYSTEM :
5.05.1 INCOMER (HV side of 33/11 KV transformer)
Protection will be provided on 33 KV incomer which includes four pole IDMTL
non directional
inverse
time combined over current & earth fault relay
instantaneous attachment with stabilizing resistance.
5.05.2 FEEDER PROTECTION
TN-01/77
with
Protection
of 33 KV feeder circuits
against
pole IDMTL non directional inverse time
with
5.06
line faults
shall be met by four
combined over current & earth fault relay
instantaneous attachment.
FAULT/TROUBLE ALARM ANNUNCIATION SCHEME :
5.06.01
Each C/R panel shall be equipped with
the annunciations
details
given
required
for
Annunciation scheme for indicating
the
trip
and
non-trip
hereunder. Each annunciation shall be
alarms
all
as
per
clearly labelled to
indicate the nature of particular annunciation.
5. 06.02
The following switches shall be provided with the annunciator :
i) A common push button switch near the annunciator unit which when pressed shall
cancel the audible alarm
indication
by means
of
the
alarm
lamps incorporated in the control switch
cancellation relay.
The
shall remain illuminated, but
shall change from flashing to steady glow.
ii)A
common
reset push button shall
be
provided.
By pushing this button,
annunciation shall be restored to the normal condition. The lamp
incorporated in
the control switch should not glow after resetting all the protection devices.
iii)A test push button switch shall be provided to illuminate all the lamps of the
associated group. As long as the test switch is held in pressed position all the
lamps shall remain illuminated.
5.06.03
Necessary auxiliary relays shall be provided
indicate each trip
in the
annunciator
scheme
to
alarm individually .Each alarm whether trip or nontrip shall
have visual as well as audible annunciation.
5.06.04
The visual annunciator alarm shall be in the form of flashing display type glow
pattern. The illuminated facias with inscription on the glass transducent plastic to
indicate the operation of particular protection device shall be provided. The
window shall remain illuminated till the particular initiating contact is reset.
5.06.05
As regards the audible indication, the automatic trip of the circuit breaker due to
the
operation
of protection
relays
shall
be indicated by
sounding
of
a
hooter. All non trip alarms shall be indicated by an alarm bell/ electronic bell.
5.06.06
33 KV Feeder circuits
Following trip/Non trip alarm shall be provided on each panel controlling two
33 KV feeder circuits.
Trip
5.06.07
i) Over current Feeder I trip.
ii) Earth fault Feeder I trip.
iii) Over current Feeder II trip.
iv) Earth fault Feeder II trip.
Non trip
i) Trip circuit Feeder I faulty.
ii) Trip circuit Feeder II faulty.
33 KV Transformer
Following trip/Non trip alarm shall be provided on each panel controlling 2
Nos. 33 KV
Transformer
circuits.
Trip
TN-01/78
5.06.08
i) Over current HV trip Transformer 1.
ii) Earth fault HV trip Transformer 1.
iii) Over current HV trip Transformer 2.
iv) earth fault HV trip Transformer 2.
v) Buchholz alarm Transformer 1
vi) Buchholz alarm Transformer 2
vii) Buchholz trip Transformer 1
viii)Buchholz trip Transformer 2
ix) Oil temperature trip Transformer 1
x) Oil temperature trip Transformer 2
xi) Winding temperature trip Transformer 1
xii) Winding temperature trip Transformer 2
xiii)Oil surge relay trip Transformer 1
xiv) Oil surge relay trip Transformer 2
Non trip
i) Trip circuit faulty Transformer 1.
ii) Trip circuit faulty Transformer 2.
iii) Minimum oil guage Transformer 1.
iv) Minimum oil guage Transformer 2.
v) Oil temperature alarm Transformer 1.
vi) Oil temperature alarm Transformer 2.
vii) Winding temperature alarm Transformer 1.
viii)Winding temperature alarm Transformer 2.
ix) D.C. under Voltage alarm Transformer 1.
x) D.C. under Voltage alarm Transformer 2.
It will be responsibility of the supplier to provide all the alarms and annunciation
equipments required for
General
the safe and efficient operation of the sub
description of the alarms required are
given
but the
stations.
supplier shall
include other alarms that he considers necessary.
5.07
SPECIFICATION OF INDICATING AND INTEGRATING INSTRUMENTS AND
METERS :
5.07.01
All indicating instruments shall be of switch board type back connected suitable
for flush mounting
use and
with dust and vermin proof case for tropical
finished in black colour. All fixing screws, nuts
shall be designed
Voltmeters,
square
and provided
according
HT Trivector
pattern
IS:2419/1963.
Meters,
and shall
Energy
to
relevant Indian
as well
as
and threaded
Standards.
conform
Ammeters,
power factor meters shall be
conform to the provisions of the latest
meters shall
parts
to
edition
of
the provisions of relevant
IS amended upto date.
All instruments shall have practical means of adjustment of accuracy. The
limits of errors for ammeters, voltmeters, Power factor meters and watt meters
shall
be those permissible for class.1 instruments of switch board type given
in IS:1248. The energy meters shall however conform to class.0.5S accuracy.
The calibration of the instruments shall function satisfactorily when mounted
on steel
panels or alternatively
magnetically
shielded instruments shall be
used.
5.07.02
AMMETERS AND VOLT METERS :
All ammeters and voltmeters shall be of moving iron
spring controlled
type.
Ammeters shall be provided in all the individual feeder panels and transformer
control panels to indicate the current in all the phases. The ammeters shall be
suitably
scaled to indicate the current
TN-01/79
for
all
the ratios
of
current
transformers.
A
phase
selector
witch
with four position shall be used
to measure the current in all the three phases and in the fourth position the
ammeters shall be out of circuit. The voltmeters shall be provided wherever
asked for in the detailed equipment requirement. A phase selector switch with
six positions shall be used to indicate the voltage between phases and between
phases and earth.
5.07.03
A.C. STATIC H.T. TRIVECTOR METERS :
A.C. Static H.T. Trivector Meter shall be as per latest specification of JVVNL.
The meters
shall be
located
at
eye level
to
facilitate
observations
of
readings correctly.
Purchaser reserves the right to get energy meters separately purchased from
other source, installed on the control
and relay panels to be supplied by the
tenderer under this contract. In that event duly blanked cutout with mounting
arrangement and wiring shall be provided on the control
per details furnished
and
relay panels as
by the purchaser. The price of the control and relay
panel shall be reduced corresponding to the unit price given in the tender.
5.07.04 TESTING BLOCKS :
Testing terminals shall be provided for carrying out calibration tests on Energy
meters, without disconnecting
the connecting
leads
or removing the meters.
The test plug shall be so arranged that when the testing respectable are fitted,
the current and voltage are automatically
disconnected
from
the source and
injection from the separate source is possible.
5.07.05
Unit prices of each metering and
indicating instruments
shall be given in the
schedule of prices. For making adjustments in the panel mountings depending
upon exact system requirement.
5.08
SPECIFICATION OF CONTROL AND RELAY BOARD
5.08.01 The
equipment
equivalent
IEC
offered
should
standards.
specifications wherever
conform
The
to relevant
references
of the
Indian standards or
relevant
mentioned in the text of this specification
given accordingly. Other authoritative standards which ensure
an
standard
have been
equal
or
better quality than the standards specified will also be accepted.
5.08.02 The Boards shall comprise of cubicles placed side by side to form continuous
boards. The duplex type shall be mounted back to back and so arranged as to
have a covered corridor in between to provide access to the internal wiring.
Hinged lockable access doors shall be fitted at both ends of the corridor and
switch
boards interior
shall
be automatically lit by
the
opening
of these
doors. The control boards for the same line voltages at each sub-station shall
be placed side by side.
5.08.03 For the existing sub stations the tendered shall ensure the matching of control
& relay boards with the existing ones. The complete details of the existing
control & relay panels shall be supplied to the
following points shall be particularly coordinated.
TN-01/80
successful
tenderer.
The
i)
The height and depth of the panel shall be perfectly matched.
ii)
Colour of panels both on exterior and interior shall be matched.
iii)Size and appearance of instruments, control switches and indicating lamps
mounted on the front of the panels shall be matched with the existing ones to
the extent possible.
iv)
The size, colour and disposition of the mimic diagram shall be perfectly
matched with the existing scheme.
5.08.04
For other new sub stations, access doors with concealed hinges having a swing
of not less than 1050 mm on full opening of their position shall be provided at
suit-able
locations. The equipment specified shall be
manner set out and where not set out, to
manufactured
in the
the reasonable satisfaction of the
purchaser.
5.08.05
The control and relay cubicles shall be of folded type construction. The front
panels, base frame
and door
frame shall be manufactured from CRCA sheet
steel 10 SWG (3mm) thick, while the side panels, roof and doors shall be
manufactured out of 14 SWG (2mm) thick CRCA sheet steel. The bottom of the
cubicle frame shall
spaced
be
suitable for erection on flush concrete
floor. Evenly
grout bolts projecting through the base channels forming members of
the frame shall be used for securing cubicles to the floor. The dimensions of
control and relay panels where
no specific matching is required shall be as
follows :
Height
: 2312 mm (inclusive of base channel height of 102 mm).
Width
: 750 mm or suitable to accommodate date equipments Depth
Duplex panel.
: 610+762+610 mm (Corridor width is 762 mm).
Simplex panel.
: 610 mm
5.08.06 The front panels of all the cubicles shall be detachable and all inter connections
from the control to the relay cubicles and vice verse shall be through terminal
connectors.
The
inter connections
shall
preferably
run underneath the top
cover. In order to avoid sectionalizing the leads at two points, the top cover may
be provided with hinges on the part.
5.08.07 The complete switch board shall be dust and vermin proof and shall be suitable
for tropical use. All holes and extension windows in the panels shall be blanked
and
access doors shall be lined with compressible line
at the
edges.
The
complete boards shall incorporate all necessary meters, instruments, relays,
control
switches, indicating
horizontal
and vertical wiring supports,
system, terminal blocks,
heaters,
In the
make
lamps, mimic buses, audible and visual
cable glands,
automatic maphore
earth
bars, interior
alarms,
lighting
fuses, labels, cleats, ferrules, space
indicators
and
other necessary equipment.
relay panels, it will be the responsibility of the supplier
provisions
for
the
leads
to
scheme for different trip and non trip
be
connected
to
the
annunciator
alarms. The enclosure shall provide a
minimum degree of protection equivalent to IP51 in accordance to IS2147.
TN-01/81
to
5.08.08 All power and control cables will be connected in separate distributing trenches
running immediately, underneath the control & relay panels. The cables will
branch off into each cubicle through entry holes in the concrete floor opening
in the bottoms of the cubicles. The tenderer shall mark the details of the cable
entry holes, glands and position of grouting bolts to enable the purchaser to
prepare foundations with pockets for grouting bolts while casting floor.
5.08.09 PAINTING :
All unfinished surfaces of steel panels and frame work shall be sand blasted
to remove rust, scale, foreign adhering matter and grease.A suitable rust
resisting primer shall be applied on the interior and exterior surface of steel,
which shall be followed by application of an under coat suitable to serve as base
and binder for the finishing coat.
I)
All sheet steel work shall be phosphated in accordance with IS:6005 code
of practice for phosphating iron and steel.
II)
Oil, grease, dirt and swarf shall be thoroughly removed by emulsion leaning.
III)
Rust and scale shall be removed by pickling with dilute acid followed by
washing with running water
rinsing with slightly alkaline hot water and
drying.
IV)
After phosphating thorough rinsing shall be carried out with clean water
followed by final rinsing with dilute dichromate solution and oven drying.
V)
The phosphate coating shall be sealed with application of two coats of
ready mixed, stoved type zinc chromate primer. The first coat may be "flash
dried" while second coat shall be stoved.
VI)
After application of primer two coats
of finishing synthetic enamel paint
shall be applied. Each coat shall be applied followed by stoving the second
coat after inspection of first coat of painting. Generally the exterior colour
of paint shall be as per shade 631
of IS5, except where specific matching
is required.
VII)
Each of coat of primer and finished paint shall be of slightly different shade
to enable inspection of painting.
VIII)
In case the tenderer proposes to follow any other established painting
procedure
like
electrostatic painting, the procedure shall be submitted
along with the tender for purchaser's review and approval.
5.08.10
PANEL WIRING :
5.08.10.1 All wiring other than for annunciation circuits shall be of switch board type
2.5
sq.mm
conductor
PVC
insulated
Indian Standards. For annunciation and alarm circuits, the wiring will
be done
chloride
sq.mm
used
PVC
shall
and vermin and shall
and
in
conductor/ Copper
relevant
1.5
660V service
copper
with
with
suitable for
multi strand tinned
accordance
insulated multi strand
have
excellent resistance
be
finished
wiring shall not be acceptable.
TN-01/82
with
copper conductor. Polyvinyl
against burning, moisture, oil
clear
colour.
Rubber insulated
5.08.10.2 The wiring shall be supported by plastic cleats/PVC channels. Wires shall be
terminated on to the terminal blocks with annealed and tinned (not soldered)
crimp tag termination, seperate termination being used for each wire, and the
size of termination suited to the size of wire terminated. Wiring shall in general
be accommodated on the sides of the cubicles and the wires for each circuit shall
be separately grouped.
5.08.10.3Wires shall not be jointed or tied between terminated points. At the terminal
connections, washers shall be interposed between terminals and holding nuts. All
holding nuts shall be secured by locking nuts. The connecting studs shall be
secured by locking nuts. the connecting studs shall project at least 6 mm from
the lock nuts surface.\
5.08.10.4Bus wires shall be fully insulated and run separately. Fuses and links shall be
provided to enable all circuits in a panel except lighting circuit to be
from
the bus wire. Whenever practicable all
circuits
in which
isolated
the voltage
exceeds 125 volts, shall be kept physically separated from the remaining wiring.
The function
of each
circuit
shall be marked on the
associated
terminal
boards.
5.08.10.5All wiring diagrams for the control and relay Boards shall be drawn as viewed
from the back of the cubicles and shall be in accordance with the relevant I.S.
5.08.10.6Wiring connected to the space heaters in the cubicle shall have porcelain beaded
insulation over a safe length from the heater terminals
5.08.10.7All wiring inter connecting the front
boards over the
corridors
panels with the rear panels of the switch
access shall be wired in gutters held against the ceiling of
by means of screws. As the front and the back
detachable,
the interconnection
shall
be
panels will
be
made through suitable terminal
connectors securely fixed on the panel.
5.08.10.8All voltage bus wiring ,audible and
non audible alarm bus wiring, A C & D C
control supply, bus wiring for panel lighting and such other wiring which runs
from panel to panel within the switch board shall be laid out in gutters and shall
be suitably screened.
5.08.10.9All wire shall be suitable for bending to meet the terminal studs at right angle
with the studs and they shall not be skewed .Metal cases of all apparatus
mounted on panels shall be separately earthed by means of flexible copper wire
or strip.
5.08.10.10The following colour scheme of the wiring shall be used :
i) A.C. three phase circuits
No. 1 Phase
No. 2 Phase
No. 3 Phase
ii) Neutral Conductor
iii) Connections to earth
iv) D.C. circuits
Colour
Red
Yellow
Blue
Black
Green
Grey
5.08.11FERRULES :
TN-01/83
5.08.11.1Ferrules engraved with the same numbers, letters and symbols as indicated in
the connection and wiring diagrams shall be provided on the terminal ends of
all wires for easy identification of circuits for inspection and maintenance.
5.08.11.2Ferrules shall be of strong and flexible insulating material with glossy finish to
prevent adhesion.
They
shall
be
engraved
and
clearly
and
durably
marked and shall not be affected by dampness.
5.08.11.3Ferrules numbering shall be in accordance with IS:375/1963. The same ferrule
number shall not be used on wires in different circuits on a panel.
5.08.11.4All
points of interconnection
equipments
not
for
different
between
the wiring
suppliers, where
a
carried
change
of
out
number
for
can
be avoided, double ferrules shall be provided on each wire with appropriate
numbers on the changing end. The change of numbering shall be shown on
the appropriate connection wiring diagram of the equipment.
5.08.11.5
Alternatively marking of the wires may be done with legible numbers painted
on the wires.
5.08.12
TERMINAL BLOCKS :
5.08.12.1Terminal block connectors built from cells of moulded dielectric and brass stud
inserts shall be provided for terminating the outgoing ends of the panel wiring
and
the
corresponding
incoming tail ends of
control
cables.
Insulating
barrier shall be provided between adjacent connections .The height of the
barriers and the spacing between terminals shall be such as to give adequate
protection while allowing easy access to terminals. Provision shall be made on
each pillar for holding 10% extra connections. All blocks shall be shrouded by
easily
removable shrouds of non inflammable moulded and transparent
dielectric materials.
5.08.12.2The terminal blocks shall be suitable for 660 volts service and for connection
with copper wires.
5.08.12.3Terminal blocks shall be mounted in such a manner as to afford easy access to
terminations and to enable ferrule number to be read without difficulty. Wire
ends shall be so connected to the terminals that no wire terminal number gets
marked due to succeeding connections. In other words ferrule numbering at the
terminals should be unambiguous and fool proof. Terminal board rows shall be
adequately spaced and shall not be less than 100 mm apart so
convenient access
to
wires
as
to permit
and terminals. Lables in the form of engraved
plastic plates shall be provided on the fixed portion of terminal boards.
5.08.12.4 No live metal parts shall be exposed at the back of the terminal boards.
5.08.12.5
All studs, nuts, bolts screws etc. shall
be threaded according to the latest
relevant Indian or equivalent International Standards.
5.08.13
SPACE HEATERS :
Tubular/Rectangular space heaters suitable for connection to the single phase
230 volts A.C. supply complete with switches located at convenient positions
shall be provided at
the bottom
of each cubicle to prevent condensation
TN-01/84
of
moisture. The Watt loss per unit surface of heater shall be low enough to
keep surface
temperature well below risible heat. Each cubicle shall also be
provided with a switch of appropriate rating for control for space heater.
5.08.14
MIMIC DIAGRAM.
Painted
colour bands shall be used for the mimic bus.
The
Width of mimic
diagram and its colour shall be matched with the existing panel. The mimic shall
represent a single line arrangement
The
of the station switch Yard equipment.
colour for showing the 33 KV voltage on the mimic shall be sed as green.
However where specific matching is not required the color scheme for mimic
shall be as under :
33 KV - Brilliant Green - Shade 221 of IS 5
11 KV - Signal Red - Shade 537 of IS 5.
The mimic diagram shall be at the eye level.
5.08.15. SEMAPHORE INDICATORS
Automatic ,rotating disc type semaphore indicators
for indication of 'Close' and
'open' position of circuit breakers,
earth
isolators and
incorporated in the mimic diagram. Other
voltage Transformers
The
etc. shall
equipments such as
and shall be operated from 110
voltage.
The
the
Semaphore
shall
be
transformers,
be represented by suitable symbols.
operating coils of the semaphore indicators
satisfactorily between
switches
limits
volts
of
shall be continuously rated
D.C. The
80
to
disc shall have a
120
90
units
percent
will
of
degree angular
operate
rated D.C.
movement
clock wise/counter clock wise to show on/off position of the equipment.
5.08.16 INDICATING LAMPS.:
5.08.16.1Indicating
lamps shall be provided
on
the control Board to indicate the
following:
i) Visual indication of 'on' and 'off position of each circuit breaker.
ii) Auto trip indication for each circuit breaker.
iii) Spring charged indication for circuit breaker.
iv) V.T. supply indication on one part of the Panel.
5.08.16.2Each lamp body shall be of moulded insulation and shall
a high voltage
volts
of appropriate value. All lamps shall be suitable for 110
D.C. supply
provide
be able to withstand
and shall
have low
a wide angle of illumination of
wattage
sufficient
of consumption and shall
intensity
for comfortable
viewing.
5.08.16.3 The `on' and `Off' position indication
lamps shall operate at 230 V Single
phase A.C. supply. Automatic change over contactor for changing the 'on'
and 'off' position indication lamps from A.C. supply to D.C. supply
shall be
provided to keep the lamps in working condition in case of failure of AC supply.
Suitable ,IVT shall be added wherever there is voltage difference between AC/DC
supply.
TN-01/85
5.08.16.4A glass of appropriate colour shall be screwed into the front of the lamps
body. The design of the indication
lamps
shall be such as
burnt lamps. An engraved label indicating the purpose
provided with each
lamp.The
lenses to enable the
tenderer shall quote
to
facilitate
of the lamp
shall be
unit prices for lamps and
purchaser to order certain spare quantity along with
the main panels.
5.08.17 SWITCH BOARD LIGHTING :
The
switch Board interiors shall be illuminated by
connected
to
a
230
interior shall be free
strain
Volts
single
from hand
phase
incandescent
A.C. Supply. The illumination of
shadows and shall be planned to avoid any
or fatigue to the wireman who may be called upon to do work. A door
operated button switch shall be provided for control of
entrances of corridor of
cubicle
lamps
shall
have its
duplex
C&R panels. In
lighting
on both
case of simplex panels each
own interior illumination lamp operated by
respective
door switch.
5.08.18
TRIP CIRCUIT SUPERVISION :
For continuous supervision of the trip circuits, continuous trip circuit supervision
relay shall
be
failure of
installed.
The relay shall operate self reset alarm contact for
trip supply and open circuit of trip coil or trip circuit wiring. The
relay shall monitor the trip circuit in both close and open position of the circuit
breakers.
5.08.19 TITLE PLATES :
A title plate bearing the name and purpose of each panel shall be fixed on the
top of each control as well as relay panel.
5.08.20 TEST BLOCKS :
Switch board type back connected test blocks with contacts shall be provided
with links or other devices for shorting terminals of CT leads before interrupting
the normal
instruments
circuit for injection from an external source or for inserting testing
in the circuit without
voltage testing studs
shall
causing
open circuit
of
the
CT.
The
preferably be housed in the narrow recesses of
the block moulding insulation to prevent accidental short circuit across the
studs. All test blocks for metering and
shall be of flush
mounting
pattern
the relays etc. whenever required,
and
the number of test blocks being
provided on each control and relay panel shall be stated in the tender.
5.08.21 SAFETY EARTHING :
Earthing of current free metallic parts or metallic
mounted on the switch boards shall
bodies of
the
equipments
be done with 2.5 sq.mm PVC insulated
green coloured copper wire. The two ends of this line shall be provided with
crimp tag terminations and connected to a tinned copper earth bar of 25mm x
3mm section running longitudinally
at the bottom of the control Board. The
neutral point of star connected secondary winding of instrument transformers
and one corner of the open delta connected LV side of voltage transformers, if
TN-01/86
used, shall be similarly earthed by tails connected with the main earth bar at the
switch board earthing system. Multiple earthing of any instrument transformer
circuit shall be avoided.
5.09
CO-ORDINATION :
5.09.01 Circuit Breaker, current transformers,
switches, H.T. TVM
carrier
voltage
equipment etc.,
transformers, CVTs, isolating
are being purchased from other
suppliers and wiring diagrams of these equipments shall be furnished by the
respective
suppliers. Supplier
responsible
for
of
control
preparing complete
wiring
and relay
boards shall
be
diagrams and cable schedules
including the control circuits of various equipments and shall also undertake
to mount and wire any equipment received loose from other suppliers.
5.09.02
The control and relay board shall be suitably fabricated to match and arranged
to form
one
continuous board
with
the existing panels at
various
sub
stations wherever mentioned.
5.09.03 The feeder protection schemes proposed to be provided shall be co ordinated
with the existing protection at
the
remote end of the section.
The
other
protection schemes, wherever asked for, shall be suitably co ordinated with the
existing protection at the various
sub
stations. Other
coordination
work
if
required, will also be done without any extra cost by the supplier of control and
relay boards
5.09.04 The supplier shall be solely responsible to propose/select
frequency for
our existing
carrier aided protection
the suitable carrier
schemes, meeting the requirement
systems and arrange allocation of frequency
of
from the wireless
advisor, Govt. of India. All relays/associated equipments shall be supplied as
per frequency finally approved allocated by the wireless advisor Govt. of India
accordingly.
6.0
6.1
TESTS :
TEST BEFORE DESPATCH : The Control & relay Panels and accessories shall be
subjected at maker's works before dispatch, to the following tests as per ISS.
A)
ROUTINE TEST ON EACH UNIT AS PER RELEVANT STANDARD IS 8623-1977 :
1) Inspection of wiring & electrical operation test.
2) Dielectric Test.
3) Checking
of
protective measures
&
of
electrical continuity of the
protective circuit.
6.2
TYPE TESTS :
The 33 KV C&R Panel offered shall be fully type tested as per relevant standards.
However, the purchaser reserves the right to demand repetition of some or all
the type tests in presence of purchaser’s representative. For this purpose, the
bidder should indicate unit rates for carrying out such type tests. These test
charges shall not be taken into consideration for bid evaluation.
6.2.2 A) TYPE TESTS SHALL HAVE BEEN CONDUCTED ON ONE UNIT AS PER RELEVANT
STANDARD IS 8623-1977 latest amended:
TN-01/87
1)
Verification of degree of protection IP-55
of encloser (i.e. C&R Panel) in
accordance to IS-13947 Part-1.
B)
TYPE TEST REPORTS IN RESPECT OF APPROVED MAKE OF RELAYS ARE NOT
REQUIRED TO BE FURNISHED FOR AUXILIARY & OTHER RELAYS (EXCEPT
OVER CURRENT & EARTH FAULT RELAY). THE FOLLOWING TYPE TESTS ARE
REQUIRED TO BE FURNISHED IN RESPECT OF NUMERICAL OVER CURRENT &
EARTH FAULT RELAYS:i)
Insulation Test.
ii)
High Frequency Disturbance Test.
iii)
Electrical Fast Transient Test.
iv)
Relay Characteristic, Performance & Accuracy Test.
v)
Steady State Characteristics & operating time Test.
vi)
Test for Thermal requirement.
vii)
Test for Mechanical requirement.
viii)
Test for rated burden.
ix)
Contact performance test.
C)
TYPE TESTS TO BE CONDUCTED ON ONE UNIT OF ANNUNCIATOR:
a) High Voltage Test at 2 KV A.C. r.m.s. for one minute
(IS: 3231/IEC 255-4 Clause 12.3)
b) Impulse
Test 1.2/50 micro sec. 5 KV impulses (IS: 8686/IEC 255-4).
c) Performance/ Functional Test.
d) Temperature Rise Test.
e) Auxiliary Supply variation Test.
f) High Frequency Disturbance Test (IS: 8686).
6.2.3
However, the purchaser reserves the right to demand repetition of some or all
the type tests in presence of purchaser's representative. For this purpose , the
bidder should indicate unit rates for carrying out such type tests.
test charges shall not be taken
6.3
These
into consideration for bid evaluation.
TEST ON BOUGHT OUT ITEMS
Tests are not required to be performed on bought out equipments like Relays,
HT TVMs, switches etc. at the works of manufacturer except operational tests.
Furnishing
Test Certificate of equipments from the original
manufacturers shall be deemed to be satisfactory
tests at Sub-contractors works
equipment
evidence. Inspection
of the
will
be arranged by the supplier whenever
got
conducted
required.
6.4
ROUTINE/ACCEPTANCE TESTS :
The
following
tests
shall be
in
presence of purchaser's
representative.
1)
Checking of wiring of circuits & their continuity.
2)
One minute 2 KV insulation withstand test at 50 cycles on all equipments
on the panels & wiring.
TN-01/88
3)
Insulation resistance of complete wiring circuit
by circuit with
all
equipments mounted on the panel.
4)
Checking the operation, function and calibration
of protection schemes,
instruments & meters
5)
Checking of colour scheme used in wiring as per following requirement :
i)
A.C. three phase circuits
------------------------No.1 Phase
No.2 Phase
No.3 Phase
Colour
-----Red
Yellow
Blue
ii) Neutral conductor
iii) Connections to earth
iv) D.C. Circuits
Black
Green
Grey
6)
Checking of same ferrule numbers at both ends of wires.
7)
Routine tests in accordance with relevant IS or other the international
standards shall be carried out on all the instruments, relays and other
devices or manufacturer's routine test reports shall be enclosed with
inspection report.
6.5
TOLERANCE ON TEST RESULTS :
The tests shall be conducted as per relevant ISS.
6.6
TEST AT SITE :
The
purchaser
reserves the right to
conduct
all tests
on Control & Relay
Panels after arrival at site and the contractor shall guarantee test certificate
figures under actual service conditions.
7.0
INSPECTION :
All the tests (as mentioned at Clause 6.4) and Inspection shall be made at
the
place
bidder
of
manufacturer
unless otherwise especially agreed upon by
and purchaser at the time of purchase. The bidder shall
the
afford the
inspection officer(s) representing the purchaser all reasonable facilities without
charges, to satisfy him that
the material is being furnished in accordance
with this specification. The purchaser has the right to have the tests carried
out at his own cost by an independent agency whenever there is a dispute
regarding
the
quality
of
supply. The Inspection may be carried out by the
purchaser at any stage of manufacture/ before despatch as per relevant
standard. Inspection and acceptance of any material under the specification by
the purchaser, shall not relieve the bidder
material
in accordance
with
of his obligation of furnishing
the specification and shall
not
prevent
subsequent rejection if the material is found to be defective. The Bidder
shall keep the purchaser informed in advance, about manufacturing programme
so that arrangements can be made for inspection.
The
purchaser
reserves the right
routine testings of the
bought
to
insist
for witnessing
out items. The
the acceptance/
Bidder shall give 15 days
advance intimation to enable the purchaser to depute his representative for
witnessing the acceptance and routine tests. The inspection charges would be to
TN-01/89
the purchaser's account (Boarding , lodging and to & fro journies upto the place
of inspection only).
8.0
PACKING AND FORWARDING :
8.1
The
loose equipment shall be
vertical/horizontal
handling during
transport as
transport
packed
the
and
in
crates
suitable
for
case may be and suitable to withstand
outdoor
storage during
transit.
The
Supplier shall be responsible for any damage to the equipment during transit, due
to improper and inadequate packing.
carefully packed
and
marked
The easily damageable material shall be
with
the
appropriate
caution symbol.
Wherever necessary, proper arrangement for lifting, such as lifting hooks etc.,
shall be provided.
Any material found short inside
the packing cases shall
be supplied by Supplier without any extra cost.
8.2
Each consignment shall be accompanied by a detailed packing list containing
the following information :
a)
b)
c)
d)
e)
f)
g)
Name of the consignee.
Details of consignment.
Destination.
Total weight of consignment
Sign showing upper/lower side of the crate.
Handling and unpacking instructions.
Bill of material indicating contents of
each package.
The Supplier shall ensure that the packing and
bill of material are
approved by the Purchaser before dispatch.
9.0
HT TVMs :
9.1
3 phase 4 wire A.C. Static H.T. Trivector
meter of accuracy class 0.5S for
measurement of energy as per latest specification of JVVNL, shall be provided.
Following makes of HT TVMs are acceptable:
i) Secure
ii) L&T
iii) ABB/Elster
iv) Schlumberger
v) Genus Infra
Any other make being procured by Nigam shall also be acceptable.
The technical suitability of relays/schemes may also be examined by Protection
9.2
Wing & acceptability will be judged appropriately.
10.0
MAKE AND TYPE OF BOUGHT OUT ITEMS :
10.1
The following make of bought out items will be acceptable to department :
----------------------------------------------------------S.No. Name of Item
Make
----------------------------------------------------------1.
Indicating Instrument
AE/IMP/MECO
(Analog type)
2.
3.
Indicating Instrument
(Digital type)
Control Switch for Circuit
AE/IMP/MECO
ALSTOM/RECOM/SWITRON/
TN-01/90
4.
5.
Breaker/Trip Transfer.
KAYCEE
Selector Switch for
Voltmeter/Ammeter
SWITRON/KAYCEE/RECOM
Semaphore Indicator
ALSTOM/
DAV IND.(Deepl)/ER
6.
Indicating Lamp
ALSTOM/TEKNIC/
VAISHNO/DAV Ind. (Deepl)
7.
Annunciator
8.
Push Button
9.
A.C. Hooter/Bell
TARGET/INDUSTRIAL
HOOTER/ALAN/JVS
10.
D.C. Hooter
TARGET/INDUSTRIAL
HOOTER/ALAN/JVS
11.
Heater
SOFIA/ELTER/AIREX
KAYCEE
12.
13.
14.
MINILEC/YESHMUN/
INSTALRAM/PROTON/
JVS/PRADEEP/ALAN
TEKNIC/VAISHNO/ESSEN
DAV Ind. (Deepl)
Link Type test terminal
block for testing of TVM
CFL Tube
IMP/CAPITAL/
DAV Ind. (Deepl)
PHILIPS/CROMPTON/BAJAJ
2 Pin/3 Pin socket with
ISI MARK
Switch (5/15A)
Other makes shall also acceptable if it is of "ISI
MARK"
or
type tested for
which tenderers shall furnish attested photostat copies of ISI Certificate/type
test report not older than 5 years for the respective make offered alongwith
tender.
10.2
Make / type of each relay, indicating
control
switches,
instruments, integrating
selector switches,
indicating
lamps,
instruments,
semaphore
indicators, annunciator scheme, bell, hooter etc. shall be clearly and invariably
indicated in the GTP (Guaranteed Technical Particulars), bill of material and
unit price list.
Only specific make accessories shall be indicated.
"EQUIVALENT/REPUTED
11.0
MAKE"
will
not
be
given
The word
for consideration.
GUARANTEE PERIOD OF CONTROL AND RELAY PANELS :
The guarantee period of each control & relay panels along with all accessories
shall be for the period of 5 years from the date of receipt of panel along with
all accessories.
TN-01/91
DETAILS OF EQUIPMENTS SCHEDULE-A
----------------------------1.
33KV CONTROL AND RELAY PANELS FOR CONTROLLING TWO
CIRCUIT
BREAKERS FOR HV SIDE OF 33 KV TRANSFORMER : TYPE-A
Equipment for each circuit shall occupy space on front of panel on either side of
vertical centre as under :
For Transformer 1
----------------One
Section of painted and overlaid mimic
diagram for
one main and one
auxiliary bus arrangement with symbol.
Three
Semaphore indicators for automatic
position indication of Isolators.
One
Semaphore indicator for automatic
One
Three position control switch for the circuit breaker with pistol grip handle.
Four
Indicating lamps for the following :
position indication of circuit breaker.
i) Circuit breaker `ON'
Red.
ii) Circuit breaker `OFF'
Green.
iii) Circuit breaker `Auto-Trip.
iv) Circuit breaker
White.
Amber.
spring charged.
One
Flush
switch board mounting,144 mm square pattern, moving iron AC
Ammeter of Class.1
accuracy, suitable for 5 Amps. CT secondary current
suitably scaled.
One
Ammeter phase selector switch to indicate phase
currents in all the three
phases and off position.
One
3 phase, 4 wire, Static HT-Trivector meters of class 0.5S accuracy.
One
Four Pole IDMTL non directional inverse time combined over current & earth
fault relay with instantaneous attachment with stabilizing resistance.
One
IDMTL
with
One
One
non-directional earth fault relay
with instantaneous
attachment
stabilizing resistance.
High speed trip relay.
Continuous supervision relay for trip circuit healthy check both in closed
and open position of circuit breaker.
One
Test terminal block 3 phase 4 wire.
Five
Auxiliary relay for transformer trouble.
FOR TRANSFORMER 2 :
Equipments for
Transformer
2
shall
be
identical
to
Transformer 1 with
following additions :Three
indicating lamps for the following :
i) VT supply indication (3 nos.) Red, Amber ,Blue
One
Flush
switch-board mounting, 144mm square pattern,
voltmeter
of
class.1 accuracy
moving
suitable for 110V phase to
secondary, suitably scaled.
TN-01/92
iron
AC
phase
VT
One
Voltmeter phase selector switch to indicate phase to phase and phase to
ground voltages of all the three phases.
FOLLOWING EQUIPMENTS
SHALL ALSO BE PROVIDED ON
THE
C/R ANEL IN
COMMON FOR BOTH CIRCUITS.
One
24 way Annunciation windows complete with Annunciator
relays for
indicating 8 trip/non-trip alarms individually.
One
Set
of
3 control Push
buttons
for
`Accept' Reset
and `lamp Test ' of
above annunciation scheme.
One
Bell for Non trip alarm
One
Hooter for trip alarm
One
D.C. under voltage relay.
One
Space heater with switch.
One
230V A.C. flourcent tube with door switch.
One
3 Pin Socket with switch 15Amp. rating.
One
2 Pin Socket with switch 5 Amp. rating.
2.
33KV CONTROL RELAY PANEL FOR CONTROLLING TWO FEEDER CIRCUIT
BREAKERS. TYPE-B
The
C/R Panel shall
accommodate
equipment’s
for
two
feeders. Each
Circuit shall occupy space on front of panel on either side of vertical centre.
EACH OF THE TWO CIRCUITS SHALL HAVE FOLLOWING EQUIPMENTS:
One
Section of painted and overlaid mimic diagram for one main + one auxiliary
Bus arrangement with symbols.
Four
Semaphore
indicators
for
automatic
position indication of isolators and
earth switch.
One
Semaphore indicator for automatic
One
Three position control switch for the circuit breaker with pistol grip handle.
Four
Indicating Lamps for the following :i)
ii)
iii)
iv)
Circuit Breaker `ON'
position indication of circuit breaker.
- Red
Circuit Breaker `OFF' - Green
Circuit Breaker `Auto-trip'-White.
Circuit Breaker
Spring charged -Amber.
One
Flush
switch Board mounting 144mm square
pattern moving iron A.C.
Ammeter of Class-1 accuracy suitable for 5 Amps CT secondary
suitably
scaled.
One
Ammeter phase selector switch to indicate phase
currents in all the three
phases and off position.
One
3
Phase, 4 wire, Static HT Tri-vector meter of class 0.5S accuracy.
One
Four Pole IDMTL non directional inverse time combined over current & earth
fault relay with instantaneous attachment.
One
High speed trip relay.
TN-01/93
One
Continuous supervision relay for trip circuit healthy Check both in closed &
open position of circuit breaker.
One
Test terminal block 3 phase 4 wire.
FOLLOWING EQUIPMENTS SHALL ALSO BE PROVIDED
ON
THE C/R PANEL IN
COMMON FOR BOTH CIRCUITS :
One
8 way Annunciation windows complete with Annunciation
relays for
indicating 8 trip/non trip alarm individually.
One
Set of 3 control push buttons for `Accept' reset and Lamp `Test on
above annunciation scheme.
One
230V A.C. incandescent bulb with door switch.
One
Bell for Non trip alarm
One
Hooter for trip alarm
One
Space heater with switch.
One
3 Pin Socket with switch 15 Amp rating.
One
2 Pin Socket with switch 5 Amp rating.
ANNEXURE-I
33 KV CURRENT TRANSFORMER
FOR HV SIDE OF 33 KV TRANSFORMER
(RATIO : 240-120-60/5-5A)
-------------------------------------------------------NO OF CORE APPLICATION RATED CLASS OF MAXIMUM
MIN.
CORES NO.
BURDEN ACCURACY INSTRUACCUMENT
RACY
SECURITY LIMIT
FACTOR.
FACTOR
-------------------------------------------------------------2
1. BACKUP
PROTECTION
40 VA
5P
-
15
2. METERING
30A
0.5S
5
-------------------------------------------------------------
33 KV CURRENT TRANSFORMER
FOR 33 KV FEEDER
(RATIO : 300-150/5-5A)
-------------------------------------------------------------NO OF CORE APPLICATION RATED CLASS OF MAXIMUM MIN.
CORES NO.
BURDEN ACCURACY INSTRU- ACCUMENT
RACY
SECURITY LIMIT
FACTOR. FACTOR
------------------------------------------------------------2 1. BACKUP
40 VA
5P
15
PROTECTION
2. METERING
30A
0.5S.
5
-------------------------------------------------------------
ANNEXURE-II
TN-01/94
INSTRUMENT RANGES 33 KV
---------------------------------------------------------------------------:33 KV SIDE : 33 KV SIDE :
S. INSTRUMENT :FEEDER PANEL : TRANSFORMER :
NO.
:
: PANEL
:
----------------------------------------------------1 AMMETER
:0-300 A
: 0-240 A
:
:
:
:
2 VOLTMETER
: : 0-40 KV
:
:
:
:
-----------------------------------------------------
ANNEXURE.III
-----------TECHNICAL PARTICULARS OF VOLTAGE TRANSFORMERS
PROPOSED TO BE UTILISED AT VARIOUS SUB-STATIONS.
----------------------------------------------------------:
DETAILS OF VTs.
:
:----------------------------S.NO. PARTICULARS
:
33 KV
:
----------------------------------------------------------1 Type
: Outdoor
:
:
:
:
_
:
2 Rated primary
: 33KV/_/3
:
voltage.
:
:
:
:
3 No. of secondary : Two
:
winding.
:
:
:
:
4 Winding.I
: 110/_/3 V
:
Winding.II
: 110/_/3 V
:
:
:
5 Rated burden :
:
:
:
:
Winding.I
: 100 VA
:
Winding.II
: 100 VA
:
:
:
6 Accuracy class.
:
:
:
:
Winding.I
: 0.5, 3 p
:
Winding.II
:
3p
:
:
:
7 Maximum ratio
:Within limits specified by :
error with rated :IS:3156 for accuracy class :
burden & 5% normal :indicated.
:
primary voltage. :
:
:
:
8 Maximum phase angle :Within limits specified by :
error with rated :IS:3156 for accuracy class :
burden & 5% normal :indicated.
:
primary voltage. :
:
:
:
9 Oil
:Transformer oil conforming :
:to IS:335.
:
:
:
10 Temperature rise of :Within limits specified
:
1.2 times rated
:by IS:3156.
:
TN-01/95
voltage with rated :
:
burden.
:
:
:
:
11 Rated voltage
:1.2 continuous.
:
factor and time. :1.5 for 30 seconds.
:
:
:
12 Temperature for
:Within limits specified
:
11 above.
:by IS:3156.
:
-------------------------------------------------------
TN-01/96
TECHNICAL SPECIFICATION OF MOTORISED RING MAIN UNITS
WITH SCADA COMPATIBILITY
1.0
Scope of work :
Design, Engineering, Manufacturing, assembly,
inspection and testing before
dispatch, packing & forwarding and delivery at site/stores of outdoor type compact
11KV Ring Main Units SF6 with Load break Isolators for 11 KV Incoming & Outgoing
cables and VCB for Distribution Transformer with motorization and necessary take
off terminal units for SCADA automations, other accessories and auxiliaries
equipment’s and mandatory spares, described herein and
required for their
satisfactory operation in various locations of the Jaipur Vidut Vitran Nigam Ltd., in
following tentative quantity and combinations of load break isolators & breakers and
all these units are shielded in a outdoor metal body with a dielectric media of SF6
gas/ solid state epoxy with provision of additional load break switches and circuit
breakers extensible at both side.
Provision of all the necessary take off terminal for “SCADA
READY”
Ring Mains
Units capable of being monitored and controlled by the SCADA/DMS.
Each RMU shall include its own power supply unit (including 230 V AC power supply
from nearest JVVNL mains, batteries and battery charger) which shall provide a
stable power source for the RMU. The RMU’s will be connected to the FRTU will be
procured, supplied and installed as a part of R-APDRP Part-B. The RMU shall include
potential free contacts so as to connect to SCADA/DMS via FRTU, so as to
a.
Monitor and control the open/close status of RMU circuit breaker and load
break switches.
b.
Monitor the local/ remote position of RMU manually-operated switches that
can be used to enable and disable remote monitoring.
c.
Monitor the health of the power supply, which will include the battery failure
and low voltage indication.
1.1
d.
Monitor the open/ closed status of RMU earthing switches.
e.
Monitor the open/ closed status of RMU enclose doors in case of hinge door.
f.
Monitor of low SF6 gas pressure indication
g.
Monitor the circuit breaker relay operation.
h.
Monitor for indication of main-circuit fault detected by the RMU’s FPI.
i.
FPI reset control
j.
Load break switches and circuit breaker open/ close control
The objective of the RMUs is for extremely small construction width, Compact,
maintenance free, independent of climate, easy installation, operational reliability,
Safe and easy to operate, minimum construction cost, minimum site work and
minimum space requirement. The dimensions of a RMU shall preferably be Approx.
1000X1000X1800 mm (WXDXH).
1.2
The RMUs shall conform in all respects to high standards of Engineering design,
workmanship and latest revisions of relevant standards at the time of offer and
TN-01/97
purchaser shall have the right to reject any material which in his judgment is not in
full accordance therewith.
1.3
The type of the 11 KV circuit breaker shall be VCB and insulating medium for load
break isolators, Earth switch, 11 KV Buses and other associated equipment’s should
be SF6 gas / solid state epoxy confirming to relevant IS/IEC.
1.4
Each RMU shall be equipped with all the necessary connectors, terminal blocks and
other accessories that will allow it to be connected to FRTU which will in turn send
required indications and measurement to the SCADA/ DAS via communication
medium.
1.4
The RMU hosing shall have a design such that in the event of an intenal arc fault,
the operator shall be safe. This should be in accordance with IEC 62271-200. The
outdoor RMU must be fully Type Tested for internal arc fault as below.
- For 20KA/1 sec for Main tank hosing the switchgear and breaker
- For 20KA/0.1 sec for the cable compartment.
1.5
As the Ring Main Units will be installed mostly under existing half four pole / two
pole structures, therefore RMUs having FOOT PRINTS that fits exactly underneath
shall be preferred for certain specific requirements.
2.0
STANDARDS :
Unless otherwise specified elsewhere in this Specification, the RMU, Switchboard
(Switchgear), Load break isolators, Instrument Transformers and other associated
accessories
shall conform to the latest revisions and amendments thereof of the
following standards.
IEC
60
298/
12729:1988
IEC
62271-200/IS
General requirement
Switchgear
for
Metal
Enclosed
IEC62271-102/ IS 9921
Alternating current Dis-connector’s
break isolators) and Earthing switch
IEC 62271-100/ IEC 62271-200
Specification for alternating current circuit
breakers.
IEC 62271-1/ IEC 60694
Panel , Vacuum Circuit Breakers
IEC 60044-1/IEC 60185/IS 2705:1992
Current Transformer
IEC 62271-103
High voltage switches
IEC 60273/IS :2099
Dimension of Indoor & Outdoor
insulators with voltage > 1000 Volts
IEC 60529/IS 13947(Part-1)
Degree of protection provided by enclosures
for low voltage switchgear and control gear
IEC 60255
Electrical Relays
IEC 60376
Filling of SF6 Gas in RMUs
The following parts of RMU shall be type tested for Degree of protection:IP 67 - tank with high voltage components.
IP 2X -
front covers of the mechanism.
IP 3X - cable connection covers.
IP 54 - outdoor enclosure/kiosk.
Equipment meeting with the requirements of any other authoritative standards,
which ensures equal or better quality than the standard mentioned above shall also
TN-01/98
(Load
post
be acceptable.
If the equipment’s, offered by the Bidder conform to other
standards, salient points of difference between the standards adopted and the
specific standards shall be clearly brought out in relevant schedule. In case of any
difference between provisions of these standards and provisions of this specification,
the provisions contained in this specification shall prevail. One Hard copy of such
standards with authentic English Translations shall be furnished along with the offer.
3.0.
SERVICE CONDITIONS:
All outdoor Equipment / material to be supplied against this specification shall be
suitable for satisfactory continuous operation under tropical conditions as specified
below:1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Maximum ambient air temperature in shade
500C
Minimum ambient temperature in shade
-2.50C
Maximum Relative humidity
90%
Minimum Relative humidity
10%
Average Annual rainfall
10-100 Cm.
Maximum wind pressure (Kg. Per sq. m.)
45
Height above mean sea level
< 1000 Meter
Dust storms are liable to occur during the period March to July
Average number of rainy days per annum
100
Isoceraunic level (days / year)
40
Moderately hot and humid tropical, climate,
Yes
Conductive to rust and fungus growth
Seismic level (horizontal acceleration)
0.08 g
Due regard should be given to the climatic/service conditions under which the
equipment is to work. Ambient temperature normally vary between -02.5°C and 50
°C, although direct sun temperature may reach 55 °C. The climate is also
moderately humid and rapid variations occurs, relative humidity between 70% and
90% being frequently recorded, but these values generally correspond to the lower
ambient temperatures. The equipment should also be designed to prevent ingress of
vermin, accidental contact with live parts and to minimize the ingress of dust and
dirt. The use of materials which may be liable to attack by termites and other
insects should be avoided.
4.0
TECHNICAL PARAMETERS OF RMU:
I.
II.
11KV Bus Bar
Type of material
: Copper
Current Carrying Capacity
: 630 Amps.
Short time rating current for 3 secs.
: 20 KA
Insulation of bus bar
: SF6/solid state epoxy
Bus bar connections
: Anti-oxide grease
Parameters for Switch Gear of DT and load break isolators
Type
: Metal enclosed
No of Phases
:3
No. of poles
:3
Rated voltage
:12 KV
TN-01/99
Operating voltage
:11 KV(+10% to –
20%)
Rated lightning impulse withstand voltage
:75 KV
Rated power frequency withstand voltage
:28 KV
Insulating medium
:SF6/Solid
State
epoxy.
Rated filling level for insulation
:0.5 bar/As Per IEC.
Max.permissible site altitude at the above gas pressures:≤1000m
(The operating pressure has to be adjusted for greater altitudes)
Rated short time current
:20 KA.
Rated short time
:3s
Rated peak withstand current
:50 KA.
Operating mechanism
:
Circuit
breaker
with
spring assisted anti
reflex mechanism.
Rated current (Bus):
:630 A
Rated current Load Break Isolator:
:630 A
Rated current (breaker)
:200 A
Circuit Breaker interrupter
:Vacuum Interrupter
Rated frequency
: 50 Hz
Rated operating sequence
:O-3min- CO
Number of mechanical/Remote operations for
1000 Nos.
earthing & Ring switches
Number of mechanical/ remote operations
2000 Nos.
for circuit breakers
III.
PRINCIPAL FEATURES:
S.
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DESCRIPTION
Circuit label
Mimic diagram
Supply voltage indication
Current Transformer
Self Powered based Microprocessor based IDMT
Relay (3OC+1EF)
Anti–Reflexing Mechanism
Interlock to defeat the operation of the line side
earthing when the line side isolator is ON.
Interlock to defeat the operation of the earthing
when the breaker is in service position and is ON.
Local /Remote Switch
Breaker ON/OFF indication
Spring Charge indication / Spring assisted
mechanism.
Fault Tripping indication
Bus bar end caps
Whether the SF6 gas pressure gauge indicator and
filling arrangement.
TN-01/100
DT breaker
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
15
16
17
Whether the spring assisted mechanism with
operating handle for ON/OFF.
Whether the earth positions with arrangement for
padlocking in each position and independent
manual operation with mechanically operated
indicator are provided
RMUs are provided with necessary take off
terminals for future SCADA automation.
Yes
Yes
Yes
IV Load break switch(Isolators) :
Type :
SF6/solid state epoxy load breaking and fault making.
Rated current
:
630 A
Fault making capacity (KA peak min.)
:
50 KA
V Earthing switch for 11 KV Line side Isolation and DT :
Rated short time current
:20 KA.
Rated short time
:3s
Rated peak withstand current
:50 KA
Interlocking facility: 1) Between 11 KV Line side isolator ‘ON”& Earthing.
2) Between 11 KV DT side breaker on close condition &
Earthing.
VI Current Transformers for breaker
CT Type
: Tape wound
CT Description
:The CTs of DT breaker shall be suitable
for sensing the minimum primary
variable current in the
order of 1060 A and the secondary current for the
CT is 1 A. The CT
shall be housed in
outside SF6 chamber for testing and
Maintenance.
: Class 10P10 protection
: Suitable for Self Powered Relay.
Accuracy Class
Rated burden
5.
GENERAL CONSTRUCTION FEATURE FOR RING MAIN UNIT:
The compact RMU shall be designed to operate at the rated voltage of 12 KV. It
shall
include, within the same metal enclosure, earthing switches for each Load
Break Switch and Circuit Breaker for earthing each of the devices. Suitable foolproof interlocks shall be provided to these earthing switches to prevent its
inadvertent or accidental closing when the circuit is live and the concerned Load
Break Switch/Circuit Breaker is in closed position. The limiting dimensions shall be
preferably around 1000-mm width x 1000-mm depth x 1800-mm height for the
initial two Load Break Switches and one Circuit Breaker. An additional width of
1000-mm for each addition of the Circuit Breaker is allowed. Provision should be
made for extension of few more Circuit Breakers or Load Break Switches on a future
date. The degree of protection required against environment shall be not less than
IPX4 of IS 12063. The Compact RMU shall have atleast an IP54 Protection Index as
per IS 12063 against dust and splashing of water.
The active parts of the
switchgear shall be maintenance free and the Compact RMU shall be of lowmaintenance type.
5.1
The Ring Main Unit shall be installed at 11 KV junction points to have continuous
supply by isolating faulty sections. The RMU shall be both side extensible and
TN-01/101
consists of the combinations of load break switches and Circuit breakers for a
nominal voltage of 12 KV using SF6 gas/ solid state epoxy as insulating and Vacuum
as arc quenching medium.
5.2
The RMU and combination shall be outdoor metal enclosed type. The RMU metal
parts shall be of high thickness high tensile steel which must be grit/short blasted,
thermally sprayed with Zinc alloy, phosphate and subsequently painted with
polyurethane based powder paint, the overall paint layer thickness shall be not less
than 80 microns.
5.3
Relevant IE rules for clearances, safety and operation inside the enclosure
shall be applicable. The enclosure shall be
free from pollution, humidity, dust,
vermin etc. IP-54 and type tested for accelerated aging & weather proof at
EREDA/CPRI/any other testing house meeting PQR.
5.4
All high voltage live parts except for the cable connections shall be insulated with
SF6 gas/solid state epoxy. The SF6 /solid state epoxy enclosure shall be made of
robotically/laser / TIG/ MIG welded stainless steel/ hermetically sealed metalized
cast resin tank without use of sealant, gaskets, ‘O’ rings, etc. and shall be type
tested for IP-67 Degree of protection.
5.5
The cubicle shall be touch proof metallic encapsulation with a electro galvanized
sheet steel of high thickness and provided with a pressure relief arrangement away
from operator.
5.6
RMU should be suitable for motorization in future for remote operation
through
SCADA.
5.7
Any accidental over pressure inside the sealed chamber shall be limited by the
opening of a pressure-limiting device in the rear/top part of the enclosure. Gas will
be release to the rear of the switchboard away from the operator to ensure safety of
the operating personnel and all the manual operations will be carried out on the
front of the switchboard.
5.8
The enclosure for switchgear and metallic RMU housing shall have a design such
that in the event of an internal arc fault, the operator shall be safe. This should be
in accordance with IEC 298 & Standard IEC 62271-100/200 and relevant TYPE TEST
certificates shall be submitted.
5.9
The Entire units of RMU shall be in a single compact metal clad weather proof
enclosure, outdoor type suitable for all weather conditions. The switchgear and bus
bar shall all be filled with SF6 at 0.5 bar G/IEC/IS Standards relative pressure to
ensure the insulation and breaking functions. The enclosure must be sealed for life
and shall meet the “sealed pressure system” criterion in accordance with the IEC
298 & 62271-100/200 standard .The RMU must be a system for which no handling
of gas is required throughout the 30 years of service life.
5.10 Suitable temperature rise test on the RMU with enclosure shall be carried out as per
relevant IEC/IS.
5.11
Each switchboard shall be identified by an appropriately sized label, which clearly
indicates the functional units and their electrical characteristics.
TN-01/102
5.12
The switchgear and switchboard shall be designed so that the position of the
different devices is visible to the operator on the front of the switchboard and
operations are visible as well.
5.13
The entire system shall be totally encapsulated. There shall be no access to exposed
conductors. In accordance with the standards in effect, the switchboards shall be
designed so as to prevent access to all live parts during operation without the use of
tools.
5.14
The entire 11 KV RMU
shall be insulated by inert gas (SF6) / solid state epoxy
suitable for operating voltage up to 12 KV respectively. The 12 KV circuit breakers
must be VCB. It is necessary to fit an absorption material in the tank to absorb the
moisture from the SF6 gas to regenerate the SF6 gas following arc interruption. The
SF6
insulating
compensating
medium
gas
shall
pressure
be
constantly
indicator
offering
monitored
a
via
simple
a
temperature
indication.
All
the
combination of the RMUs should have the required SF6 insulation by providing
necessary gas chamber capacity. The provision to indicate pressure of SF6 Gas on
RMU Panel shall be provided.
5.15
The tank shall be made of suitable stainless steel/ cast resin tank of adequate
thickness and shall be able to withstand any accidental internal over pressure of at
least 3 bars.
5.16
The Compact RMU shall be suitable for mounting on its connecting cable trench. A
suitably sized nameplate clearly indicating its functional units and their electrical
characteristics shall identify each unit. The positions of the different devices shall be
clearly visible to the operator on the front of the compact RMU and the operations
shall be clearly visible. The compact RMUs shall be such that access to live parts
shall not be possible without the use of tools.
5.17
The design shall incorporate such features to prevent any accidental opening of the
earth switch when it is in closed position. Similarly accidental closing of Circuit
Breaker or Load Break Switch shall be prevented when the same is in open position
from the release of any latch or spring in tension due to vibrations caused externally
or internally and shall prevent accidents.
5.18
Each RMU shall be provided 230 V AC supply from the nearest JVVNL mains which
shall provide a stable power source to RMU and battery charger.
5.19
The compact RMU shall be of single busbar outdoor, tropicalized in accordance with
the relevant clauses mentioned in these specifications. An earth fault passage
indicator using a core balance Current Transformer shall be provided for the
Incomers to assist in identifying the faulty cable section in order to isolate the same.
5.20
•
The Incomers panel shall comprise of, but not limited to the following:
A triple pole Solid State epoxy /SF6 Load Break Switch rated 630 Amps or higher,
with a rated making capacity under fault conditions with short circuit levels of 20 KA
or above at 11 KV
•
Core balance Current Transformer and earth fault passage indicators (The indicator
flag of the relay shall be visible till such time the relay is reset manually)
TN-01/103
•
These shall not require any external Power Supply and must be suitable for
unattended places.
5.21
The transformer loop circuit control panels shall consist of but not limited to the
following:
• A triple pole Vacuum Circuit Breaker rated 200 Amps or higher, with a rated making
capacity under fault conditions with short circuit levels of 20 KA or above at 11 KV
• Manually charged spring closing mechanism
• Electronic relay with associated Transformers of accuracy clause 10P10 and tripping
mechanism. CT burden shall be as per requirement of self powered Relay.
• Mechanical "ON", "OFF" indicator
• Manual tripping device
• Mechanical "Spring Charged", "Spring Free" indicator in case of stored energy
devices.
• Provision for retrofitting meters and SCADA System
6.
Sulphur Hexafluoride Gas (SF6 GAS) :
The SF6 gas shall comply with relevant standard IEC-376, 376A & 376B and shall be
suitable in all respects for use in 12 KV panels under the operating conditions. The
SF6 shall be tested for purity, dew point air hydrolysable fluorides and water
content as per IEC-376, 376A & 376B and test certificate shall be furnished to the
purchaser indicating all the tests as per IEC-376 for each Lot of SF6 Gas. The
metallic enclosure should be tested for leakage at site.
7.
RMU OUTDOOR METAL CLAD:The RMU enclosure must be a metallic; it follows an industrialized process of
manufacturing. The RMU shall be of single bus bar SF6 gas/solid state epoxy
insulated outdoor, tropicalised and metal enclosed type. The RMU metal parts shall
be made of high thickness high tensile steel which must be grit/short blasted,
thermally sprayed with Zinc alloy, phosphate and subsequently painted with
polyurethane based powder paint, the overall paint layer thickness shall be not less
than 80 microns. The rating of enclosure shall be suitable for operation on three
phase, three wire, 12 KV, 50 cycles, A.C. System with short-time current rating of
20KAfor 3 seconds with Panels.
TAKE OFF TERMINAL UNITS FOR FUTURE AUTOMATION :
The RMU should be provided with necessary take off terminal units for future
SCADA
automations. Both the load break switches and the tee off circuit breaker
shall be suitable for motorization in future.
8.
ISOLATORS (LOAD BREAK TYPE) :
The load break isolators for Incoming and Outgoing supply must be provided and
the load break isolators are fully insulated by SF6 gas/Solid State Epoxy. The load
break isolators shall consist of 630 Amp fault making/load breaking spring assisted
ring switches, each with integral fault making earth switches. The switch shall be
naturally interlocked to prevent the main and earth switch being switched ‘ON’ at
the same time. The selection of the main and earth switch is made by a lever on the
TN-01/104
fascia, which is allowed to move only if the main or earth switch is in the off
position. The load break isolators should have the facility for future remote
operation. Each load break switch shall be of the triple pole, simultaneously
operated, non automatic type with quick break contacts and with integral earthing
arrangement.
The
earthing switch shall also be designed for rated fault making of 50KA for
operator’s safety reasons.
9.
SCADA CONNECTIVITY:
Provision shall be made in all the RMUs with necessary take off terminal units for
future automations / SCADA connectivity.
10.
VACUUM CIRCUIT BREAKER :
The VCB for the controlling of Distribution Transformer must be provided inside the
outdoor metal clad and insulated by SF6 gas/Solid State epoxy. The VCB circuit
breaker must be a spring assisted three positions with integral fault making earth
switch. The selection of the main/earth switch lever on the fascia, which is allowed
to move only if the main or earth switches is in the off position. The manual
operation of the circuit breaker shall not have an effect on the trip spring. This
should only be discharged under a fault (electrical) trip; the following manual reset
operation should recharge the trip spring and reset the circuit breaker mechanism in
the main off position.
The circuit breaker shall be fitted with a mechanical flag, which shall operate in the
event of a fault (electrical) trip occurring. The ‘tripped’ flag should be an
unambiguous colour differing from any other flag or mimic.
Both the circuit breaker and ring switches are operated by the same unidirectional
handle.
The protection on the circuit breaker shall comprise of the following components:
Protection Relay
•
The RMU shall be equipped with self-powered numerical relays, to trip the RMU
circuit breakers.
General
•
The Circuit Breaker in the RMU shall be fitted with a communicable-type, selfpowered numerical relay, i.e., one for each outgoing circuit breaker. The
protection relay ’s auxiliary contracts shall be hardwired to the RTU. The relay
shall also interface with the RTU via an Rs. 232/485 port in order to send, as a
minimum, real-time readings using the open protocol.
•
The numerical relay shall be self- powered and should provide Inverse Definite
Minimum Time (IDMT) and Instantaneous protection characteristics. ON this
basis, the relay as a minimum shall provide.
•
Phase Over current Protection (50/51)
•
Earth Fault Protection (50N/51N)
TN-01/105
•
The relay shall be provided with an input for remote tripping. Which shall be
realized via an electric output pulse even without presence of phase current. A
flag indicator shall be installed for signaling the occurrence of trip conditions.
Features and Characteristics
•
The numerical relay shall have the following minimal features and characteristics
noting that variations may be acceptable as long as they provide similar or
better functionality and/or fallibility.
•
It shall be housed in a flush mounting case and powered by the RMU power
supply unit.
•
It shall have three phase over current elements and one earth fault element.
•
IDMT trip current settings shall be 50-200% in steps of 1%
for phase over
current and 10-80% in steps of 1% for earth fault.
•
Instantaneous trip current settings shall be 100-3000% in steps of 100% for
phase over current and 100-200% in steps of 100% for earth fault.
•
Selectable IDMT curves shall be provided to include, for example, Normal
Inverse, Very Inverse, Extreme Inverse, Long Time Inverse, and Definite Time.
Separate curve settings for phase over current and earth fault shall be
supported.
•
For IDMT delay multiplication, the Time Multiplies setting (TMS) shall be
adjustable from 01 to 0.1 in 0.1 steps.
•
The relay shall also be provided with :
-
Alphanumeric Liquid Crystal Display (LCD) for relay setting.
-
Communications via a MODBUS RS 232/RS485 port to provide the RTU
(and hence the DAS) with phase current measurements. It is also
desirable that this same means of communication can be used by the
RTU to send setting and control commands to the relay.
-
Parameter change capability that is password protected.
The protection system should be suitable for protecting transformers of rated power
from100 KVA to 1000 KVA . The relay should be housed within a pilot cable box
accessible. A facility of provision for the delay of transformer in-rush current shall be
provided on relay to avoid nuisance tripping. Outlived/ defective batteries wherever
provided shall be replaced promptly during the Guarantee period of RMU.
11.
BUSHINGS :
The units are fitted with the standardized bushings that comply with IEC standards.
All the bushings are the same height from the base and are protected by a cable
cover. All the
welded with
12.
bushings
the SS
shall
be
Partial
Discharge
free
&
preferably
Laser
container in case of stain less steel tank type RMU.
CABLE BOXES :
All the cable boxes shall be air insulated suitable for dry type cable terminations.
The cable boxes at each of the two ring switches shall be suitable for accepting HV
cables of sizes 3c x 300 / 3c x 185 sq.mm and circuit breaker cable be suitable up
to 3c x 70 sq.mm.
TN-01/106
•
Necessary Right angle Boot should be supplied to the cable terminations. The
type of the Right angle Boot should be cold applied insulating Boot.
•
A non Ferro- magnetic cable clamp arrangement for 3 core XLPE cables must be
provided for all cables terminated on the RMU. Glands in the base plate of the
RMU shall be provided for proper Cable termination.
13.
FAULT PASSAGE INDICATORS (FPI):
This shall be integral part of the RMU and shall be provided to assist in identifying
the faulty cable section in order to isolate the same. The Fault Passage Indicators
(FPI) shall have automatic rest facility and shall be suitable for trouble free
operation. The indicator flag of the relay shall be visible till such time the relay is
reset. LED indicating bulb should be provided for better visibility particularly in day
time.
The FPI shall be mounted on the each of the Load Break Switch unit enclose along
with its integral CT for phase and earth fault monitoring. The FPI shall either be self
-powered type requiring no auxiliary power or build-in batteries.
The FPIs shall include :
Fault detection – phase to phase and phase to earth faults
Potential free output contacts for hard wiring to FRTUs. On this basis, the
SCDA/DMS will be able to monitor phase/ earth fault condition.
Local fault indications – LED display on FPI front panel along with LED indication on
front panel of RMU enclose.
FPI shall be self-rest type upon fault indication.
The characteristic of the FPIs shall include :
Phase fault threshold configurable from at least 250 to 625 Amp.
Earth fault threshold configurable from at least 40 to 100 Amp.
Number of steps for adjusting phase and earth fault threshold at least four.
Fault current duration range configurable from at least 40ms to 500 ms in 20 ms
steps.
Variation with respect to these characteristic may be acceptable as along as they
prove applicable and provide the same or better flexibility.
14.
CABLE TESTING FACILITY :
It shall be possible to test the cable without opening
the cable boxes or ‘where
there is no provision for testing the cable without opening the door or cover’,
opening of door or cover should not be possible unless the earthing switch is closed
as per IEC 298 clause 5.102.4. The cable testing should be possible without
dismounting the cable plugs but the after opening the cable covers.
15.
VOLTAGE INDICATOR LAMPS AND PHASE COMPARATORS :
The RMU shall be equipped with a voltage indication to indicate whether or not there
is voltage on the cable. There should be a facility to check the synchronization of
phases with the use of external device. It shall be possible for the each of the
function of the RMU to be equipped with a permanent voltage indication as per IEC
601958 to indicate whether or not there is voltage on the cables. The indicating
lamp shall be LED type for better visibility during day light.
TN-01/107
16.
EXPANDABILITY :
Each combination of RMU shall have the provision for future extension on both sides
by load break isolators / Circuit breakers, with a suitable trunking chamber and
accessories and necessary Bus Bar. Extensible isolator(s) and circuit breaker(s) shall
be individually housed in a separate SF6 gas/Solid State epoxy enclosures. Even in
case of extensible circuit breakers, the Breaker should be capable of necessary
short circuit operations as per IEC at 20 KA, and the Breaker should have a rated
current carrying capacity of 200 A.
17.
BUS COUPLER/ BUS BAR SECTIONALISER WITH LOAD BREAK SWITCH
The load break switch of the Bus bar Sectionaliser shall be rated for 12 KV, 630A,
20KA for 3 secs. The LBS should be housed in a SF6/solid state epoxy Insulated
stainless steel / cast resin enclosure conforming to IP-67 Degrees of protection and
shall be with motorized mechanism. The sectionaliser shall be provided with all the
necessary electrical and mechanical interlocks required for proper functioning with
the Incomers.
18.
Surge Voltage suppression :
The RMU shall be designed to operate on input power containing voltage spikes. The
equipment shall be protected against part failure or malfunctioning such as
intermittent firing of triggering devices due to surge voltage spikes occurring
randomly over the instantaneous supply voltage.
The RMU shall be equipped with a surge suppressor device connected to the 3 –
phase of the 11 KV bus of the RMU. The surge suppressor device shall confirm to
the relevant IS standard or IEC standard.
19.
PADLOCKING FACILITIES
Provision shall be made for padlocking the load break switches/ Circuit breaker, and
the earthing switches in either open or closed position with lock & master key. The
circuit breakers and earthing switches can be locked in the open or closed position
by 1 to 3 padlocks 6 to 8 mm in diameter.
20.
WIRING & TERMINALS:
The wiring should be of high standard and should be able to withstand the tropical
weather conditions. The wiring cable must be standard single-core non-sheathed,
Core marking (ferrules), stripped with non-notching tools and fitted with end
sleeves, marked in accordance with the circuit diagram with printed adhesive
marking strips. All wiring shall be provided with single core multi-strand copper
conductor wires with P.V.C insulation and shall be flame retardant low smoke type.
The wiring shall be carried out using multi-strand copper conductor super flexible
PVC insulated wires of 650/1100V Grade for AC Power, DC Control and CT circuits.
Suitable colored wires shall be used for phase identification and interlocking type
ferrules shall be provided at both ends of the wires for wire identification. Terminal
should be suitably protected to eliminate sulphating.
Connections and terminal
should be able to withstand vibrations. The terminal blocks should be stud type for
TN-01/108
controls and disconnecting link type terminals for CT leads with suitable spring
washer and lock nuts.
Flexible wires should be used for wiring of devices on moving parts such as swinging
Panels (Switch Gear) or panel doors. Panel wiring shall be securely supported,
neatly arranged readily accessible and connected to equipment terminals, terminal
blocks and wiring gutters. The cables should be uniformly bunched and tied by
means of PVC belts and carried in a PVC carrying trough.
The position of PVC carrying trough and wires should not give any hindrance for
fixing or removing relay casing, switches etc., Wire termination shall be made with
solder less crimping type of tinned copper lugs. Core identification plastic ferrules
marked to correspond with panel wiring diagram shall be fitted with both ends of
each wire. Ferrules shall fit tightly on the wire when disconnected. The wire number
shown on the wiring shall be in accordance with the IS.375.
All wires directly connected to trip circuits of breaker or devices shall be
distinguished by addition of a red color unlettered ferrule.
Inter-connections to adjacent Panels (Switch Gear) shall be brought out to a
separate set of Terminal blocks located near the slots or holes to be provided at the
top portion of the panel.
Arrangements shall be made for easy connections to
adjacent Panels (Switch Gear) at site and wires for this purpose shall be provided
and bunched inside the panel. The bus wire shall run at the top of the panel.
Terminal block with isolating links should be provided for bus wire. At least 10% of
total terminals shall be provided as spare for further connections. Wiring shall be
done for all the contacts available in the relay and other equipment and brought out
to the terminal blocks for spare contacts. Colour code for wiring is preferable in the
following colours.
Voltage supply
: Red, Yellow, Blue for phase and Black for
Neutral
CT circuits
: Similar to the above
DC circuits
: Grey for both positive and negative
•
250V AC circuits
Earthing
:
:
Black for both phase and neutral
Green
The wiring shall be in accordance to the wiring diagram for proper functioning of the
connected equipment. Terminal blocks shall not be less than 650V grade and shall
be piece-molded type with insulation barriers.
The terminal shall hold the wires in the tight position by bolts and nuts with lock
washers. The terminal blocks shall be arranged in vertical
formation at an inclined
angle with sufficient space between terminal blocks for easy wiring.
The terminals are to be marked with the terminal number in accordance with the
circuit diagram and terminal diagram. The terminals should not have any function
designation and are of the tension spring and plug-in type.
21.
EARTHING :
TN-01/109
EARTHING
OF
ISOLATORS
AND
DISTRIBUTION
TRANSFORMER
BREAKERS (EARTH SWITCH) :
Necessary arrangements shall be made at Load break isolators / Distribution
Transformer Breaker for selecting Earth position. Mechanical interlocking systems
shall prevent the RMU function from being operated from the ‘ON’ to ‘Earth On’
position without going through the ‘OFF’ position.
The RMU outdoor metal clad, Switch Gear, Load break isolators, Distribution
Transformer ,LT pillar box, & steel structure etc., shall be equipped with an earth
bus securely fixed along the base of the RMU.
When several units of the RMU (Extra Isolators / Breakers) are mounted adjoining
to each other, the earth bus shall be made continuous and necessary connectors
and clamps for this purpose shall be included in the scope of supply. The size of the
earth bus shall be made of IEC / IS standards with tinned copper flat for RMU
earthing. Provision shall be made on end of RMU for connecting the earth bus to the
earth grid.
All metal parts of the switchgear which do not belong to main circuit and which can
collect electric charges causing dangerous effect shall be connected to the earthing
conductor made of copper having Cross Sectional area of minimum 75 mm″. Each
end of conductor shall be terminated by M12/equivalent quality and type of terminal
for connection to earth system installation. Earth conductor location shall not
obstruct access to cable terminations.
The following items are to be connected to the main earth conductor by rigid or
copper conductors having a minimum cross section of 75 mm″ (a) earthing switches
(b) Cable sheath or screen (c) capacitors used in voltage control devices, if any.
All metallic cases of the relays, instruments and other panel mounted Equipment’s
shall be connected to the earth bus by independent copper wires of size shall be made
of IEC/IS standards. The colour code of earthing wire shall be green. Earthing wires
shall be connected on the terminals with suitable clamp connectors only and soldering
shall not be permitted.
22. ACCESSORIES & SPARES:
The following spares and accessories shall be supplied along with the main
equipments at free of cost:1.
Charging lever for operating load break isolators & circuit breaker of each
RMU
2.
Kit for identifying SF6 gas leakage – 5 numbers
3.
All pressure gauges indications – 5 numbers
4.
Necessary SF6 gas filling plant with adopter and tools etc for filling SF6 gas
at Site --2 Nos
5.
Necessary gas cylinders with adopter
,pressure gauge for storage
of SF6
gas –2 Nos
6.
Any other spares & Tools, which are all essentially required at the time of
emergency and routine maintenance.
TN-01/110
The following accessories shall be supplied with each compact RMU at free of cost:
1.
2.
Pad locks for all doors with one set (3 Nos.) Master keys
Earth bus formed out of 30X5 mm tinned Copper flat.
3. Wire guard protective mesh on the front doors and back for prevention of
pasting of papers etc.
4. Base channel with foundation bolts
5. Live part shrouds, danger plates, caution boards, name plates, rating plates
etc. as per requirements
6. All other components, even though not specifically mentioned, but required
for the safe operation of the unit.
23.
TESTING OF EQUIPMENT & ACCESSORIES:
23.1
INSPECTION & TESTIMG :
The inspection may be carried out by the JVVNL at any stage of manufacture. The
supplier shall grant free access to DISCOM’s representative at any reasonable time
when the work is in progress. Inspection and acceptance of any equipment under
this specification by the DISCOM shall not relieve the supplier of his obligation of
furnishing equipment in accordance with the specification and shall not prevent
subsequent rejection if the equipment is found to be defective.
The supplier shall keep the DISCOM informed in advance, about the manufacturing
programme so that arrangement can be made for inspection. The JVVNL reserves
the right to insist for witnessing the acceptance/routine testing of the bought out
items. The JVVNL has rights to inspect the supplier’s premises for each and every
consignment for type & routine test.
No material shall be dispatched from its point of manufacture unless the material
has been satisfactorily inspected and tested / unless the same is waived by the
JVVNL in writing.
23.2
ACCEPTANCE AND ROUTINE TESTS :
All acceptance and routine tests as stipulated in the latest relevant IS/IEC shall be
carried out by the supplier at his works in the presence of Nigam’s representative.
The supplier shall give at least 15 days advance intimation to the DISCOM to enable
them to depute their representative for witnessing the tests. The cost towards these
tests and other expenses shall be borne by the supplier.
23.3
ADDITIONAL TESTS :
The DISCOM reserves the right for carrying out any other tests of a reasonable
nature at the works of the supplier/laboratory or at any other recognized
laboratory/research institute in addition to the above mentioned type tests,
acceptance and routine tests at the cost of the DISCOM to satisfy that the material
complies with the intent of this specification.
23.4
TYPE TEST
The successful bidder should, submit copies of all Type test certificate of their make
in full shape as confirming to relevant ISS/IEC of latest issue obtained from a
TN-01/111
laboratory/ testing house as detailed in Pre Qualifying Requirement (PQR) attached
with.
The above type test certificates should accompany the drawings for the materials
duly signed and certified by the institution who has issued the type test certificate.
The following type test certificate shall be provided:
S. No.
01.
02.
Short time current withstand test and peak current withstand test.
Lightning Impulse voltage with-stand test
03.
Temperature rise test
04
Short Circuit current making and breaking tests
CB
Isolator
Power frequency voltage withstand test (dry/wet)
Capacitive current switching test confirming to IEC
Mechanical Endurance Test confirming to IEC /
Measurement of the resistance of the main circuit.
Checking of degree of protection
Switch, circuit breaker, earthing switch making Capacity
CB
Earth Switch
Switch, circuit breaker, earthing switch breaking Capacity
CB
Internal Arc Withstand
Partial Discharge test on Complete RMU
Other type & routine tests insists by IEC for RMU
05.
06
07.
08
09
10
11
12
13
14
23.5
Name of Type Test
PRE-COMMISSIONING TESTS :
All the pre-commissioning tests shall be carried out by Nigam representative in the
presence of the supplier’s representative (if wish to present), for which 7 day
advance intimation will be issued by field officer to the firm.
24.0
PERFORMANCE GUARANTEE
23.1
The performance Guarantee period shall be 5 (Five) years from the date of receipt
of equipment along with its all accessories.
23.4
These guarantees shall supplement the general provisions covered under General
Conditions of Contract in clause entitled “Guarantee”.
23.5
Liquidated damages for not meeting specified performance shall be assessed and
recovered from the supplier. Such liquidated damages shall be without any
limitation whatsoever and shall be in addition to damages, if any payable under any
other clause of General Conditions of Contract.
25.0
NAME PLATE:
Each RMU and its associated equipments shall be provided with a nameplate legible
and indelibly marked with at least the following information.
(a)
(b)
(c)
(d)
Name of manufacturer
Type, design and serial number
Rated voltage and current
Rated frequency
TN-01/112
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
Rated symmetrical breaking capacity
Rated making capacity
Rated short time current and its duration
Purchase Order number and date
Month and Year of supply & Expiry of Guarantee period
Rated lighting impulse withstand voltage
D.C. component of current.
Feeder name(Incoming and Out going),DTs Structure name,11000Volts
Dangers etc.
NOTE:i) The word rated need not appear on the name plate. Recognized
abbreviations may be used to express the above particulars.
ii)Whether
the
circuit
breaker
is
fitted
with
closing/tripping
devices
necessitating an auxiliary supply shall be stated either on the circuit breaker
name plate or any other acceptable position.
B)
TECHNICAL SPECIFICATION OF RING MAIN UNITS FULLY MOTORIZED AND
SCADA COMPATIBILE
Nigam is also intend to purchase RMU fully motorized with SCADA compatibilty for
which additional features shall be incorporated in addition to metioned in the above
specification of RMU having provision for future motorization & SCADA compatibility
to fullfill the following requirement :-
i)
Both LBS & T-off VCB shall be compatible for remote operation through SCADA.
ii)
Fault Passage Indicator (Non-communicable) shall be provided with potential free
contacts for SCADA compatibilty & should have provision for remote reset.
iii)
Protection & auxialry relay should have self resetting feature as well as remote
resetting feature.
iv)
status (Potential free contacts) signal to SCADA – to be wired to marshalling
terminal block:
v)
• LBS close/open
• LBS & CB Earth switch close/open
• Battery Charger Fail
• CB close/open
• Protection relay operated
• FPI operated
• SF6 gas pressure low
• Trip Coil healthy
• Local remote
• Spring charge
• RMU door open
• Power supply healthy
Commands from
SCADA – to be wired to marshalling terminal block: LBS
clsoe/open, CB close/open, FPI Reset etc.
The following are the specific requirement for SCADA connectivity & motorization:
•
Each RMU shall be fitted with a power supply, including batteries and battery
charger, suitable for operating the motors of the on-load Isolators and Circuit
Breakers. On this basis, the following operational specifications shall apply.
•
The Power supply unit shall conform to the following requirements :-
Input : 230 V AC from the nearest JVVNL mains
-
Output : Stable 24/48 V DC.
TN-01/113
•
The Power supply
The batteries shall have sufficient capacity to supply power to the following
devices with a nominal backup of 4 hours
•
-
RMU’s motors for a minimum of five (5) operations.
-
RMU’s trip coils, close coils, FPI (in case required).
The batteries shall be of sealed lead acid VRLA or dry type and shall have a
minimum life of vie (5) years at 25 C.
•
The battery charger shall be fully temperature compensated.
•
The prevent deep discharge of the batteries on loss of AC power source, the
battery charger shall automatically disconnect all circuitry fed by the batteries
following a user-adjustable time period or when the battery voltage falls below a
preset value. If the battery voltage falls below the preset value, the time to fully
recharge all batteries shall not exceed twenty-four (24) hours.
•
An automatic battery checking device shall be provided to check the battery’s
health and initiate a battery-failed alarm signal in case battery deterioration is
detected. Such detection may be based on comparing measurement values with
set values with set values (e.g., internal resistance, voltage, etc.)
•
The battery charger shall be provided with an alarm displayed at the local
control panel and remotely at the DAS to account for any of the following
conditions.
-
Low battery voltage
-
High battery voltage
-
Battery failed
-
Battery charger over voltage
-
Grounded battery/battery-charger
-
Others according to manufacture’s design
Motor :
•
The RMU shall be fitted with spring charging motors of high insulation class
allowing the circuit breakers and load break switches to be operated without
manual intervention.
•
In addition to allowing circuit breaker tripping by the RMU’s protection relays,
the moterized operating mechanism shall be suitable for remote control by
the SCADA.
•
The motors along with the supplied control card and push buttons shall allow
Utility’s personnel to electrically operate the circuit breakers and load break
switches at site without any modification of the operating mechanism and
without de-energizing the RMU.
TN-01/114
SPECIFICATION FOR 33KV OUTDOOR LOAD BREAK SWITCH WITH
REMOTE COMMUNICATION CAPABILITIES
1. Scope:This specification covers requirement for outdoor pole mounted Load break switch
(LBS) with capability of being integrated with any SCADA system using FRTUs. The
load break switch shall be designed for pole mounted or substation installation. All of
the unit’s protection, control and metering functions shall be electronically controlled
within an integrated, modularized control unit. The load break should be capable of
effectively extinguishing the arc by injecting the air through the pressurized chamber.
Use of SF6 gas for either insulation or arc extinguishing is not permissible due to its
harmful greenhouse effects.
2. General:The LBS shall be suitable for use on non-effectively earthed and effectively earthed
networks and under the system conditions and service conditions as follows:
1
Rated Voltage
kV
33
2
Highest System Voltage
kV
36
3
Rated Normal Current
A
800
4
No. of Poles
3
Air Break Load Break
5
Switch Type
Switch
Vertical/Horizontal
6
Operating Condition
Break, Outdoor Type
7
Applicable Standard
IEC 62271-103
-10 degrees C to +55
8
Temperature
1
9
degrees C
min
power
frequency
(Across / Phase-Earth)
Lightning
Impulse
withstand
kV
80 / 70
voltage
10
(1.2/50 us) (Across / Phase-Earth)
kV
195 / 170
11
Rated Frequency
Hz
50
12
Rated Short-time withstand current
kA, s
16 for 3 seconds
kA
13
Short Circuit Making Current (TDma)
peak
14
Breaking/Interrupting Medium
Air (Solid State)
15
Isolating Medium
Air
16
Insulator Type
Polymer
17
Creepage Distance (Minimum)
mm
40
900
Motorized
18
Operating Mechanism
19
Mounting
of
Motor
and
Manual
/
Motor
Operating
TN-01/115
On the Pole with the
Mechanism
3.
switch
20
Closing Time
ms
< 1000
21
Opening Time
ms
< 1000
22
Suitable for future SCADA
Yes
23
Padlocking facilities
Yes
Construction:The R,Y,B three-phase of the load break switch is installed on one great sectional
galvanized square steel base, joint together with one integrative drive axis interphase to ensure for closing and opening three poles synchronously.
The arching chamber should be maintenance-free, which should operate at the time
of closing and opening. Being the heart of the load break switch, it should be
capable of extinguishing the arc formed when operated on full load. There shall not
be any requirement of external energy for holding the position CLOSE or OPEN. The
use of HV/LV solenoids is not acceptable.
Oil / SF6 is not acceptable for interruption or insulation purposes. The unit shall be
designed for M1 class for mechanical endurance.
Provisions shall be included for electrical close, and electrical and manual trip. Each
pole of the LBS shall be identical to allow complete replacement of any individual
pole, without disassembly or replacement of the other poles. All parts must be field
replaceable. The LBS shall be suitable for mounting on channel on D.P. Structure.
There should be no connecting rods / operating rods / down pipe which connects the
switch mechanism to the control box located below. The motor and gears should be
fitted with the switch on the pole with only wires coming down for connection with
the control box.
Depending on the design, each phase should have 2/3 insulators for fixed contacts
and pads and for operation of the moving contact.
The fixed contact, moving contact and terminal pads must be made of hard drawn
electrolytic copper. The current density for fixed contact, moving contact and
terminal pads must be minimum 2.0A/sqmm.
4.
Mechanism:The load break switch should compose of a disconnect blade, an arc extinguishing
chamber in air and an operating mechanism. The arc extinguishing chamber should
be made of insulating material with the merits of high electric performance, arcendurance and high strength. The chamber should have a built-in spring with fast
acting mechanism which ensures breaking of load current, hence being free from
operating speed of the user. The arching gap and disconnect gap of the load break
switch should be parallel in the course of opening and closing.
This load break switch should be operate-able by a manual linking rod or motor
operating mechanism. There should be a visible gap of switch after opening to
produce functions of isolation and protection. The blade of the switch should use
press spring to assure enough connection pressure to the contact. By use of the
TN-01/116
spring the operation should be made convenient, the blade stable and the reliability
of opening-closing operation should be guaranteed. The switch should open or close
under rated load current and not require any secondary protection device.
The load break switch should work on the principle of extinguishing the arc by a
blast of compressed air produced by the switch itself while opening the main moving
contact tube.
5.
Solid Dielectric Insulation:The phase to phase shall be adequate for meeting the dielectric requirements. The
creepage distance of insulators shall be minimum 900 mm to ensure the safety even
in worst case failures of the quenching device. Use of boots or screw on bushings to
meet Creepage is not acceptable.
The switch will go through high vibrations due to fast operations and the high
creepage will give added safety.
The distance between pole to pole when the switch is open should take into
consideration of the case when the chamber does not operate.
6.
Adding SCADA compatibility:The load break switch should be capable of being integrated with SCADA functions
using an FRTU (Feeder Remote Terminal Unit). The load break switch should be
capable of reporting switch ON/OFF status and should be capable of being operated
(OPEN/CLOSE) by GPRS function.
7.
Control equipment
7.1
Control cabinet:-
The control cabinet of the LBS should be capable of locally and remotely operating
the LBS. It should be capable of sending the status of ON/OFF to the control room
at the substation through a wire.
The control cabinet should take an input of 220VAC/110VDC, which will be specified
in the tender document, which is used to operate the motor and send a logical 1 or
0 to the control room indicating ON/OFF respectively.
The control for the LBS shall be capable to be integrated with a high end SCADA
compatible numerical relay which has inbuilt UPS and power control electronics
cabinets that houses equipment for protection and control and shall be mounted
independently of the LBS.
The cabinet of the LBS should be capable of shall be adequately sealed and dust
protected and shall be internally treated to prevent moisture condensation. The
degree of protection shall be suitable for Outdoor installation. The cabinet must be
made of stainless steel. Mild Steel or Aluminium will not be acceptable.
The door of the cabinet shall be fitted with a robust fastening arrangement that is
capable of being secured by a padlock.
The control must have Open and Close pushbuttons.
8.
REQUIREMENTS
8.1
General
The load break switch shall be suitable for use on non-effectively earthed and
TN-01/117
effectively
earthed
networks
and under the system conditions
and service
conditions as follows:
S. No. Item
Data
1
Operating Mechanism
LV Motor
2
Altitude
Up to 3000 m;
3
Ambient Temperature
Minimum- -10°C;
Maximum- 55°C;
4
Maximum Daily Variation
35°C;
5
Pollution level
Medium/heavy
(Special Applications);
6
8.2
Lightning Activity
High.
Mounting
8.2.1 The LBS shall be suitable for single pole/DP mounting.
8.2.2 The LBS shall be fitted with an external M12 earthing stud, complete with a nut,
lock nut and spring washer. The earth stud shall be welded to the tank for optimal
earthing connection.
8.2.3 The mass of the mounting hardware, the LBS and the control cabinet and
cable shall be stated in the tender documentation.
8.3
Insulators
Aromatic epoxy resin with Silicone rubber boots Porcelain bushings and EPDM
rubber are not acceptable.
The 2 polymer post insulators must have a creepage distance of 900mm. All
insulators must conform to IEC 62231 and the relevant type test reports may be
furnished.
8.4
Finish
8.4.1
All interior and exterior ferrous surfaces of the LBS should be manufactured using
mild steel. The interior and exterior of control cabinets shall be manufactured from
316 marine grade stainless steel. All support structures, mild steel parts and
associated bolts and nuts with these parts, shall be hot-dip galvanized.
8.4.2 Suitable precautions shall be implemented to prevent corrosion due to the
use of dissimilar materials.
9.
Control equipment
9.1
Control cabinet
9.1.1 Cabinets
that
house
equipment
for
protection
and
control
shall
be
mounted independently of the LBS.
9.1.2 Suitable ultraviolet-resistant cable, 7 m long, shall be provided to connect
the LBS to the control cabinet. If shorter or longer cables are required, the length
will be specified in the tender documentation.
9.1.3 It shall be possible to disconnect the cable at the LBS while the LBS is
connected
to
the
power
system,
TN-01/118
without
causing
damage
or
malfunction.
9.1.4 Cabinets shall be adequately sealed and dust protected and shall be internally
treated to prevent moisture condensation.
The degree of protection shall be
suitable for purpose.
9.1.5 The supplier shall ensure that the equipment housed in the control cabinet can
withstand
the heating effect of direct solar radiation without causing failure
and/or malfunction.
Details shall be provided in the tender documentation. The
protection level should be IP-55 as per IEC 60259.
9.1.6 The cabinet shall make provision for bottom entry of auxiliary power cables. The
holes shall be suitably blanked off.
9.1.7 The cabinet shall be fitted with an external M10 earthing stud with a nut,
lock nut and a serrated washer.
9.1.8 The RTU will not be a part of the supply.
9.1.8 The door of the cabinet shall be fitted with a robust fastening arrangement
that is capable of being secured by a padlock that has a shackle of 8 mm
diameter.
9.1.9 The cabinet shall be easily removable for workshop repair purposes.
9.2
Electronic control equipment
9.2.1 The controls shall not suffer any damage if one or more poles of the load break
switch fail to respond to either a trip or a close command.
9.3
Motor operating mechanism
9.3.1 The motor should be mounted along with the switch on the pole directly
the main center operating rod of the switch. There should be no
extra
with
linkages
to
connect the switch with the motor operating mechanism.
9.3.2 The motor operating mechanism must be enclosed in an SS enclosure and should
be sealed accordingly to not allow any entry of water or dust.
10.
Local control and indication
10.1
The local control and indication shall be as given in Table 1.
Table 1:
Minimum specification of local controls and indications
1 Item
2 Features
Local control (See Note 1) Local/Remote
3 Remarks
2 position key switchable
LBS Open
Secure control
LBS Close
Secure control
0.1.1 Notes (preferable)
Note 1: The two-position switch (labelled as below) shall allow the LBS controller to be
set in the following modes:
Remote: In this mode a local operator can trip the LBS and change the mode. A remote
operator can trip or close the LBS.
Local: In this mode a local operator can trip and close the LBS. A remote operator can
only trip the LBS.
10.2
All local controls and indications shall be accessible in adverse weather
condition.
10.3
The LBS shall be provided with a detachable lever. Only after attaching that lever,
TN-01/119
the operator will be able to operate the switch locally. The lever has to be kept
securely with the person handling the switch remotely - who alone can issue it to
the authorized person so as to prevent any unauthorized manual operation of the
switch.
10.4
The LBS status shall be clearly visible from ground level.
10.5
Malfunction of the LBS shall not pose a safety hazard to the operator due to the
recoil or backlash of items such as external operating rods, cranks and levers.
10.6
Switches used for local control shall offer the type of control described in
1 i.e. secure or toggled control with clear marking for ON and OFF
controls.
11.
Power supplies
11.1
Test supply: The LBS shall accept an external AC 230 V 50 Hz supply.
11.2
Optional supply: The LBS shall accept an external DC 110/220 V supply.
12
Maintenance and commissioning
12.1
It
shall
be
Possible
to
disconnect
the
LBS
and
table
connect
a
simulated
switch to the control cabinet for testing purposes.
13
Rating plate
Each
LBS
shall
bear
a
rating
plate
of
an
intrinsically
corrosion-resistant
material, indelibly marked with the sea-level rating for which the
has been type tested. The rating plate shall be indelibly
14
equipment
marked with:
·
the manufacturer's name;
·
the rated voltage and rated current
·
the rated short time withstand current (short circuit level)
·
the rated short circuit making current
·
the equipment type designation and serial number of the LBS;
·
the mass, in kilograms;
·
the date of manufacture; and
·
auxiliary supply voltage (if applicable).
Additional information
The following shall be submitted with the tender.
14.1
Load break switch details
·
manufacturer;
·
type designation;
·
place of manufacture;
·
short time withstand current;
14.2
A schematic-wiring diagram of the LBS offered.
14.3
A general-arrangement drawing of the LBS offered.
14.4
Details
of
the
maintenance
and
operating
equipment,
procedures
needed and a detailed parts list of the various components.
14.5
A
description
manuals,
of
including
the
LBS
operation,
maintenance
with
schedules,
instruction
fault
and
detection
maintenance
characteristics,
communications facilities, the method of applying settings and controls, together
with any software required and the cost thereof. The software requirements
TN-01/120
shall be stated in the tender documentation.
14.6
A list of recommended spares and tools.
14.7
Details
of
technical
back-up
facilities
available.
These
details
shall
be
stated in the tender documentation.
14.8
Details of LV trip/close motor if available as an option
14.9
Power requirements for a close operation
14.10 The maximum achievable separation between the control unit and the
load
break switch.
14.11 Full details of the protocol implementation and the complete point database.
15
TESTS
15.1
Type tests
The load break switch shall have been type tested in accordance with, and found
to comply with, the requirements of IEC 62271-103 for the following, and the
appropriate values shall be stated in the tender documentation:
15.1.1 Dielectric Tests (BIL and Power frequency).
15.1.2 Measurement of resistance of the main circuit
15.1.3 Short-time withstand current test.
15.1.4 Temperature rise test
15.1.5 Mechanical operations.
15.1.6 Cable Charging and Line Charging Test
15.1.7 Mainly Active Load Test
15.1.8 Closed Loop Current Test
15.2
The control cabinet and associated electronics shall have been type tested
in accordance with IEC 60259.
15.3 All insulators shall have been type tested in accordance with IEC 62231.
15.4 Type Test records in the form of validated copies of test certificates issued by an
NABL approved / International accredited testing authority shall be submitted with
the tender documentation.
15.5 Only the tests conducted at NABL approved laboratory or an accredited
international laboratory shall be accepted.
16 Routine/Acceptance tests
16.1 Routine tests, as required in the relevant standards, shall be carried out as a normal
requirement of the contract
and, unless otherwise
agreed
upon, shall
be
witnessed by the purchaser or by his appointed representative. No additional
charge shall be levied for such tests or for the production or presentation of
documentation related to routine tests.
16.2 Duplicate copies of routine test certificates shall be supplied together with
the equipment when the latter is delivered to the final destination stated in the
order.
16.3 Mechanical Operating Test:
During these tests, which are performed without voltage or current in the main
circuit, it shall be verified, in particular, that the switches open and close correctly
TN-01/121
when their operating devices are energized or under pressure. It shall also be
verified that operation will not cause any damage to the switches.
The arrangement of the switch shall comply with specifications for the mechanical
operation type tests, refer to 6.102.1 of IEC62271-103. A switch having a poweroperating device shall be subjected to the following tests:
– at specified maximum supply voltage and/or maximum pressure of compressed
gas supply: five operating cycles;
– at specified minimum supply voltage and/or minimum pressure of compressed gas
supply: five operating cycles;
– if a switch can be manually operated besides its normal electric or
pneumatic
operating device: five manual operating cycles.
A manually operated
switch shall be subjected to the following test: 10
operating cycles.
During these tests, no adjustment shall be made and the operation shall be
faultless. It shall be verified that the position indication is operating correctly when
the switches open and close.
17 PACKING/DOCUMENTATION
17.1 Assembly
The switch must be factory assembled in all aspects including insulators, motor
mechanism, fixed and moving contacts, operating rods, springs, chamber etc.
17.2 Packing
All equipment shall be carefully packed to prevent damage or deterioration
during normal transportation, handling and storage.
Each container shall bear the following information on the outside of the
container:
o The address of the destination
o The gross mass, in kilograms
o The name of the manufacturer
o The purchaser's order number and port of destination
18 Documentation
Each LBS shall be supplied complete with the documentation as specified in
the specification, together with the routine test certificates specified in 2.29
19
Related IEC / Standards
IEC 62271-103 Standards for high-voltage switchgear and controlgear.
TN-01/122
SPECIFICATION FOR 11KV OUTDOOR LOAD BREAK SWITCH WITH REMOTE
COMMUNICATION CAPABILITIES
1
Scope:This specification covers requirement for outdoor pole mounted Load break switch
(LBS) with capability of being integrated with any SCADA system using FRTUs. The
load break switch shall be designed for pole mounted or substation installation. All of
the unit’s protection, control and metering functions shall be electronically controlled
within an integrated, modularized control unit. The load break should be capable of
effectively extinguishing the arc by injecting the air through the pressurized chamber.
Use of SF6 gas for either insulation or arc extinguishing is not permissible due to its
harmful greenhouse effects.
2
General:The LBS shall be suitable for use on non-effectively earthed and effectively earthed
networks and under the system conditions and service conditions as follows:
1
Rated Voltage
kV
11
2
Highest System Voltage
kV
12
3
Rated Normal Current
A
630
4
No. of Poles
3
Air Break Load Break
5
Switch Type
Switch
Tilting
Type,
Vertical
6
Operating Condition
Break, Outdoor Type
7
Applicable Standard
IEC 62271-103
-10 degrees C to +55
8
Temperature
1
9
min
degrees C
power
frequency
(Across / Phase-Earth)
kV
40 / 36
Lightning Impulse withstand voltage
10
(1.2/50 us) (Across / Phase-Earth)
kV
105 / 95
11
Rated Frequency
Hz
50
12
Rated Short-time withstand current
kA, s
16 for 3 seconds
kA
13
Short Circuit Making Current (TDma)
peak
40
14
Cable Charging Current
A rms
16
Mainly Active Load Breaking Current
15
(TD load 2 and TD Load 1)
A
630
16
Closed Loop distribution circuit current
A
630
17
Breaking/Interrupting Medium
Air
18
Isolating Medium
Air / Solid State
19
Insulator Type
Polymer
20
Minimum Phase to Phase distance
TN-01/123
mm
375
Minimum Isolating Distance (when in
3
21
open position)
mm
275
22
Creepage Distance
mm
450
23
Operating Mechanism
Motorized and Manual
Mounting of Motor / Motor Operating
On the Pole with the
24
Mechanism
switch
25
Closing Time
ms
< 750
26
Opening Time
ms
< 750
27
Suitable for future SCADA
Yes
28
Padlocking facilities
Yes
Construction:The R,Y,B three-phase of the load break switch is installed on one great sectional
galvanized square steel base, joint together with one integrative drive axis interphase to ensure for closing and opening three poles synchronously.
The arching chamber should be maintenance-free, which should operate at the time
of closing and opening. Being the heart of the load break switch, it should be
capable of extinguishing the arc formed when operated on full load. There shall not
be any requirement of external energy for holding the position CLOSE or OPEN. The
use of HV/LV solenoids is not acceptable.
Oil / SF6 is not acceptable for interruption or insulation purposes. The unit shall be
designed for M1 class for mechanical endurance.
Provisions shall be included for electrical close, and electrical and manual trip. Each
pole of the LBS shall be identical to allow complete replacement of any individual
pole, without disassembly or replacement of the other poles. All parts must be field
replaceable. The LBS shall be suitable for mounting on channel on D.P. Structure.
There should be no connecting rods / operating rods / down pipe which connects the
switch mechanism to the control box located below. The motor and gears should be
fitted with the switch on the pole with only wires coming down for connection with
the control box.
Each phase should have 3 insulators, 2 for fixed contacts and pads and 1 for
operation of the moving contact.
The fixed contact, moving contact and terminal pads must be made of hard drawn
electrolytic copper. The current density for fixed contact, moving contact and
terminal pads must be minimum 2.0A/sqmm.
4
Mechanism:The load break switch should compose of a disconnect blade, an arc extinguishing
chamber and an operating mechanism. The arc extinguishing chamber should be
made of insulating material with the merits of high electric performance, arcendurance and high strength. The chamber should have a built-in spring with fast
acting mechanism which ensures breaking of load current, hence being free from
TN-01/124
operating speed of the user. The arching gap and disconnect gap of the load break
switch should be parallel in the course of opening and closing.
This load break switch should be operate-able by a manual linking rod or motor
operating mechanism. There should be a visible gap of switch after opening to
produce functions of isolation and protection. The blade of the switch should use
press spring to assure enough connection pressure to the contact. By use of the
spring the operation should be made convenient, the blade stable and the reliability
of opening-closing operation should be guaranteed. The switch should open or close
under rated load current and not require any secondary protection device.
The load break switch should work on the principle of extinguishing the arc by a
blast of compressed air produced by the switch itself while opening the main moving
contact tube.
5
Solid Dielectric Insulation:The phase to phase shall be minimum 375 mm and adequate for meeting the
dielectric requirements. The creepage distance of insulators shall be minimum 450
mm to ensure the safety even in worst case failures of the quenching device. Use of
boots or screw on bushings to meet Creepage is not acceptable.
The switch will go through high vibrations due to fast operations and the high
creepage will give added safety.
The distance between pole to pole when the switch is open should take into
consideration of the case when the chamber does not operate.
6
Adding SCADA compatibility:The load break switch should be capable of being integrated with SCADA functions
using an FRTU (Feeder Remote Terminal Unit). The load break switch should be
capable of reporting switch ON/OFF status and should be capable of being operated
(OPEN/CLOSE) by GPRS function.
7
Control equipment
7.1
Control cabinet:The control cabinet of the LBS should be capable of locally and remotely operating
the LBS. It should be capable of sending the status of ON/OFF to the control room
at the substation through a wire.
The control cabinet should take an input of 220VAC/110VDC, which will be specified
in the tender document, which is used to operate the motor and send a logical 1 or
0 to the control room indicating ON/OFF respectively.
The control for the LBS shall be capable to be integrated with a high end SCADA
compatible numerical relay which has inbuilt UPS and power control electronics
cabinets that houses equipment for protection and control and shall be mounted
independently of the LBS.
The cabinet of the LBS should be capable of shall be adequately sealed and dust
protected and shall be internally treated to prevent moisture condensation. The
degree of protection shall be suitable for Outdoor installation. The cabinet must be
made of stainless steel. Mild Steel or Aluminium will not be acceptable.
TN-01/125
The door of the cabinet shall be fitted with a robust fastening arrangement that is
capable of being secured by a padlock.
The control must have Open and Close pushbuttons.
8
REQUIREMENTS
8.1
General
The load break switch shall be suitable for use on non-effectively earthed and
effectively
earthed
networks
and under the system conditions
and
service conditions as follows:
S. No. Item
Data
1
Operating Mechanism
LV Motor
2
Altitude
Up to 3000 m;
3
Ambient Temperature
Minimum- -10°C;
Maximum- 55°C;
4
Maximum Daily Variation
35°C;
5
Pollution level
Medium/heavy
(Special Applications);
6
8.2
Lightning Activity
High.
Mounting
8.2.1 The LBS shall be suitable for single pole/DP mounting.
8.2.2 The LBS shall be fitted with an external M12 earthing stud, complete with a nut,
lock nut and spring washer. The earth stud shall be welded to the tank for optimal
earthing connection.
8.2.3 The mass of the mounting hardware, the LBS and the control cabinet
and
cable shall be stated in the tender documentation.
8.3
Insulators
Aromatic epoxy resin with Silicone rubber boots Porcelain bushings and EPDM
rubber are not acceptable.
The 2 polymer post insulators must have a creepage distance of 450mm. All
insulators must conform to IEC 62231 and the relevant type test reports may be
furnished.
8.4
Finish
8.4.1
All interior and exterior ferrous surfaces of the LBS should be manufactured using
mild steel. The interior and exterior of control cabinets shall be manufactured from
316 marine grade stainless steel. All support structures, mild steel parts and
associated bolts and nuts with these parts, shall be hot-dip galvanized.
8.4.2 Suitable precautions shall be implemented to prevent corrosion due to the
use of dissimilar materials.
9
Control equipment
9.1
Control cabinet
9.1.1 Cabinets
that
house
equipment
for
TN-01/126
protection
and
control
shall
be
mounted independently of the LBS.
9.1.2 Suitable ultraviolet-resistant cable, 7 m long, shall be provided to connect
the LBS to the control cabinet. If shorter or longer cables are required, the length
will be specified in the tender documentation.
9.1.3 It shall be possible to disconnect the cable at the LBS while the LBS is connected
to
the
power
system,
without
causing
damage
or malfunction.
9.1.4 Cabinets shall be adequately sealed and dust protected and shall be internally
treated to prevent moisture condensation.
The degree of protection shall be
suitable for purpose.
9.1.5 The
supplier
cabinet
can
shall
ensure
withstand
that
the
the
heating
equipment
effect
without causing failure and/or malfunction.
housed
of
in
direct
the
solar
control
radiation
Details shall be provided in the
tender documentation. The protection level should be IP-55 as per IEC
60259.
9.1.6 The
cabinet
shall
make
provision
for
bottom
entry
of
auxiliary
power
cables. The holes shall be suitably blanked off.
9.1.7 The cabinet shall be fitted with an external M10 earthing stud with a
nut,
lock nut and a serrated washer.
9.1.8 The RTU will not be a part of the supply.
9.1.8 The door of the cabinet shall be fitted with a robust fastening arrangement
that is capable of being secured by a padlock that has a shackle of 8 mm
diameter.
9.1.9 The cabinet shall be easily removable for workshop repair purposes.
9.2
Electronic control equipment
9.2.1 The controls shall not suffer any damage if one or more poles of the
load
break switch fail to respond to either a trip or a close command.
9.3
Motor operating mechanism
9.3.1 The motor should be mounted along with the switch on the pole directly
the main center operating rod of the switch. There should be no
extra
with
linkages
to
connect the switch with the motor operating mechanism.
9.3.2 The motor operating mechanism must be enclosed in an SS enclosure and
should be sealed accordingly to not allow any entry of water or dust.
10
Local control and indication
10.1
The local control and indication shall be as given in Table 1.
Table 1:
Minimum specification of local controls and indications
1 Item
2 Features
Local control (See Note 1) Local/Remote
3 Remarks
2 position key switchable
LBS Open
Secure control
LBS Close
Secure control
10.1.1 Notes (preferable)
Note 1: The two-position switch (labelled as below) shall allow the LBS controller to be
set in the following modes:
TN-01/127
Remote: In this mode a local operator can trip the LBS and change the mode. A remote
operator can trip or close the LBS.
Local: In this mode a local operator can trip and close the LBS. A remote operator can
only trip the LBS.
10.2
All local controls and indications shall be accessible in adverse weather condition.
10.3
The LBS shall be provided with a detachable lever. Only after attaching that lever,
the operator will be able to operate the switch locally. The lever has to be kept
securely with the person handling the switch remotely - who alone can issue it to
the authorized person so as to prevent any unauthorized manual operation of the
switch.
10.4
The LBS status shall be clearly visible from ground level.
10.5
Malfunction of the LBS shall not pose a safety hazard to the operator due to the
recoil or backlash of items such as external operating rods, cranks and levers.
10.6
Switches used for local control shall offer the type of control described in table 1
i.e. secure or toggled control with clear marking for ON and OFF controls.
11
Power supplies
11.1
Test supply: The LBS shall accept an external AC 230 V 50 Hz supply.
11.2
Optional supply: The LBS shall accept an external DC 110/220 V supply.
12
Maintenance and commissioning
12.1
It
shall
be
Possible
to
disconnect
the
LBS
and
connect
a
simulated
switch to the control cabinet for testing purposes.
13
Rating plate
Each LBS shall bear a rating plate of an intrinsically corrosion-resistant material,
indelibly marked with the sea-level rating for which the equipment has
type tested. The rating plate shall be indelibly marked with:
14
·
the manufacturer's name;
·
the rated voltage and rated current
·
the rated short time withstand current (short circuit level)
·
the rated short circuit making current
·
the equipment type designation and serial number of the LBS;
·
the mass, in kilograms;
·
the date of manufacture; and
·
auxiliary supply voltage (if applicable).
Additional information
The following shall be submitted with the tender.
14.1
Load break switch details
·
manufacturer;
·
type designation;
·
place of manufacture;
·
short time withstand current;
14.2
A schematic-wiring diagram of the LBS offered.
14.3
A general-arrangement drawing of the LBS offered.
TN-01/128
been
14.4
Details of
the maintenance and operating equipment, procedures needed
and a detailed parts list of the various components.
14.5
A
description
manuals,
of
the
including
LBS
operation,
maintenance
with
schedules,
instruction
fault
and
detection
maintenance
characteristics,
communications facilities, the method of applying settings and controls, together
with any software required and the cost thereof. The software requirements
shall be stated in the tender documentation.
14.6
A list of recommended spares and tools.
14.7
Details of technical back-up facilities available. These details shall be stated in
the tender documentation.
14.8
Details of LV trip/close motor if available as an option
14.9 Power requirements for a close operation
14.10 The maximum achievable separation between the control unit and the load
break switch.
14.11 Full details of the protocol implementation and the complete point database.
15 TESTS
15.1 Type tests
The load break switch / sectionalizer shall have been type tested in accordance
with, and found to comply with, the requirements of IEC 62271-103 for the
following, and the appropriate values shall be stated in the tender documentation:
15.1.1 Dielectric Tests (BIL and Power frequency).
15.1.2 Measurement of resistance of the main circuit
15.1.3 Short Circuit Making Test
15.1.4 Short-time withstand current test.
15.1.5 Temperature rise test
15.1.6 Mechanical operations.
15.1.7 Cable Charging and Line Charging Test
15.1.8 Mainly Active Load Test
15.1.9 Closed Loop Current Test
15.2
The control cabinet and associated electronics shall have been type tested
in accordance with IEC 60259.
15.3
All insulators shall have been type tested in accordance with IEC 62231.
15.4
Type Test records in the form of validated copies of test certificates issued by an
NABL approved / International accredited testing authority shall be submitted with
the tender documentation.
15.5
Only the tests conducted at NABL approved laboratory or an accredited
international laboratory shall be accepted.
16
Routine/Acceptance tests
16.1
Routine tests, as required in the relevant standards, shall be carried out as a
normal requirement of the contract and, unless otherwise agreed upon, shall be
witnessed by the purchaser or by his appointed representative. No additional
charge shall be levied for such tests or for the production or presentation of
TN-01/129
documentation related to routine tests.
16.2
Duplicate copies of routine test certificates shall be supplied together with
the equipment when the latter is delivered to the final destination stated in the
order.
16.3
Mechanical Operating Test:
During these tests, which are performed without voltage or current in the main
circuit, it shall be verified, in particular, that the switches open and close correctly
when their operating devices are energized or under pressure. It shall also be
verified that operation will not cause any damage to the switches.
The arrangement of the switch shall comply with specifications for the mechanical
operation type tests, refer to 6.102.1 of IEC62271-103. A switch having a poweroperating device shall be subjected to the following tests:
– at specified maximum supply voltage and/or maximum pressure of compressed
gas supply: five operating cycles;
– at specified minimum supply voltage and/or minimum pressure of compressed gas
supply: five operating cycles;
– if a switch can be manually operated besides its normal electric or pneumatic
operating device: five manual operating cycles.
A manually operated switch shall be subjected to the following test: 10 operating
cycles.
During these tests, no adjustment shall be made and the operation shall be
faultless. It shall be verified that the position indication is operating correctly when
the switches open and close.
17
PACKING/DOCUMENTATION
17.1
Assembly
The switch must be factory assembled in all aspects including insulators, motor
mechanism, fixed and moving contacts, operating rods, springs, chamber etc.
17.2
Packing
All equipment shall be carefully packed to prevent damage or deterioration
during normal transportation, handling and storage.
Each container shall bear the following information on the outside of the
container:
o The address of the destination
o The gross mass, in kilograms
o The name of the manufacturer
o The purchaser's order number and port of destination
18
Documentation
Each LBS shall be supplied complete with the documentation as specified in
the specification, together with the routine test certificates specified in 2.29
19 Related IEC / Standards
IEC 62271-103 Standards for high-voltage switchgear and controlgear.
TN-01/130
TECHNICAL SPECIFICATION FOR HEAT SHRINKABLE TYPE CABLE
JOINTING AND TERMINATION KITS FOR XLPE CABLES
1.01
SCOPE:
This specification covers the design, manufacturing, testing and supply of HeatShrinkable type cable straight-through joints and cable end termination kits as per
IS:13573(Pt.2)/2011 suitable for use with and installation on 33 KV and 11 KV
XLPE aluminum conductor cables .
1.01.1 The
cable accessories
terminations,
either
specified in
indoor
this specification
or outdoor,
and
i.e.,
cable end
straight- through,
shall be
complete in all respects. Such complete set of accessories shall be termed as
kit hereinafter in this specification.
1.01.2 Termination and jointing kits shall be heat-shrinkable type of proven make
and of a design and type which have already been extensively used and fully
type tested. The offered
kits shall be easy in handling and simple to install
without much skill , with minimum tools at site.
3.02
TYPE :
3.02.1 Termination Kits & Joints shall be heat shrinkable type for 33 kV & 11 kV XLPE
cables suitable for Outdoor
and Indoor Cable End Terminations and
Straight
Through Joints
3.02.2 It is not the intent to specify completely herein all the details of the design,
manufacture & assembly of cable accessories; however, cable accessories shall
confirm in all respects to a high standard of design & workmanship and be
capable of performing in
continuous commercial operation up to bidders
guarantee in a manner acceptable
to the purchaser, who will interpret the
meanings of the drawings and specifications and shall have the power to reject
any works or material which in his judgment are not in accordance therewith. The
cable accessories offered shall
be complete with all components necessary for
the effective and trouble- free operations. Such components shall be deemed
to be within the scope of supplier's supply irrespective of whether they are
specifically brought out in this specification and/ or in
the commercial order
or not.
3.03
SYSTEM PARAMETERS
1
Nominal operating voltage
33 kV rms
11 kV rms
2
Maximum system voltage :
33 kV rms
12 kV rms
3
Frequency (Hz.):
50 +/- 1.5
50 +/- 1.5
4
Number of Phases
5
Type of Earthing
Solid
6
Environmental conditions
Humid
3
3
Solid
Tropical
Climate
with
atmosphere ,and/or , direct burial in
water- logged ground.
7
Basic Insulation Level
170 kV (Peak)
TN-01/131
75 kV (Peak)
polluted
3.04
SERVICE CONDITIONS
(A)
The cable accessories to be supplied against this specifications shall be suitable
for continuous & satisfactory operation under climatic conditions listed
S.No.
Particulars
i)
Peak ambient air temperature in shade (°C)
50°C
ii)
Minimum ambient air temperature (°C)
0°C
iii)
Maximum avg. ambient temp.
40°C
over 24 Hrs. in shade
below:
((°C)
(B)
iv)
Maximum temperature attainable by an object
60°C
V0
Maximum relative humidity (%)
100 %
vi)
Maximum altitude above mean sea level
1000 mtrs
vii)
Maximum wind pressure (Kg./Sq.Mtr.)
100
viii)
Number of months of tropical monsoon conditions
4 months
ix)
Average No. of rainy days per annum
100
x)
Average Annual Rainfall in cms.
10 to 100
The kits shall be provided with protection against rodent and termite attacks.
3.05 DESIGN FEATURES.
The
following
considerations shall
be
taken
into account in the design of the
product, material properties and the components of the jointing and termination kits.
i)
Electrical stresses at the screen cut back in case of XLPE cables shall be controlled to
a safe value. The stress control may be either through stress control tubing /
stress control cone or other suitable means. The bidder shall furnish details of the
technique
employed
straight-through joints.
by them for stress control in
cable- end terminations /
The application of stress control system shall be safe,
foolproof and independent of cable jointers’ skills. The stress control method
used should withstand expansion and contraction of the cable during load cycling.
ii)
The cable end termination and jointing kits shall be so designed so as to prevent
discharge/ leakage at the cut back and nicks / scratches on XLPE insulations. Full
details of the method of discharge prevention shall be indicated by the bidder in their
offer.
iii)
The cable end termination and jointing kits shall be so designed so as to give track
- resistant erosion and weather resistant protection to the cable insulation.
The
outdoor end terminations and straight through joints shall be totally sealed against
ingress of moisture of environment.
TN-01/132
iv)
All Outdoor End Termination kits as well as 33 kV Indoor End Termination kits shall
be provided with rain (weather) sheds or creepage-extending petticoats. These shall
be non-tracking , weather resistant,
hydrophobic
and
have
smooth surface to
deflect any water/ dirt etc. The design of these rain (weather) sheds or creepageextending petticoats shall avoid any shed to shed conducting path under heavy rain
conditions.
v)
The cable end terminations & jointing kits
shall
be class 1 as defined in IEEE
standard 48/1996 with latest amendments. Documentary proof shall be required to
prove compliance in this regard without which the bid may be ignored.
vi)
The lugs and ferrules provided should
be suitable for
compacted
conductors and
should withstand thermal short circuit of 250 deg. centigrade.
3.06
GENERAL REQUIREMENT FOR CABLE END TERMINATIONS
/ STRAIGHT-
THROUGH JOINTS.
i)
The term heat shrinkable refers to extruded or moulded polymeric materials
which are
cross
linked
to
develop
elastic
memory by irradiation method and
supplied in expanded or otherwise deformed sizes/ shapes, subsequently heating
in a strained
state to a temperature above the
shrink temperature resulting
in the material recovering or shrinking to its original shape.
ii) (a ) The stress control tubes used in heat shrinkable cable accessories shall have
volume resistivity of minimum 1,00,00,000
ohm meters for both terminations &
straight through joints. The relative permittivity shall be minimum 15. Bidder shall
furnish documentary evidence confirming adherence to these along with the offer.
Further, impedance of stress control
temperature
from
tubes shall not change over
a range of
0 °C to 125 °C. The stress control tubes must have a thermal
endurance equivalent to 35 years life. The impedance should also remain constant in
spite of the difference in stress which will exist within the sleeve due to heating effect
within the conductor and the temperature of the environment.
b) Bidder must submit graph showing effect on the impedance
value
of stress
control tube due to effects of stress, temperature variations and thermal ageing of
minimum 10,000 Hrs. with the offer.
c) Copies of test reports on the critical components used in the joints & terminations
be furnished as per as per IS:13573(Pt.2)/2011, be furnished along with the offer.
i)
The heat shrinkable polymeric material to be used for
external leakage insulation
between the high voltage conductors and grounds should be non-tracking, weather
and erosion
resistant
and hydro-phobic in
polymeric tubing, preferably
coloured red,
nature.
and
A
heat-shrinkable flexible
possessing non-tracking
erosion
and weather resistant properties shall work as an external covering for the cable
covers.
Rain - Sheds (skirts)
provided should be of same material as the non-tracking
tube specified in the paragraph above. Copies of test reports, confirming the nontracking tubes and rain-sheds (skirts) meeting the above requirements shall be
furnished along with the offer.
TN-01/133
ii)
Since the sealants or adhesives to be used between the heat shrinkable materials
and XLPE cable shall be exposed to high electrical stresses, they must be track
resistant. Documentary evidence shall be furnished in this regard along with the offer.
iii)
All cuts/ nicks inadvertently occurred to XLPE insulation must be rendered
discharge free by using suitable discharge suppression compound.
iv)
The heat shrinkable tubes may be either extruded or moulded type.
v)
The higher wall-thickness of heat shrinkable tubes / sleeves shall be preferred to
counter the effect of erosion due to pollution.
3.07 OTHER REQUIREMENT
i)
The kit shall be suitable for storage without deterioration at a temperature upto
50 Deg. C and shall have unlimited shelf life. Conducting paints having limited shelf
life are not acceptable.
ii)
Proper stress control,
stress
grading
and
non-tracking
arrangement in the
termination shall be offered by means of proven methods, details of which shall
be elaborated in the offer. Detailed sectional view of assemblies shall be submitted
along with the offer.
iii)
The straight through joints shall be suitable for underground buried installation
with
incorporated
through
joints
back-fill
and chances
should be absolutely
manufacturer shall use
of flooding
impervious to
by
water.
the entry
The
of
straight
water. The
proven technology and design to prevent entry of water
or any other liquid inside the straight through joints and cables.
iv)
The end termination kits shall provide for total environmental sealing of the cable
crutch and at the lugs end. The details of the environmental sealing provided shall
be submitted along with the offer.
v)
Provisions for effective screening over each core shall be made and the bidder shall
categorically confirm this aspect in the offer.
vi)
The materials and components not specifically
which are
stated
in
the
specification
but
essential for satisfactory operation of the cable shall be deemed to be
included in the kit without any extra cost.
vii)
The terminations / joints shall be of better
tracking resistant properties and fully
reliable earthing system to maintain continuous contacts with screening/ armouring
as the case may be.
viii) The armour / earthing arrangement shall form
part
of
the
terminations/
joints
and shall be protected from erosion either by suitable tape or tube.
ix)
The terminations/ jointing kits shall have provision for shield connection and earthing
whichever required.
x)
The fault level as well as duration withstand capacity of termination / jointing kits
should be
strictly matching with the parameters of cables for which the
kits are
intended to be used.
xi)
The trade / brand name of the manufacturer, shall be embossed / engraved or
suitably marked with
indelible ink / paint for the purpose of identification on the
tubings and components which are visible from the outside. The words “JVVNL” along
TN-01/134
with the trade / brand name
of
the manufacturer,TN No. , month / year of
manufacture, size etc. shall be suitably printed / marked on the kit packing/Cartoon
xii)
Suitable creepage extension/ rain protection
sheds
for outdoor cable end
terminations shall be provided.
xiii) Adequate provisions for eliminating the
chances of
entrapment
of air at steps
formed by semicon screen shall be made.
xiv) The terminations/ joints shall be supplied
in
kit
form.
All insulation and sealing
materials, consumable items, conductor fittings, earthing arrangements and lugs
etc. should be provided .
xv)
The bidder shall furnish the
constructional features of material offered.
xvi) An instruction manual in English and , optionally in Hindi script,
complete
method/
proceedings adopted
for
indicating
installation of kits, preferably
the
with
more diagrams/ pictorial presentation shall be supplied with each kit. Various items,
quantity thereof included in each kit must be indicated in the instruction manual /
packing slip provided in the kit packing.
3.08 CABLE SIZE AND ITS REQUIREMENT
If the design of the cable jointing kits is such that same kit is suitable for more than
one of the cable sizes mentioned at clause 3.06 , then the bidder shall furnish the
details of kit number and corresponding cable sizes for which the kit is suitable.
3.09
CIRCULAR
The
SHAPED CONDUCTOR:-
terminations/ jointing kits offered shall be suitable to be used on circular
compacted XLPE cable conductor.
3.10
LUGS/ FERRULES
Requisite number and size of lugs/ ferrules depending upon the type of the cable
shall be provided in the kit. Lugs and Ferrules shall be of crimping type, shall
confirm to the relevant standards in case of XLPE cables.
3.11
EARTH/SCREEN CONTINUIY
i)
Screen continuity by using tinned copper mesh and
earth
continuity by tinned
copper braids of appropriate size shall be provided for transfer
of screen/
earth in straight through joints.
ii)
Tinned copper braids of appropriate size
shall
be
provided
along with
copper
lugs of proper size
for the continuity of screen/ armour along with adequate
clamping arrangement.
3.12
EARTHING
Earthing shall be as per relevant standards and
the details of the earthing
arrangement offered for the cable accessories shall be submitted along with the
offer.
3.13
FIRE RESISTANCE
The cable end terminations and straight-through joints shall be fire resistant.
The components of kits shall have flame retardant property.
TN-01/135
3.14
INTERCHANGEABILITY
The components of different size of the kits shall be interchangeable between more
than one cable sizes in case the need so arises. Bidders should indicate the range /
limits of such interchangeability.
3.15
EASY INSTALLATION
The
bidder shall offer complete material and components for each kit so as to
make one termination/ joint complete in all respects. The bidder shall indicate the
list of the material/ components with the supplied quantities of each for each type of
cable end termination and straight-through joint.
i)
The detailed bill of material and installation instructions shall be provided with
each kit
for verification
by the purchaser's inspecting officer
and
at
Nigam's
stores / site.
ii)
All components shall be sealed separately and marked clearly for the purpose of
identification of each component. All components shall be supplied in a single
package as a complete kit for one termination/ joint
and
shall
bear the
manufacturer's name and the cable size or range of cable sizes for which the kit can
be used.
3.16 SUPERVISORY ERECTION & COMMISSIONING
The successful bidder shall provide free services of a trained jointer / foreman /
erector ( hereinafter referred to as jointer ) for installation / jointing all 33 kV cable
end terminations and straight-through joints. The jointer of the supplier shall be
duly trained and certified by the manufacturer for supervision of installation of the
cable accessories. The jointer shall direct the sequence of installation. The jointer
shall correct in the field any errors, omissions on the part of the bidder, in order to
make
the equipment and material perform properly in accordance with the
intent of this specification. The jointer shall be responsible for any damage to the
accessory during his work as well as for any damage resulting from faulty or
improper installation. The purchaser shall provide adequate number of skilled /
semi- skilled workers as well as all ordinary tools and consumable T&P items used in
the work such as LPG gas / kerosene. The purchaser shall not be responsible for
any other expenses such
as erector's insurance against personal injuries to
the jointer etc. Special tools such as LPG torch, if required for jointing, erection and
commissioning , shall be provided by the supplier at his cost.
3.17
GUARANTEED & OTHER TECHNICAL PARTICULARS
(A)
The successful bidder shall furnish the guaranteed and other technical particulars
of the kits offered by him. The particulars which are subject to guarantee shall
be clearly indicated. The bidder shall furnish the length of the tube used in the kits
in the GTP attached. The complete drawings indicating such length of tubing must
be also enclosed along with the type test reports duly authenticated by the testing
agency. Without schedule of GTP completely filled in, the bid offer may be ignored.
(B)
The bidder shall highlight the various technical aspects and salient features of the
kits offered by them.
TN-01/136
3.18
GUARANTEE
The cable end terminations and straight through joints shall bear guarantee for
five years from the date of supply of last consignment against purchase
order. Any
defect noticed in the
kit
shall
be
attended
by the supplier
immediately but not later than 24 hours in Jaipur city and not later than 3 days
in
other
places in the area of Jaipur Discom on receiving the complaint, and if
required, the kit shall be replaced and installed ( only for 33 kV ) free of cost;
otherwise the same will be arranged at the supplier's risk and cost. The successful
bidder
shall
furnish manufacturer's warranty on Rajasthan
Non-judicial stamp
paper worth Rs.100/- in a manner as detailed at clause No. 1.41 of GCC
3.19
TESTS
1)
TYPE TESTS
a)
The successful bidder shall furnish valid and authenticated type test certificate as
per IS:13573(Pt.2)/2011 from a Govt. approved/ a Govt. recognized/ NABL
accredited laboratory/ ILAC i.e. International Laboratory Accredited laboratory /
ILAC i.e International Laboratory Accrediation Cooperation ( In case of foreign
laboratory)
b)
The successful bidder should furnish documentary evidence in support of the
laboratory whose type test have been furnished, that the said laboratory is a
Govt/ a Govt. approved/ a Govt. recognized/ NABL accredited laboratory/
ILAC accredited ( in case of foreign laboratory)
c)
Such type test certificates should not be older than Seven years as on the
date of bid opening.
d)
Bids not accompanied with requisite type test(s) certificate not older than
Seven years as on the
date of bid opening, shall be treated as non-
responsive.
2)
ACCEPTANCE TESTS
A) The following tests shall constitute as Acceptance tests:
(i)
(ii)
(iii)
Visual examination
Verification of bill of material / kit contents.
Dimensional check including verification of lengths of tubes as given in the
GTP.
(iv)
Tensile strength
(v)
Ultimate Elongation
(vi)
Longitudinal shrinkages
(vii)
Dielectric strength
(viii)
Volume Resistivity
(ix)
Torchability / Recovery -as per manufacturer’s standard
(x)
Tracking Resistance ( as per ASTM 2303 )
The above tests shall be carried out in the presence
of the Purchaser's
representative as per relevant prescribed standards , latest amended and the
TN-01/137
sampling plan shall be 1% subject to minimum of one No. of assorted size/type for
each voltage rating i.e. 33 kV and 11 kV separately.
3)
ROUTINE TESTS
The bidder must specify the details of the routine tests being conducted at their
Works along with the standards applicable in their offer.
3.20
INSPECTION
The
supplier shall provide the facilities
to
carry
out
the prescribed
acceptance tests on selected samples from the lot offered at one or more
testing laboratories. The samples from the lot shall be selected by the
inspecting officer or the person authorized by purchaser.
All the tests shall be arranged and carried out as per the procedures laid down in
respective specifications as per latest amendment in the presence of purchaser's
nominee.
The
suppliers
accordance
should
with
satisfy
the
term
themselves
that
the material
offered
are
in
of contract and fully confirms to the required
specifications by carrying out a thorough pre-inspection of each lot before offering
the same for inspection to the purchaser. Such pre-inspection on the part of the
supplier shall minimise the chances of rejection during inspection.
3.21
LIST OF KIT CONTENTS
The bidder shall furnish the lists of kit contents and shall also confirm unlimited
shelf-life of the kits.
3.22 DEPARTURE FROM THE SPECIFICATION
Should the bidder wish to depart
from
the specification in any respect, he
should clearly state such departures indicating the reasons thereof. Unless this is
done, the departmental specification will hold good and shall be binding on the
supplier unless the departures have been approved in writing by the purchaser.
3.23 Applicable standards :
S.No.
Technical specification
Name of IS/other
material/equipment/
standard specification
Other
to
if any.
Machinery/T&P shall conform to which material should
conform
1.
Indian Standard Specification for
BIS: 7098
cross-link polythylene insulated
PVC sheathed cable (from 3.3 kv upto 33 KV)
2.
IEC Specification for plastic cables
IEC: 502
from 1 KV to 30 KV.
3.
Standard for power cable accessories
VDE: 0278 (PARTS I,II,IV,V)
with rated voltage upto 30 KV
4.
IEEE Standard Test Procedures &
IEEE
Requirement for Alternating Current
Cable Terminations 2.5 KV Through 765 KV
TN-01/138
48-1996
which
5.
Performance Specification for High Voltage ESI: 09-13
Heat Shrinkable components for use with
(with latest amended)
high voltage solid type cable upto &
including 33 KV
6
Indian Electricity Rules,1956
IE RULES
7
Specification for Compression type
tubular terminal ends for aluminium
BIS : 8308-1993
(with latest amendments)
conductors of insulated cable
8
Joints & Terminations of polymeric cable
for working voltage from 6.6 kv upto &
including 33 KV performance requirement
& Type test
TN-01/139
BIS : 13573-1992
TECHNICAL SPECIFICATION FOR OUTDOOR
TYPE 33 KV CTs
1.0
SCOPE:
This
specification covers the design,
manufacture, assembly
testing at
manufacturer's works before dispatch, supply and delivery of Single Phase 50 Hz
oil
immersed, self-cooled,
hermetically
Transformers for installation at
sealed, outdoor
various
type
33
KV Current
Grid Sub-stations of Jaipur Discom.
Consideration may be given to alternatives which the suppliers consider advisable
by reason of his own manufacturing requirements &
experience provided
descriptive
pointing
matter/
recommended
tests
device
this specification
and
certificates
are submitted
out
the
or arrangement equal to or superior to that required by
if the purchaser is convinced
of
the quality
and/or
superiority of the equipment. These equipment shall be suitable for installation in
system with neutral effectively grounded.
1.01
SCHEDULE OF REQUIREMENT:
The requirement of 33 KV CTs shall be as under:S. No.
Item
1.
33
Ratio
KV
Current
Transformers
400-200-100/5-5 Amp,
0.5s class.
The bidder should quote prices of above CTs with terminal connector suitable for
panther conductor.
1.02
STANDARDS:
The design, manufacture & testing of various equipments, covered by this
specification shall comply with the latest issue of following and other applicable
standards except the
value
wherever specified
shall
be considered relevant:-
IS:2705
Specification for Current Transformers
IS:2099
Specification for Bushing
IS:5621
Specification for hollow porcelain bushing.
IS:5561
Specification for electric power connectors.
IS:335
Specification for new insulating oil.
IS:4201
Application guide for Current Transformer.
IEC:60044-1 & 2
Instrument Transformers
Equipments conforming to other International and IEC Standards which ensure
equal or higher quality than the standard(s) mentioned above would also be
acceptable. In case the tenderer wishes to offer equipment conforming to other
standard, they shall furnish English translation of the relevant standards
1.03
CLIMATIC CONDITIONS:
The climatic conditions under which the equipment will be required to operate
satisfactorily are as under:-
i) The equipment offered by you shall conform in all respects to the relevant
Indian standards
specifications except
TN-01/140
where stated otherwise in the order.
Special care shall be taken in the design & manufacture of equipment to take into
account the tropical conditions such
dust &
salt
as
high temperature excessive
humidity,
laden atmosphere at detailed below:-
a)
Maximum temperature of air in shade
: 50 deg.C
b)
Minimum temperature of air in shade
: (-) 5 deg.C
c)
Maximum relative humidity
: 95 %
d)
Minimum relative humidity
: 10 %
e)
Height above mean sea level
: upto 1000 meters
f)
Dust storms are likely to occur
the period from March to July
g)
Average number of thunder storms
: 40
days/annum.
h)
Average number of tropical monsoon
: 4 months
conditions per annum.
i)
Average rain fall
: 10-100 cms. depending upon
area.
ii)
TROPICAL TREATMENT:
All the equipment shall be suitably designed and treated for normal life and
satisfactory operation under the hot and humidity Tropical Climatic Conditions
specified under clause No. 3.03
the parts
such
and surface which
material
and
shall be
above and shall be dust and vermin proof. All
are
subject
provided
to corrosion
with
shall
be made
such protective
finish
of
as
would protect the equipment installed from any injurious effect of excessive
humidity.
You shall supply all such minor accessories required for the completion of the
supply which have either not been specifically mentioned in this specification or
your tender offer.
1.04
TECHNICAL REQUIREMENTS FOR 33 KV CURRENT TRANSFORMERS:
i)
The Current Transformers shall be of Single Phase oil immersed self cooled
hermetically sealed & outdoor type suitable for the service conditions
indicated complete in all respects conforming to latest issue of IS mentioned
at clause 3.02 and modern practice of design & manufacture. The thickness
of tank sheet shall be minimum of 3mm.
ii)
The core shall be of high grade non-aging laminated silicon steel of low
hysterises losses and high permeability to ensure accuracy at both normal &
over current.
iii)
The Current Transformers shall be hermetically sealed to eliminate breathing
and prevent air and moisture from entering the tank. The method adopted
for hermetically sealing shall clearly be stated in detail in the offer. These
shall be provided with prismatic oil level gauge and pressure reliving devices
capable
for
releasing
abnormal
internal
pressure
where
necessary.
Arrangement for oil filling/ drain valve/ plug / hole shall be sealed to avoid
TN-01/141
leakage / pilferage of oil. The arrangement provided shall be indicated in the
tender. For load shedding single phasing is adopted in the system. The
offered CTs shall be suitable for working under such conditions.
iv)
For 33 KV CTs only live tank type design shall be acceptable
v)
PRINCIPAL
TECHNICAL
PARTICULARS
OF
CURRENT
TRANSFORMERS:S. No.
Description
1.
1.
Type of CT/Installation
Single Phase Live Tank oil
filled
PARTICULARS
hermetically
sealed,
outdoor type.
2.
Type of mounting
Steel Structure
3
Nominal system voltage
33KV
4
Highest system voltage
36KV
5
Rated Insulation level.
a.
One
minute
dry
power
frequency
70KV (rms)
withstands voltage.
b.
1.2/50 micro second Lightning Impulse
170 KV peak
voltage (KVP)
6
One minute High voltage power frequency
test on
a.
Primary winding (test voltage)
As per IS:2705/1992 (with
latest amendment)
b.
Secondary winging (test voltage)
As per IS:2705/1992 (with
latest amendment)
7
Frequency
50Hz.
8
Transformation ratio(s)
400-200-100/5-5A
9.
Method of earthing of system
Effectively earthed
10.
Rated
11.
12.
13.
continuous
Thermal
current(s)
120%
of
rated
primary
rating(s)
current (s)
a) Rated short time thermal current.
25 KA (rms) for 1 Sec.
b) Rated dynamic current (KAP)
62.5
Temperature rise for rated continuous
Within limits of
thermal current over an ambient temp. of
IS: 2705/1992 with latest
50 Deg. C.
amendments.
Total
creepage
distance
of
porcelain
900 mm
housing (Min.)
14.
Max. Creepage factor for hollow porcelain
4.0
insulator
15.
Core utilization for CTs having ratio 400-
CORE-I
CORE-II
200-100/5-5 Amp.
Metering
Back
protection
TN-01/142
up
a.
Rated burden VA
30
40
b.
Class of accuracy
0.5S
5P
c.
Max. instrument security factor
5
-
d.
Accuracy limit factor (max.)
-
15
vi)
Necessary magnetization curve for the relevant core(s) shall be furnished.
vii)
TEMPERATURE RISE FOR CURRENT TRANSFORMERS :
The limits of temperature rise of the windings, external surface of the core
and other parts of the current transformers when carrying a primary current equal
to the rated continuous thermal current at the rated frequency and with rated
burden shall be governed by the provisions of latest issue of IS:2705 (Pt.I). The
corresponding temperature rise for the terminal connectors shall not exceed at rated
continuous thermal current of the CT beyond the limits prescribed in IS:5561/1970
or latest issue.
1.05
CORES AND WINDINGS FOR ALL CLASS CURRENT TRANSFORMERS:
i)
The current transformers core to be used for metering and instrumentation shall be
of the accuracy class as specified. The saturation factor, instrument security factor
of this core shall be low enough so as not to cause any damage to measuring
instruments in the event of maximum short circuit current. Mu-metal or equivalent
material shall be used for this purpose. This factor shall not exceed to 5 on all
transformation ratio.
ii)
The current transformers cores to be used for protective relaying shall be of
accuracy specified. The cores shall be designed for a maximum accuracy limit factor
of 15 or min. knee point voltage specified as the case may be. The magnetization
curves for applicable core shall be furnished by the tenderer along with the tender
failing which offer is likely to be ignored.
iii)
The rating of the secondary winding shall be as per Clause No. 3.04(v) of this
specification. The secondary terminals shall be brought out in a weather proof
compartment on one side of current transformer for easy access and shall be
provided with short-circuiting arrangements. Required transformation ratio can be
achieved in any manner but the current transformers will have to satisfy the
requirement of rated VA burdens, class of accuracy, accuracy limit factor,
instrument security factor and short time thermal rating etc. as specified in Clause
1.4 (v) at all transformation ratio.
The minimum knee point voltage and maximum secondary winding resistance shall
correspond to the lowest ratio. In case tapings are provided on secondary side of
current transformers to get the designed transformation ratios, magnetization
curves corresponding to all secondary taps must be submitted with the tender.
Secondary windings resistances at such secondary tap shall also be clearly specified.
The secondary terminal box shall be provided with necessary glands with removable
gland plate for control cables. The secondary terminal box shall conform to IP-55
test.
TN-01/143
iv)
Primary winding shall be made out of high conducting copper. The design density for
short circuit current as well as conductivity for primary winding shall meet the
requirement of IS:2705/1992 or latest issue. However for primary winding current
density corresponding to the rated short time current shall not exceed 160
Amps./Sq.mm for copper conductor. Suitably insulated copper wire of electrolytic
grade shall be used for secondary winding. The tenderer should furnish details of
primary winding e.g. Number of primary turns, cross-section, short time current
density and normal continuous rated current density in the primary winding so as to
meet the requirement of IS. Winding shall have high mechanical strength for safety
against stress.
v)
The shape of external metal parts shall ensure that rainwater runs off and there is
no stagnation.
vi)
The requirement of current transformers of all classes regarding their ratio error,
minimum keen point voltage, exciting current at knee point voltage, maximum
resistance of secondary winding etc. shall have to be coordinated with the
requirement of the protective relay and protecting scheme wherever required
without any extra cost to the purchaser.
vii)
The CTs shall be of robust design, tested quality and reliable in operation. Only pure
high-grade paper would evenly under controlled conditions and impregnated with
mineral oil under vacuum shall be used for the main insulation.
1.06
FITTINGS & ACCESSORIES FOR CTs:
The CTs shall be provided with the following fittings & accessories:-
1)
2 Nos. bimetallic terminal connector with each CT suitable for horizontal & vertical
take off. The thickness of bimetallic strip/sleeve shall be of min.2 mm.
2)
Oil level gauge.
3)
Pressure release device if design recommended.
4)
Expansion Chamber or suitable type of device for absorbing variation in volume of
oil due to change in temperature of oil.
5)
Oil filling/ drain valve/ plug/ hole with sealing arrangement.
6)
Lifting lugs/ holes.
7)
Weather proof secondary terminal box fitted with hinged/ bolted door and complete
with terminals and short circuit arrangements. The secondary box hinged/ bolted
door shall have sealing arrangement.
8)
Two Nos. earthing terminals.
9)
Name & Rating plate showing details of connection diagram.
1.07 GENERAL REQUIREMENTS OF 33 KV CTs:
1.07.1INSULATING OIL AND BUSHINGS:
The quantity of insulating oil for first filling of each instrument transformer and
complete specification of the oil shall be stated in the tender. The oil shall conform
to the requirements of latest issue of IS: 335. The instrument transformers shall be
of standards duly filed in with oil. The oil filled bushing shall be of standard make
such as W.S. Industries, BHEL/MIL/Birla NGK/CJI/TEKMEK, KOLKATA. The bushing
TN-01/144
shall be suitable for operation in heavily polluted atmosphere with creepage distance
of minimum 25 mm per KV. The details of make and catalogue no. etc. of bushing
shall be clearly stated in the guaranteed technical particulars. Pressure of nitrogen
or any other inert gas used above the oil level to permit expansion or contraction of
oil along with device to detect any leakage if any shall be stated in the tender.
1.07.2
TERMINAL CONNECTORS:
The Instrument transformers shall be supplied with bimetallic terminal connectors
for both ends suitable for ACSR Panther conductor as per requirement and
confirming to IS:5561. Each terminal connector shall be suitable for both horizontal
and vertical take off arrangement.
The instruments transformers shall also be provided with two number earthing
terminals of adequate size, protected against corrosion and metallically clean.
Bimetallic strips or sleeves of suitable thickness to prevent bimetallic corrosion shall
be provided as a part of the terminal connectors.
1.07.3
PAINTING:
All ferrous parts of the Instrument Transformers exposed to atmosphere shall be
painted externally with one coat of anti rust abide paint (Primer) and two coats of dark
admirably grey paint (synthetic enamel paint of light grey shade No. 631 of IS:5). All
interior surfaces in contact with oil shall be painted with two coats of heat resistant oil
insoluble paint.
1.07.4TYPE OF MOUNTINGS:
The tenderer may submit their drawing / design for supporting structures of the
Instrument transformers offered by bidders.
1.08
NAME / RATING PLATE:
All items of the equipment includes in this specification shall be provided with rating
plates as per relevant standards. Rating Plate & terminal marking shall be as per
relevant IS. Purchase order / TN reference shall also be given.
1.09
TYPE TEST REPORTS
Certified copies of tests reports from any CPRI/ NABL accredited testing laboratories
of all type tests as per relevant latest standard mentioned under section-III clause
3.02 in respect of similar equipment (voltage class wise) included in this
specification along with bushing and terminal connector (if offered other than
approved make) shall be
furnished to adjudge the technical suitability
by the
successful bidder. The tenderer shall furnish necessary calculations on the basis of
STC test reports furnished above to prove the CTs of offered ratios are capable to
withstand the specified short circuit level. The type tests reports shall not be older
than 5 years. The type tests details are as under :
a) Short time current test
b) Lightening impulse voltage withstand test.
c) Temperature rise test.
d) High voltage power frequency (wet) withstand test.
e) Determination of errors or other characteristics.
TN-01/145
1.09
i)
INSPECTION & TESTING:
Each equipment covered under this specification shall comply with and shall be
subjected to all routine tests prescribed in the relevant Indian Standards
specification as mentioned in Clause 3.02 above.
ii)
In the event of order, supplier shall have to get all type test conducted as per
requirement of relevant standards on one sample out of first lot comprising
minimum 25% of ordered quantity in presence of inspecting officer without any
extra cost, at CPRI/ NABL accredited testing laboratories designated by
purchaser for which facilities exists in India unless otherwise it is waived by the
purchaser.
iii)
In case Bidder has furnished complete valid Type Test Reports of offered items
as per requirement of Specification & ordered quantity is less than 100 Nos, the
above condition of Type Test on 1-Sample from first lot comprising minimum
25% of ordered quantity in presence of inspecting officer without any extra cost,
at CPRI/ NABL accredited testing laboratories shall not be applicable. In case
Bidder has furnished BG in absence of Type Test then Type Test from first lot will
be conducted as per Clause No. 3.12(ii).
iv)
In case a bidder who has supplied 33 KV CTs of offered ratio and accuracy to
any three Discoms of Rajasthan during last 5 years from the date of opening of
a new tender and type tests have been conducted from 1st lot offered for
inspection than the condition of Type Test on 1 Sample from 1st Lot comprising
minimum 25% of ordered quantity in presence of Nigam’s Inspecting Officer
without any extra cost at CPRI/NABL accredited Lab as per clause No. 3.12(ii) of
Specification shall not be applicable upon them for the ratio for which type test
has conducted.
v)
Routine tests as per relevant standard shall be carried out on each equipment
covered by this specification in the presence of purchaser’s representative if
desired by the purchaser. All tests reports shall be submitted and got approved
vi)
During every lot offered for inspection, oil sample shall be drawn at random from
any one equipment and same shall be tested as per IS: 335 for a) Break down
voltage, b) Tan δ at 900 Centigrade.
vi)
One CT in each offered lot shall be opened for verifying the diameter and cross
sectional area of primary conductor including verification of GTP.
If CT fails in any of the tests/ verification at the works, the entire lot shall be
rejected.
vii)
Dispatch Instructions of inspected material shall be issued only after successful
type test reports.
1.13
TESTS AT SITE/ VERIFICATION AT STORES:
The purchaser reserves the right to carry out any site tests as he may decide at his
own cost and will claim reimbursement from the supplier, in case the material as a
result of such test / tests is not found conforming for the prescribed specification.
TN-01/146
Verification: - One CT in each offered lot received in Nigam’s stores shall be opened
for verifying the diameter and cross sectional area of primary conductor including
verification of GTP. If CT fails in above verification at Stores, entire lot shall be
rejected and supplier shall lift the rejected lot. In case it found within specified limit,
the supplier at his own cost shall reassemble/ replace the physically opened CT at
works/ stores.
The payment against supplies shall be released after obtaining successful store
verification.
1.14 GUARANTEED TECHNICAL PARTICULARS:
Guaranteed technical particulars for Instrument Transformers shall be furnished
by the successful bidder.
1.15 MATERIAL AND WORKMANSHIP:
All materials used in the manufacture of aforesaid equipment shall be of best quality
and capable of satisfactory operation under climatic conditions mentioned in Clause
1.03 above. The workmanship shall be of the highest grade and the practice.
1.16
COMPLETENESS OF EQUIPMENTS:
All fittings, accessories or apparatus which may have not been specifically
mentioned in this specification but which are usual or necessary for the equipment’s
shall be deemed to have been included in this specification. All equipment’s shall
complete in all respect.
1.17
LATENT DEFECTS, ERRORS AND OMISSIONS:
Any material / equipment or part thereof that developed defects, error or omissions
in the apparatus, not disclosed prior to the final acceptance by the purchaser, but
occur or are disclosed during the guaranteed period shall be corrected promptly or
the apparatus or part there of shall be replaced by the supplier free of charges and
all expenses for the transportation handling, installation of such replacement or any
other incidental charges shall be borne by the supplier.
1.18
GUARANTEE PERIOD & REPLACEMENT DURING GUARANTEE PERIOD:
Performance guarantee of the equipment shall be for the period of 36 months from
the date of receipt in stores. The month & year of expiry of guarantee period shall
be marked on the nameplate. Equipment failed within such guarantee period shall
have to be replaced free of cost within 45 days of intimation. You shall furnish
successful routine test reports of the equipment. If purchaser desires inspection
prior to dispatch an inspecting officer shall be nominated for verification for the test
reports. Transportation and lifting of defective material & delivery of replaced
material shall be borne by the supplier.
TN-01/147
TECHNICAL SPECIFICATION FOR 11 KV 3X185 sqmm CROSS-LINKED
POLYETHYLENE (XLPE) INSULATED POWER CABLES
1.
SCOPE:
1.1 This section provides for manufacture, testing before dispatch, supply and delivery
F.O.R. destination of ISI Marked 11 KV Aluminium conductor Screened, Cross
linked
Polyethylene (XLPE) Insulated Armoured Shielded PVC Sheathed cable of
rated voltage 11 KV (earthed system) conforming to IS:7098 (Part-II/1985) with
latest amendment. The 11 KV Aluminium Conductor, Screened CROSS-LINKED
POLYETHEYLENE (XLPE) INSULATED Armoured Shielded PVC Sheathed Power cable
shall be ISI marked.
2.
STANDARDS:
Unless otherwise stipulated in this specification the following standards with latest
amendments shall be applicable.
i)
IS:7098(Part-II)
: Cross
linked
Polyethylene
Insulated PVC sheathed cable
for voltage from 3.3 KV upto &
Including 33 KV.
ii)
IS:8130
iii) IS:5831
: Conductors
for
insulated Cables.
: PVC insulation and sheath of
Electric cables.
iv)
IS:3975
: Mild steel wires, strips and
tapes for armouring cables.
3.
v)
IS:10810
: Methods of test for cables.
iv)
IS:10418
:
Drums for Electric Cables
CLIMATIC CONDITIONS:
i) Peak ambient temperature
50 deg.C
in shade.
ii) Maximum average ambient
40 deg.C
temperature in a 24 hours period
in shade.
iii) Min. ambient air temperature in shade
iv) Maximum temperature attainable
(-) 5 deg.C
60 deg.C
by an object exposed to sun.
v) Maximum relative humidity.
100%
vi) Average number of thunder
40
storm days per annum.
vii) Average number of rainy days
100
per annum.
viii) Average annual rainfall
10 to 100 cm
ix) Number of months of tropical
Monsoon conditions.
TN-01/148
4 months
x) Maximum wind pressure.
100 kg/ sq. mm.
xi) Altitude not exceeding
4.
4.1
1000 M
GENERAL REQUIREMENT:
The 11 KV power cable shall be ISI Marked Aluminium conductor screened cross
linked polyethylene insulated armoured shielded and over all PVC sheathed. The
11 KV XLPE Cable shall conform to IS: 7098 (Part-II)/1985 with latest amendments
shall bear ISI Certification mark. The cable shall be capable of withstanding the
normal stresses associated with transportation, erection, reeling and unreeling
operations without getting deformed.
4.2
The 11 KV XLPE Cable shall be suitable for the following conditions of laying:
i)
ii)
iii)
4.3
Laid directly in ground.
Installed outdoor in free air in vertical position.
Drawn into underground ducts.
The 11 KV XLPE Power Cable shall be suitable for use
and
temperature
rise
where
ambient
temperature
due
to
conductor
temperature not exceeding 90 degree C. under
combination of
load
results
in
normal operation
and 250 degree C under short circuit conditions.
4.4
The cable shall be used on 11 KV earthed system.
The cables shall be suitable
for continuous operation at a power frequency voltage 10% higher than rated
voltage.
5.0
5.1
MATERIAL:
CONDUCTOR:
The conductor shall be composed of aluminium wires complying
with the requirement of Class-2 of IS: 8130/1984.
The bidder must guaranteed the minimum weight of Aluminium in Kg/Km
corresponding to nominal cross sectional area of conductor as mentioned in
the G.T.P.
5.2
INSULATION:
The
insulation shall be
requirement given in
5.3
cross linked
Table-1
polyethylene
conforming
to
the
of IS:7098(Part-II)/1985.
SCREENING:
The screening shall consist of one or more of the following:
i) Non-Metallic semi conducting tape.
ii)
Non-Metallic semi conducting compound and
ii) Non-Magnetic Metallic tape wire, strip or sheath.
5.4
FILLERS AND INNER SHEATH:
5.4.1 The filler and inner sheath shall be of the following:
a) Vulcanized or Un-vulcanized rubber or
b) Thermoplastic material.
5.4.2 Vulcanized or Un vulcanized rubber or
sheath shall not be harder than
sheath respectively.
XLPE
Thermoplastic
material
used
for inner
and PVC used for insulation and outer
The filler and inner sheath material shall be chosen to be
TN-01/149
compatible with the temperature rating of the cable and shall have no deleterious
effect on any other components of the cable.
5.4.3
The Central hole / void, if any, of the cable shall
be invariably filled with suitable
filler material so that there is no gap in the center.
5.5
5.5.1
ARMOURING:
The Armouring shall be of Galvanized Steel Strip.
5.5.2. Galvanized steel strips shall comply with the requirements of IS:3975/1979 with
latest amendments.
5.6
OUTER SHEATH:
5.6.1 The outer sheath shall be of Poly Vinyl Chloride (PVC) compound conforming to the
requirement of type ST-2 of IS:5831/1984.
6.
CONSTRUCTION:
6.1
CONDUCTOR:
The
Conductor
IS:8130/1984.
shall be of
stranded
construction
complying
with
Class-2 of
The aluminium shall be reasonably uniform in size and shape and
its surface be free from any sharp edges.
6.2
CONDUCTOR SCREENING:
The conductor screening shall be provided over the conductor by applying nonmetallic semi conducing tape or by extrusion of semi conducting compound or a
combination of the two.
6.3
INSULATION:
The Conductor (with screen) shall be provided with cross linked polyethylene (XLPE)
insulation applied by extrusion. The insulation shall be so applied that it fits closely
on the conductor (or conductor screening) and it shall be possible to remove it
without damaging the conductor.
thickness of
6.4
The thickness of insulation and tolerance of
insulation shall be as per Clause No.11 of IS:7098 (Part-II)/1985.
INSULATION SCREENING:
6.4.1 The insulation screening shall consist of two parts namely metallic and
non-
metallic.
6.4.2
Non-metallic part shall be applied directly over the insulation of each core and shall
consist of either a semi conducting
tape
or extruded semi conducting
or
a
combination of the two or either material with a semi conducting coating.
6.4.3
Metallic part shall consist of either tape or braid or concentric serving of wires or a
sheath should be non-magnetic and shall be applied over the non metallic part.
6.5
CORE IDENTIFICATION:
The core identification shall be done as per Clause-13 of IS:7098 (Part-II)/ 1985.
6.6
LAYING UP OF CORES:
The Cores (with screening) shall be laid together with a suitable right hand lay.
Wherever, necessary the interstices shall be filled with non-hygroscopic material.
6.7
INNER SHEATH (COMMON COVERING):
The laid up core shall be provided with inner sheath applied either by extrusion or
by wrapping. However, application of inner sheath by EXTRUSION shall be
TN-01/150
preferred. It shall be ensured that the shape is as circular as possible.
The
inner
sheath shall be so applied that it fits closely on the laid up cores and it shall be
possible to remove it without damage to the insulation. The thickness of inner
sheath shall be as per Clause No.15.3 of IS: 7098 (Part-II)/ 1985 (with latest
amendments.
6.8
ARMOURING:
The armouring shall be applied over the inner sheath.
The Galvanized Steel
Armoured strips shall be applied as closely as practicable. The direction of lay of the
Armour shall be left hand. A binder tape may be applied on the armouring.
The
dimensions of the galvanized steel strips shall be as specified in Table-4 of IS:7098
(Part-II)/1985.
The joints in Armour strips if any shall be made by brazing or
welding and the surface irregularities shall be removed. A joint in any strip
shall be at least 300 mm. from the nearest joint in any other armour strips in the
completed cable.
6.9
OUTER SHEATH:
6.9.1 The outer sheath shall be applied by extrusion over the armouring. The colour of
outer sheath shall be black.
6.9.2 The thickness of the outer sheath shall be as per Clause No.17.3 of IS: 7098 (PartII)/1985 with latest amendments.
7.0
TYPE TESTS:
7.1
The material offered, shall be fully type tested as per relevant standard of
specification of IS:7098 (Part-II/1985) amended up to date.
constitute type tests:
a) Tests of Conductor:
i) Annealing test (for copper)
ii) Tensile test (for aluminium)
iii) Wrapping test (for aluminium)
iv) Conductor Resistance test
b) Tests for armouring wires/strips.
c) Tests for thickness of insulation and sheath.
d) Physical tests for insulation:
i)
ii)
iii)
Tensile strength and elongation at break.
Ageing in air oven.
Hot test.
iv) Shrinkage test.
v) Water absorption (gravimetric).
e) Physical test for outer sheath:
i)
ii)
iii)
iv)
Tensile strength and elongation at break.
Ageing in air oven.
Shrinkage test.
Hot deformation,
f) Partial discharge test.
TN-01/151
The following shall
g) Bending test.
h) Dielectric power factor test:
i) As a function of voltage.
ii) As a function of temperature.
i) Insulation resistance (volume resistivity test).
j) Heating cycle test.
k) Impulse withstand test.
l) High voltage test.
m) Flammability test.
7.2
However, the purchaser reserves the right to demand repetition of same or all the
type tests in presence of purchaser’s representative.
7.3
The bidder must also clearly indicate various testing facilities available at their
works
for
otherwise
testing
the
material
as
per
relevant
particulars of the place where such
standards.
testing
is
In
case
proposed
of
to be
conducted during the course of inspection shall be indicated with the offer.
8.
INSPECTION (TEST BEFORE DISPATCH):
8.1
The inspection may be carried out by the purchaser at any stage of manufacturer.
The Inspection & Testing shall be governed by various Clauses of General Conditions
Of Contract.
Acceptance
of
any
equipment / material
under
this
specification by the purchaser shall not relieve the supplier of his obligation
of
furnishing
equipment
in
accordance
with
the specification and shall
not
prevent subsequent rejection if the equipment/material is found to be defective.
The following Acceptance tests as per Clause No.18.2 of IS:7098(Part-II)/1985
shall be conducted in presence of the purchaser's authorized representative /
agency on each lot of offered cables:
i) Tensile Test.
ii) Wrapping Test.
iii) Conductor Resistance Test.
iv) Test for thickness of insulation & sheath.
v) Hot Set Test for insulation.
vi) Tensile strength & elongation at break test for insulation and sheath.
vii) Partial Discharge Test (for screened cables only).
viii) High voltage test and
ix) Insulation resistance (Volume resistivity) Test.
x)
Test for Armour:
a) Verification of Dimension of Strip.
b) Tensile Strength & elongation at break.
c)
Uniformity of Zinc Coating.
d) Weight of Zinc Coating.
e) Winding Test on Armour.
f)
Resistivity Test on Armour.
TN-01/152
Cold impact test for outer sheath (IS:5831/1984) shall constitute the optional test
and shall be
conducted on
first
lot of the offered cables of each
size
as
per
Clause No.18.4 of IS:7098(Part-II)/1985.
8.2
ROUTINE TEST:The following shall constitute routine tests:
a) Conductor resistance test
b) Partial discharge test
c) High voltage test.
8.3
The bidder shall furnish Packing list mentioning serial Nos. of Drums,
length in each drum, gross weight of drum without lagging along with
inspection offer duly signed by the authorized representative of the firm.
The purchaser reserves the rights to insist for witnessing the acceptance / routine
tests of the bought out items.
8.4
At least 5% of total numbers of drums subject to minimum of two (2) in the lot put
up for inspection shall be selected at random to ascertain the length of cable by the
following method.
“At the works of manufacturer of the cable shall be transferred from one drum to
another for checking any manufacturing defects in the cable, at the same time
measuring its length with the help of the graduated pulley and cyclometer.
The
difference in average length thus obtained from the declared length by the supplier
in the packing list shall be applied to all the drums if the cable is found short during
checking the sample lot (s).”
8.5
The
supplier shall present the
latest
Calibration
Certificate(s)
of testing
instruments / equipment’s to be used for the testing of the material covered
in the Purchase Order to the authorized inspecting
of
the
officer/ inspecting
agency
purchaser. The testing instruments/ meters/ apparatus etc. should be got
calibrated by the supplier from time to time
from Govt. Laboratory or any
independent test laboratory/house having valid
accreditation
Accreditation Board for Testing and Calibrating
equipment’s
/
original
Laboratories
from National
for
the
testing
manufacturer having trace ability to NABL/NPL or
equivalent.
8.6
The calibration certificate(s) should not in any case be older than one year at the
time of presenting the same to the inspecting officer/ inspecting agency of the
purchaser.
The testing instruments/ equipment’s should be duly sealed by the
Calibrating Agency and mention thereof shall be indicated in the calibration
certificate(s).
8.8
TEST CHECKING OF MATERIAL AT STORES:
(i)
Sample drums
from the material received at stores shall be
selected for testing at CTL as per sampling plan given hereunder
in presence of firm’s representative. The selected sample drum /
drums shall be transported to CTL by concern S.S / ACOS of
Nigam.
TN-01/153
(ii)
The selected sample drum for CTL testing shall be identified by
the seals provided by Inspecting Officer / Inspecting Agency
during pre-dispatch inspection at firms works and these sealing
details shall be invariably mentioned in the selection Memo by the
nominated officers of Nigam.
The tests in the Nigam Testing laboratory (CTL) shall be conducted in the
(iii)
presence of representative of supplier for which a 7 days notice shall be
issued through Fax / Speed Post stating Date & Time to the firm, so that
supplier can depute their representative to witness the test . In case the
supplier or his representative does not turn up the testing shall be
proceeded & completed.
The payment shall be released only after
receipt of successful test reports for the samples selected at
purchaser’s stores for mandatory test checking on the samples to be
selected from material received at Nigam’s stores by officers to be
nominated by Circle SE’s / SE (I&S) for testing at CTL.
SAMPLING: One number Drum out of
(iv)
each lot / sub-lot of 25 Nos.
Drums or part thereof for the material received in Stores of Nigam.
TESTS: The following tests shall be carried out as per relevant clause of
(v)
latest IS on each selected drum by drawing sample of 10 Mtr. at CTL
from random distance during re-winding:
a) Rewinding test (Measurement of Length) & Checking of Manufacturing
defects.
b) Measurement of Resistance of conductor.
c) Tensile strength & Elongation at Break Test for Insulation & Sheath
d) Test for Thickness of Insulation & Sheath
e) Hot Set Test
f)
Test for Armour:
i)
Verification of Dimension of Wire / Strip.
ii)
Tensile Strength & elongation at break.
iii)
Uniformity of Zinc Coating.
iv)
Weight of Zinc Coating.
v)
Winding Test on Armour.
vi)
Resistivity Test on Armour.
g) Verification of Marking
In addition to above tests remaining acceptance tests as per relevant IS
shall also be conducted at CTL provided the testing facility is available at
CTL for these tests time to time. Only those tests shall be conducted for
which testing facilities are available in NIGAM’s Lab.
vi)
CRITERIA FOR ACCEPTANCE:
a)
If the measured of conductor resistance of
the sample(s) exceeds beyond
2% as per the resistance specified in the contract, the material shall be
rejected and the same shall have to be replaced by the supplier.
TN-01/154
b)
If
the measured conductor resistance of the sample(s) exceeds the
value specified in the contract but does not exceed by more than 2% of
the resistance value specified in the contract, the material contained in
the lot / sub-lot to
which the sample belongs shall be accepted with a
deduction @ 1.5% of the cost of cable for increase in resistance for every
1% or part thereof.
a)
If the sample(s) fails in any other test, the material shall be rejected
and shall have to be replaced by the supplier.
b)
If the contractor / supplier fails to lift the material declared rejected or any
part thereof from the consignee within a period of 15 days from the date of dispatch of
information from the purchaser, the purchaser shall be entitled to effect recovery along
with other actions as per Clause No. 1.62 of Section-II (General Condition of Contract).
c)
The results of measurement of length test shall be made applicable to all
drums contained in each lot / sub lot by making deduction of less length of cable in a
Sample Drum.
8.9
TEST CHARGES :
All test charges incurred towards test checking of the material received in
our stores shall be borne by the NIGAM.
9.0
IDENTIFICATION:
9.1
The manufacturer shall be identified throughout the length of cable as per
Clause No.20.1 of IS:7098(Part-II)/ 1985.
9.2 The cable code employed shall be as per Clause No.20.3 of IS:7098 (PartII) /1985.
10.0
EMBOSSING:
The cable shall also be required to
be
embossed with
the
word
manufacturer or Trade name, ELECTRIC/ Voltage Grade/ NAME OF
`Name
of
DISCOM/ TN-
cable code, size of cable & year of manufacture at every meter length for which no extra
charges shall be paid. The cable should be ISI marked & same should be embossed
on the outer sheet of every meter length of HT Cable.
11.
MARKING:
The progressive length of cable in meter shall be marked on the outer
sheath of every meter length of HT Cable.
12.
PACKING AND MARKING:
12.1
The cable shall be wound on a non returnable wooden drum conforming to
IS: 10418/1982 of suitable size.
The ends of cables shall be sealed by means of
non-hygroscopic material. Only one cable length shall be supplied on a drum. The cable
can also be supplied on M-Steel Drums as per relevant ISS as applicable.
12.2
The cable drums shall carry the following information either stenciled or
painted.
i) Manufacturer's name, Brand or trade mark.
ii) Type of cable and voltage grade.
iii) Number of cores.
TN-01/155
iv) Nominal cross-sectional area of the Conductor.
v) Cable Code.
vi) Length of cable on the drum.
vii) Direction of rotation of drum (by means of an
arrow).
viii) Gross mass.
ix) Year of manufacture.
x) ISI Certification mark.
xi) Purchase order/bid No. and
xi)
13.
Name of Consignee.
STANDARD LENGTH:
The cable shall be supplied in standard length of 250 Mtrs
in one Drum for size 11 KV, 3CX185 Sq.mm.
13.1
A tolerance of (+/-) 5% shall be allowed on standard length.
14.
GUARANTEED TECHNICAL PARTICULARS :
The successful bidder shall furnish guaranteed technical particulars as per the
specification and clearly mentioning the weight of aluminum as per MM wing of JVVNL.
15.
DRAWINGS & DOCUMENTATIONS:
The successful bidder is required to furnish the detailed constructional drawing of
cable clearly showing shape of core, type, size of fillers/ interstices along with Center Filler
etc. The calculations of weights of different components of the cable along with
weight of armouring and calculation of number of armour strips indicating Lay
Ratio & Lay Factor shall also be furnished. In absence of this, the bids are likely to
be ignored.
The drawing of drums shall also be furnished as per relevant
applicable ISS.
TN-01/156
TECHNICAL SPECIFICATION AND BILL MATERIAL OF
2POLE/ 4 POLE DT STRUCTURE
The structure to house the distribution transformer should be fabricated with the
following material as per the approved drawing.
S.No
Description
Quantity
2-Pole
4-Pole
1.
ISMB 150X75X2350
2
4Nos
2.
ISMC 125X65X1500
2
2 Nos
3.
ISMC 125X65X2000
2
2 Nos
4.
ISA 65X65X6
2
2 Nos
5.
ISA 65X6X1583
-
2 Nos
6.
ISA 65X6X1238
-
2 Nos
7.
Plate 400X400X12
-
4 Nos
8.
ISA 100X100X6
4
8 Nos
9.
Plate 120X120, 10mm thick
4
8 Nos
10.
Plate 250X250X12
2
4 Nos
11.
Plate 2000X1500, 5 mm
1
1 Nos
12.
PVC Pipe 140mm dia
2
2 Nos
13.
ISA 65X65X6 2000mm
1
1 Nos
14.
ISA 65X65X6 500mm
3
3 Nos
15.
Ladder for LT/HT cable
2
2 Nos.
16.
ISMC 125X65 1370 mm
2
2 Nos
17.
Leakage Oil Drain Tray 155X1000mm
1
1 Nos.
TN-01/157
TECHNICAL SPECIFICATION FOR NUMERICAL RELAY
The circuit breaker shall be fitted with shunt trip coil for operation on Numerical
Over Current and Earth Fault relay. The coils should be rated for 110VDC operation
on station battery.
Three phase protection relays shall be Numerical Over-current & Earth Fault
protection having 3 element for over current and one for earth fault protection with
instant trip. The setting for over-current shall be 50-200% (continuous range) and
for earth fault element from 5 to 80% (continuous range).
These relays shall be
non directional with selectable curve for all standard IDMT curves. The numerical
relays shall have following features:i. Self Diagnosis
ii.
Minimum last five abnormal events recording (over current & earth
fault) indicating fault current and phase, along with Date & Time.
iii.
On-line display of current.
iv.
Communicable with open Protocol having RS-485 port.
v.
Instantaneous Over-Current Protection with adjustable timer.
vi.
Breaker
Failure
detection.In-built
Circuit
Breaker
Trip
Circuit
Supervision function during pre closing and post closing of Circuit
Breaker.
vii.
DC supervision.
viii.
Very low burden on CT (less than 0.5VA)
ix.
Continuous monitoring of module’s internal hardware and alarm
generation in case of failure of any critical components.
x.
5 Digital Output contacts for local alarm as well as tele-signalling.
The relay shall be numerical type mounted in flush pattern on the panel board. The
relay should be rated for 5 Amp. CT secondary.
The relay should conform to
relevant ISS. The tenders shall furnish the detail in this regard along with the offer.
All the relays shall be provided with test blocks in panel so designed that the relays
may be tested in situ. The relays should have provision of testing either through
test block or test plug easily accessible by injecting the voltage / current/frequency
(as
applicable)
from
external
testing
instruments
/source
without
first
disconnecting/ reenergizing the primary electrical circuit protected by the relays.
Facilities for isolating the tripping circuit during such testing shall also be provided.
Relay TTB shall have trip bypass arrangement.
The requirement of test block shall not be applicable in case of drawout type relays
which can be tested by using test plug without removing the relay from its casing.
The testing facilities provided in the relays shall be specifically stated in the bid.
One test plug with five panels or part thereof are to be supplied.
The Following makes of Relays are acceptable:a.
Areva.
f. JVS
b.
ABB.
g. SEL
TN-01/158
c.
Easun Reyrolle
h. ASHIDA
d.
C&S
i. MEGAWIN
e.
Crompton
j. Stelmec
The technical suitability of relays/schemes may also be examined by Protection
Wing & acceptability will be judged appropriately.
The successful bidder must furnish type test reports as per relevant ISS/ IEC along
with bid to suit the environmental conditions of our State, in respect of the relay
(of the type and
design
offered)
which should have been type tested in NABL
accredited test laboratory in respect of such tests for which the lab has been
accredited (for Indian make Relays)/ CPRI/ Nationally accredited testing laboratory
(for Foreign make Relays). These type test reports should not be older than five
years from the date of opening of bid.
Bids without Type Test reports will be
treated as Non-Responsive. Any other equivalent make of relays shall also be
acceptable subject to prior approval of S.E. (JCC), JVVNL, Jaipur.
The scope also includes the necessary wiring to be done for the protection
scheme to be workable and SCADA compatible.
Desirable Features for Relay :
i)
Numerical 3 over current and Earth fault relay with instant trip.
ii)
Instantaneous Over-Current Protection with adjustable timer.
iii)
Breaker Failure detection.
iv)
In-built CB Trip Circuit Supervision function during pre closing and post
closing of CB.
v)
DC supervision.
vi)
Disturbance Recorder. Up 1 sec of actual waveform of current along with
logical and physical status, are captured & saved in the built-in memory with
date time stamping, for analyzing fault condition & fault location.
vii)
Fully communicable with IEC standard open protocol.
viii)
Separate Communication Port for SCADA (RS485) as well as Local testing
(RS232C)
ix)
Very low burden on CT (less than 0.5VA)
x)
Continuous monitoring of module’s internal hardware and alarm generation
in case of failure of any critical components.
xi)
Facility to synchronized Relay time from SCADA
xii)
5 Digital Output contacts for local alarm as well as tele-signalling.
TN-01/159
TECHNICAL SPECIFICATION FOR SHUNT TRIP SCHEME IN PLECE OF
EXISTING SERIES TRIP ARRANGEMENT
The 11 KV circuit breakers fitted with series trip arrangement shall be converted
into shunt trip coil arrangement for operation on Numerical Over Current and Earth
Fault relay. The coils should be rated for 110VDC operation on station battery. The
examining the existing protection scheme the bidder should furnish the shunt trip
arrangement scheme for approval.
TN-01/160