Download switches - (HOCL)

MAT/PUR/21162/08
17.11.2008
ONLY APPROVED VENDORS TO WHOM
ENQUIRY IS SENT BY POST NEED RESPOND. OTHERS CAN APPLY FOR VENDOR
REGISTRATION IF THEY SO DESIRE.
SUB: 100 V BATTERY CHARGER
Dear Sirs,
Sealed bids are invited for the supply, supervision or erection, testing and
commissioning of 110V, 20Amps Dual Float Cum Boost Battery Charger with
Integral DCDB as per technical specification Annexure-I (11 pages) enclosed.
The bids are to be submitted under two bid system. Techno-Commercial bid
enclosing the technical details of products quoted, signed and filled up copies
of Technical specification as per annexure-I, signed and filled up copies of
general
Terms and conditions as per annexure-II and all other relevant
documents with deviation if any. Price bid should enclose upto to delivery of
item to HOCL site. Charges for supervision or erection, testing and
commissioning of the system also to be given separately. Bothe the bids should
be superscribed with tender No. MAT/PUR/21162/08 dt. 17.11.2008 and put in
a third envelope.
The last date of submission of bids is 11.12.2008. The Technical Bids will be
opened in presence of the attending bidders on 12.12.2008 at 2 P.M. HOCL
after evaluation of Technical Bids will subsequently inform, all those who have
technically qualified,the date and time of opening of price bids.
Thanking you,
Yours Faithfully,
For HINDUSTAN ORGANIC CHEMICALS LTD;
K.R USHARANI
CHIEF MANAGER MATERIALS
Encl: a/a
(1)
TECHNICAL SPECIFICATION OF FLOAT- CUM- BOOST CHARGER
WITH INTEGRAL DCDB
There shall be two, exactly identical in specification Float- Cum- Boost Charges
(Charger 1 and Charger 2)
Housed in the same cubicle suitable for 55 nos. 150 AH tubular lead acid cells.
Input Supply
3 phase 4 wire input supply.
415 +/- 10% and 50 Hz +/- AC Supply. The charger shall be suitable for the AC
mains supply specified. The AC mains supply will be made available by HOC at the
charger panel.
Ambient temperature
:
Maximum - 40 C
Minimum - 27 C
OUTPUT
Voltage Regulation:
1. When working as a float charger
120 Volts D.C. +/- 1% (Settable between 110 V to 125 Volts) for float
Charging of 55 Nos. L.A Cells of 150 H capacity at 2.15 V/Cell and as well as
to simultaneously supply a D.C. Continuous load of 0 to 20 Amps (Max.) with
constant load bus voltage of 115 V
2. When working as a Boost Charger
110 to 152 Volts D.C to boost charge 55 Nos. L.A Cells of 150 AH capacity at
2.65 V/Cell with constant current, settable between 5A to 20Amps +/- 0.5A.
Voltage limiting 152 VD.C
3. During float charging the DC out put
Voltage across the load bus shall be maintained within +/- 1% of the specific
out put voltage for all loads between no load and under simultaneous AC input
Voltage Variation +/- 10% and frequency variation of +/- 5%
(2)
4. During boost charging the voltage across the load bus shall be maintained
constant 115V DC. The load bus voltage is to be maintained at 115V DC in all
condition. Charger voltage in excess of the specified load voltage of 115V DC
shall be maintained by using SMPS (Switched Mode Power Supply) / voltage
regulating device of specification.
Input
Output
Current
: 110 to 125 V DC
: 115 V DC
: 20 A
5. There should not be a failure of DC supply at load bus in the event of mains
failure during boost charging or float charging. This shall be ensured by
suitable DC link between battery and load.
6. Soft start feature shall be provide in the charger so that when the charger is
switched ON, the output voltage shall increase gradually from zero to final
value without any voltage over shoot.
7. The float charger circuit for lead acid battery shall be suitable for floating the
battery at about 2.15 V per cell while supplying continuous load. Facility shall
be provided for minor adjustment of float voltage to regulate the trickle
charging current and/or compensate line drop voltage.
8. The boost charger circuit shall be suitable for charging the battery at the
maximum charging current allowable for the battery. The boost charger shall
have facility to charge at constant current.
9. Float cum boost charger shall be rated for supplying the maximum allowable
charging current while supplying the continuous load specified.
10.The battery charger shall have both auto and manual modes with selector
switch. In the auto mode the solid-state circuits provided shall sense the
demand for more charging current persisting beyond a present time and the
charging operation shall go automatically to boost mode. Boost charging shall
automatically return to float mode after another present time.
11. In the manual mode of operation the boost charger shall have facility for
stepless control of the output current and voltage.
(3)
12. The performance characteristic of the charger units shall be such that the
Chargers at no time shall be overloaded .The overload shall be automatically
passed on to the battery by means of load limit feature incorporating reliable
quick response solid-state circuitry. Facility shall be provided to adjust the
Limiting current.
13. The mains transformer shall be double wound vacuum impregnated and dry
type, and shall be suitable for the AC mains supply specified .To facilitate
selection of correct mains voltage , suitable tapping shall be provided on the
primary side of the mains transformer with necessary selector switches.
14. Suitable filter circuits shall be provided to limit the ripple content of the DC to
3% and to suppress radio frequency interference.
15.The battery charger shall have standby charger units and incase of failure of
one charger the second one shall automatically come into operation, with out
interruption of load bus voltage, or under voltage in the load bus.
OTHER CHARACTERISTICS
Output ripple without battery :
Efficiency
:
Power factor
:
Insulation resistance
:
less than 3%absolute at full load
and maximum input voltage.
not less than 75%rated output
current.
not less than 0.8 lagging.
Not less than 2 megohms with a
500V D.C meggar between.
1. A.C. Input Terminals and Earth.
2. D.C. Output Terminals and Earth.
3. A.C. Input Terminals and D.C.
Output Terminals
(4)
PROTECTIONS
1. Reverse voltage blocked by a blocker diode i.e. Feed from battery to charger
locked.
2. Load limiting at 110% of max.rated capacity.
3. Ripples less than 3%
4. The components shall be selected to provide sufficient voltage capability
and ample current carrying capacity to furnish a reasonable margin for
handling over currents and voltage variations and limit temperature rise of
components to safe values.
5. Transient suppressing circuit and high speed fuses shall be used to protect
the semi conductor devices.
6. All semi conductor circuit shall be fuse or breaker protected so as to prevent
cascade or sequential semi conductor failures.
7. The battery charger shall have all the necessary built in protection such as
those against input over/under voltages, phase failures, over load, output
over/under voltages, battery over/under voltages, surges, short circuits, earth
faults, etc.
8. OUT LETS.
 Two pole DC isolation switch with HRC fuses of the 60 Amps 250V
ratings shall be provided for the purpose of isolation of DC
distribution bus at the charger panel.
 All DC distribution outlets shall be provided for various conditions as
specified.
(5)
Additional facilities
Visual alarms for : 1. Main Fail (Common)
2. Battery Earth Fault (Common)
3. DC Load Under Voltage (Common)
4. Phase Fail (CH-1)
5. AC Input Overload (CH-1)
6. Charger Fail (CH-1)
7. Rectifier Fuse Fails (CH-1)
8. Output Fuse Fail (CH-1)
9. Phase Fail (CH-2)
10.AC Input Overload (CH-2)
11.Charger Fail (CH-2)
12.Rectifier Fuse Fail (CH-2)
13.Output fuse fail (CH-2)
14.Receive attention-LA15
15.Ripples exceeds 3%
Alarm scheme provided shall be accept, rest and test facilities by means of Push
Buttons.
Earth leakage circuit shall consist of an Earth leakage relay, variable resistance,
center zero milli ammeter, isolator switch, indicating lamp, auxillary relay for alarm
initiation, etc.
NOTE:
o The audible alarm is common for above alarms. However, the visual
alarms are individual. The audible alarm is cancelable. but, the visual
alarm to continue till clearance of the corresponding fault.
o Separate potential free terminals for each alarm to be extended for
remote annunciation.
o The float cum battery charger is required to trip incase of faults
condition/ rectifier Fuse fail and output ripple exceeds 3%.
o One number reaper panel with audible& visual alarms for another
location is required.
(6)
HRC FUSES
All fuses shall be of link type HRC fuses provided in phenolic
molding fuse base and carrier with necessary viewing aperture.
i)
ii)
iii)
All important fuses shall be mounted on front surface of the
cubicle.
Rating of back up fuses shall be such as to provide sufficient
grading between successive stages wherever applicable.
SWITCHES
i)
All the switches provided shall be of normal duty Air break type and
shall be flush mounted on the front surface and neatly arranged with
the respective fuses in logical manner.
ii)
Indicator plates shall be provided for the switches for easy
identification of “ON/OFF” positions.
METERS
i)
All meters shall be of square type and of reputed make.
ii)
Necessary number of Ammeters shall be provided to measure
accurately,
a) Trickle charging current during float operation
b) Boost charging current
c) Load current
d) Battery charge/discharge current- with centre ‘O’ position.
iii)
AC Voltmeter with selector switch to measure mains voltages and
DC voltmeter with selector switch to measure the following shall be
provided.
a) Charger DC output voltages
b) Voltage across the Batteries
c) Voltage across the tap from battery, if any
d) Voltage across the load bus.
(7)
CONSTRUCTION
i)
The main transformers, charging circuits, DC outlets, switches, fuses,
contactors, relays, hooters and all other accessories of each charger shall be
accommodated in a separate self contained, self standing, floor mounted, damp
and vermin proof, sheet steel cubicle of folded construction.
ii)
The cubicles shall have hinged doors with locking facility at front &removable
cover at back.. All doors and removable covers shall be gasketed all round with
non-aging rubber/neoprene gaskets. The hinges shall be of concealed type.
iii)
Switches for the DC outlets shall be mounted on the front side. Labels shall be
provided for designating each outlet.
iv)
All controls and indicating instruments shall be flush mounted on the front side
& shall be arranged so as to give a neat appearance. Labels shall be provided
for designating each component mounted on the panel.
v)
All components shall be mounted with ample clearance in between them for
convenience of operation, inspection and maintenance.
vi)
Cubicles shall be provided with necessary internal panel lamps, with ON/OFF
switch and HRC fuses.
vii)
Anti condensation heater (suitable for AC mains supply specified) shall be
provided inside the cubicles with ON/OFF control switches and HRC fuses.
viii) The cubicles shall be designed suitable for the maximum ambient temperature.
Natural cooling is preferred for the cubicles.
ix)
All internal wiring shall be done with insulated copper conductors of minimum
size of 1.5 mm2 and shall be neatly clamped together and laid out nicely. Both
ends of wires shall be provided with numbered ferrules for identification.
x)
Printed circuit boards shall be of fiberglass epoxy, with plug in type
arrangement, with test options brought out for ease of circuit checking and
servicing.
(8)
xi)
The power conductors shall be PVC insulated and of adequate size to carry the
power currents.
xii) The maximum permissible current density shall be 1.25A/mm 2 for copper bus
bars and 0.78A/mm2 for Aluminium bus bars. The bus bars shall be colour
coded and PVC sleeved. The bus bars and bus bar supports shall be of nonhygroscopic materials.
xiii) The cubicles shall be complete with inter connecting cables, wires, and
necessary cable glands for incoming and outgoing cables.
xiv) Cable entry shall be from top with removable gland plate. Cable sizes shall be
as indicated.
xv)
The live parts shall be shrouded to ensure safety to personnel when panel doors
are opened for inspection.
xvi) Necessary nameplates giving relevant particulars of the equipment shall be
provided on individual equipment/component.
xvii) Duplicate earthing terminals and earth bus at the bottom shall be provided for
each panel.
xviii) Ventilation louvers provided shall have dust filters.
xix) Necessary foundation bolts, nuts, washers, etc. shall be supplied along with the
panels.
xx)
The paint and final colour shall be as specified in the data sheet.
xxi)
Facility for handling the equipment at site, such as lifting lugs, shall be
provided.
(9)
GENERAL
1. When either of the Chargers in ON in float Mode (or both the chargers
are OFF) its output gets connected to load and battery in parallel.
2. Whenever either of the chargers is in Boost mode. It’s output gets connected to
Battery only Boost Charging the same.
3. Manual selection of either of the charger to work in float mode and
simultaneously other charger gets selected to work either in boost mode only
or to remain OFF.
B) D.C.DISTRIBUTION BOARD
DC distribution outlets shall be arranged in the battery charger panel it self .
The charger control & accessories and DC distribution out lets shall be
segregated from each other to the extent possible No& ratings of outlets Shall
be as indicated.
Incoming feeders
: 2 Nos. 60 A double pole 250V DC Switch
and 50 A Fuse
Outgoing feeders
: 13 No.16 A 250 V Fuse Unit with 25 A DC double pole
rotary switch.
The DB shall have voltmeter, Ammeter for incoming feeder and LED indicator
for all out going feeder, marked and labeled.
C) MECHANICAL SPECIFICATION
Principal Dimensions
Tentative for character
With Integral DCDB
Finish
Mounting/Use
: Height -- 2000 mm
: Width --- 1200 mm
: Depth --- 600 mm
:
All iron work to be suitably pretreated for degreasing,
Pickling and phosphating and given two coats of primer,
There after, finally to be painted with two coats of epoxy
gray paint to shade No. 631 to IS: 5 1961 /Powder
coating.
: Self Standing, Floor Mounting for indoor Application.
Enclosure Protection :
Cable Entry
:
Dust and Vermin proof as per IP : 42
From top.
SCHEDULE OF RATES
Sl.No
Details
01
Supply, supervision of erection, testing
& commissioning of two exactly
identical in specification float cum boost
chargers with Integral DCDB with two
incomers and 13 outgoing feeders as per
the detailed specification attached
herewith.
(Including providing training at site)
02
Supply of recommended spares of the
battery charger (with price break up) for
the trouble free operation of the charger
for 2 years.
Qty
1 No
1 Set
Rate
Amount