Download Technical Specifications for the PF correction

Bid Document No. CE/DSPC/LTLMS/T- 19/05-06
MAHARASHTRA STATE ELECTRICITY
DISTRIBUTION COMPANY LTD
BID DOCUMENT FOR
LOW TENSION LOAD MANAGEMENT SYSTEM (LTLMS) IN
MAHARASHTRA STATE
VOLUME II
TECHNICAL SPECIFICATION
EXECUTING AGENCY
CHIEF ENGINEER,
DISTRIBUTION SPECIAL PROJECT CELL
MAHARASHTRA STATE ELECTRICITY DISTRIBUTION
COMPANY LTD.
MUMBAI
-1-
“Low Tension Load Management System” with
Thyristorised Switching System.
1.0 MSEDCL: Technical Specifications
These specifications are for 27 kVAr (3×9 kVAr) thyristorised capacitor
switched units to be connected on the secondary side (415 V) of 63kVA
distribution transformer and 36 kVAr (4×9 kVAr) system for 100kVA
distribution transformer. The unit should have the provision to add one more
9kVAr capacitor unit along with its necessary control and auxiliaries in both the
cases at a later date. The system provided should be 3-phase 3-wire and
recommended for no neutral connection requirement. The sites would be in
various parts of Maharashtra.
Distribution systems are 3-phase 4-wire system and typically unbalanced. The
compensating unit will be shunt connected with delta connected capacitor banks.
Each bank should be switchable through thyristors. The control algorithm
should be implemented on a digital platform preferably using DSPs. The
processor has to monitor total active and reactive power, overall power factor,
line currents and voltages etc. The processor should be able to meet the
computational demands of numerical protection required for the compensator,
the harmonics in the voltage and current signal seen in the compensator. The
specifications of such units are detailed in this document.
The equipment offered shall be totally enclosed, metal clad and completely
vermin – dust proof and suitable for continuous satisfactory operation in tropical
area of Maharashtra. It should at least IP-55 complaint. The equipment offered
shall be suitable for continuous satisfactory operation in tropical area of
Maharashtra for following prevailing worse case climatic conditions.
A Normal Atmospheric Condition: Dry for eight months and humid for four
months.
B Temperature: Maximum 50° C, Average 35° C
C Relative Humidity: 98% maximum
D Rainfall: 2000 mm concentrated in 3 months
E Basic Wind Speed: 60 m/sec.
2.0
Standards:
2.1
The Capacitor units shall comply with IEEE STD 18-2002 and IEEE STD
1036-1992 (or equivalent IS/IEC standards like IS: 13340/1998, IEC: 60831)
and other components including MCBs, Thyristors etc., shall comply with the
latest versions of relevant Indian Standards.
2.2
The Capacitor units shall be approved by NABL agency like CPRI / ERDA
tested or at internationally accredited testing Laboratory like KEMA or UL.
-2-
2.3
The measuring and controlling instrumentation equipments should be tested
for electrical measurement accuracy class of 1.0 from NABL approved
laboratory like CPRI / ERDA/ETDC etc for measurement standards.
2.4
Applicable standard IS-13410, 13411 etc. for enclosure’s cover in case of
Sheet Molding Compound (SMC) use as per clause 9.0 (Sub clause 9.4).
3.0
Basic Scheme:
The basic scheme is illustrated for convenience in Fig 1.
4.0
Capacitors:
The capacitors are proposed to be connected on the LT side of distribution
transformer. The nominal voltage is 3Φ, 415V, 50 Hz system. The system
frequency may vary from 48-51 Hz.
4.1
Capacitor Units (Manufacture and Construction)




4.2
The capacitor shall be either dry design heavy duty metalized
polypropylene self healing category or oil-immersed non-PCB type
and all polypropylene film capacitors. The metallization shall be done
preferably in-house to ensure good quality of metallization.
The capacitor units shall be three phase units.
The dielectric material shall be low loss less than 0.2 watts per kVAr.
The capacitors shall be covered for FIVE YEARS of GUARANTEE
against manufacturing, design or workmanship defects.
Capacitor Ratings and Service Conditions
The capacitors used should be consistent with the standards mentioned in
section 2.0. A few important aspects are emphasized below.
4.2.1
Capacitance Tolerance
The capacitance of the unit shall not vary more than -0 % to +10 % of
the nominal value based on rated kVAr, voltage and frequency
measured at 25° C.
4.2.2
Maximum Continuous Operating Voltage, Current and kVAr
Capacitors are intended to operate at or below their rated voltage.
Capacitors should be capable of continuous operation under
contingency system and bank conditions provided that none of the
following limitations are exceeded including harmonic contents.
 110 % of the rated rms voltage
 120 % of the peak voltage
 180% of rated rms current
 135 % of the rated kVAr
-3-
4.2.3
Insulation Classes
The BIL of the capacitor should be 25 kV.
4.2.4
Overvoltage and Overcurrent withstand Capabilities
Capacitors shall be capable of withstanding with full life expectancy
switching transients having crest voltages up to 2-times the peak of
the capacitor rated voltage, and other transient overvoltages and
overcurrents normally associated with the operation of shunt
capacitors.
4.2.5
Internal Discharge Devices
Capacitor shall be equipped with an internal discharge device that will
reduce the residual voltages to 50 V or less within 1minute after the
capacitor is disconnected from the peak of rated voltage. In order to
avoid human contact with charged capacitor, door interlock has to be
provided.
4.2.6
Radio Influence Voltage
RIV generated by capacitor shall not exceed 250 micro volts.
4.3
Testing
Compliance certificate from CPRI/ERDA on design tests and productions
shall be provided. The tests as per IEEE STD 18-2002 or equivalent IEC/IS
standards.
5.0
Capacitor Bank Protection;
Delta connected units which are popular at low voltages are configured with a
single series group of capacitors rated at line to line voltages. With only one
series group of units, no overvoltage occurs across the remaining capacitor
units from the isolation of the faulted capacitor unit. Therefore, unbalance
detection may not be required for protection, but may be used to detect outage
of the units with in the bank. In this arrangement, the individual capacitor
fuses shall be capable of interrupting the system short circuit phase-to-phase
fault current. This design may necessitate current limiting fuses. The
capacitor bank may be subjected to overvoltages resulting from abnormal
system operating conditions. If the system voltage exceeds the capacitor
voltage with capacitor bank online, the bank should be removed with
minimum time delay. The capacitors may be exposed to overvoltages as a
result of combined fundamental and harmonic content. The manufacturer
should be asked to furnish peak voltage stress levels as a function of time and
temperature. Also, protection against loss of bus voltage should be
considered. In the event single phasing the capacitor unit should be
disconnected. Lightning and switching transient overvoltages on capacitors as
well as thyristors should be controlled by using standard overvoltage
protection equipment, such as surge arresters. A capacitor bank generally
absorbs overvoltages because it acts temporarily as a short circuit for step
-4-
voltage changes. For additional information one may refer IEEE guide for
protection of shunt capacitor banks (IEEE Std C37.99-2000).
6.0
Thyristor Switched Block for 9 kVAr:
6.1
Thyristor Switch Rating
The continuous current rating of the thyristors used to switch the line
connected delta capacitor bank (9 kVAr) should be a minimum of 90 A rms
and they are of standard make like EUPEC/IRF/Mistubushi/Semicron/Hind
Rectifier. This number is obtained after taking into account the factor of
safety in design and de-rating factor for climatic conditions and life
expectancy of the equipment. The blocking voltage of the thyristor switch
during off condition should be a minimum of 1800V. Every thyristor switch
block should be capable of handling a minimum dv/dt of 1000Volts/s. This
is to avoid spurious turn on while powering up as well as due to supply
transients. These devices should be protected using switching aid networks
taking into account initial capacitor voltages and capacitor inrush current.
Thyristors used for every 9 kVAr bank should have independent heat sink.
Operating conditions such as no forced cooling, dusty weather condition etc
should be taken into account while determining the size of the heat sink. It
should be noted that the unit will be disconnected from the system if the heat
sink temperature rises beyond 75° C. Manufacturers will have to provide a
design document which outlines these issues and should be willing to
carryout necessary design modifications based upon the feedback of relevant
experts.
6.2
Differential Voltage Switching:
The thyristors should be turned on when the voltage across the device is less
than 6 Volts. Trigerring circuit should be immune to EMI and it should not
maloperate due to multiple zero crossings of the input voltage waveform if
any.
6.3
Response Time:
The time delay between turn off and subsequent turn on should in between 24 seconds. While turning on the unit, the inrush current should be minimum.
For this purpose, incoming phase voltage and voltage across the capacitor
have to be sensed. Under healthy conditions, turn on to turn off delay should
be of the same order as above.
6.4
Protection Against Supply Transients and Current Spikes:
The thyristor switching units should be provided with adequate protections
against any external transients that can cause current and/or voltage spikes.
In case of a power failure and subsequent restoration, the capacitor unit
should not be energized for at least 3-min after transformer energization.
Adequate arrangement of forced commutation to prevent the thyristors from
exceeding its I2t rating be present in every thyristor switched block.
-5-
6.5
Capacitor Over Current Protection:
Apart from the spike protection, every thyristor block should be protected if
capacitor continuous current remains above 130% for more than 1 minute.
This block should not have the auto restart facility.
6.6
Thyristor Damage Monitoring:
If thyristor gets damaged (short or open), the thyristor block should be able to
recognize the same and give a digital fault feedback to the ACU to log this as
faulty condition. In case of a thyristor failure, the corresponding compensator
should be taken out of service. An alarm indication should be made available
on the unit and GSM/GPRS.
6.7
Over-Temperature of Heat-Sink:
The heat sink on which the thyristors are mounted should be monitored
continuously for over temperature. If the temperature increases above the
specified limit fault that particular bank should be disconnected from the
system. The recommended trip level is at 75C. This fault should have an
auto-restart function once the temperature comes down below 65C or 15
minutes to avoid frequent hunting on resumption of operation.
6.8
Operational Conditions:


Mains voltage: Line to Line: 300V to 456V .
Min. temperature: 0C, Max. Temperature: 50C.
7.0
Controls:
7.1
All controls shall be mounted on enclosure door for easy inspection and
service.
7.2
All the control wiring in either Incomer/Control block or kVAr block should
be of adequate rating minimum of 1.5 sq.mm Copper insulated cable with
relevant IS standards. The cables used should have temperature-withstanding
strength of 85C.
7.3
Automatic Control Unit: ACU (Load Manager + Auto PF Controller +
Data Logger):
The functions of “Load Manager”, “Auto PF controller” and “Data Logger”
should be as a part of electronic controlling unit.
a)
The display in the front should be either backlit LCD,16
characters × 4 lines or suitable seven segment LED display.
This display should be clearly visible even in dark.
b)
Various display parameters and parameters settings to be
entered in the unit / units should be through front keypad,
which should be in front of ACU and should be user friendly.
-6-
The keypad can be either membrane type or flush type electromechanical switches. It should be enclosed and accessible to
only authorized personnel. The denominations on the keypad
should be clearly printed on the switches.
7.4
c)
The unit should be powered up through a 415V ac mains
supply and should be capable of giving the full functionality
from 70% to 115% of the mains Voltage range for continuous
operation. None of the control unit / units should require
neutral connection either for its auxiliary supply or for
measurement. This is because the entire scheme is without
neutral connection.
d)
The unit should be in an enclosed cabinet (metallic or plastic)
such that it should be seen as a free standing instrument/s. All
the control and supply terminals should be snap on type
terminals. ( No necessity to screw/un-screw the connections
for connection / removal). The housing should be such as no
internal electronics should be accessible for human touch from
any side of the unit / units.
e)
The unit should be capable of functioning and measuring with
specified accuracy for ambient temperature from 0C to +
50C and independent of internal inside temperature of the
panel. Temperature inside the cubicle should not exceed 55C.
This figure is arrived keeping in mind that capacitor life
reduces with rise in temperature. If the temperature increases
above this limit, the unit should be shut down and LED
indication on the panel, along with event trigger through
GSM/GPRS should be provided. The make of unit
manufacturer and the certificate from NABL approved
laboratory like CPRI / ERDA / ETDC etc for the said unit/s for
its temperature functionality should be furnished.
ACU: Function of Load Manager
a)
Should be capable of measuring the electrical parameters
through three phases, three wire system for A.C. Voltage and
through 5Amp Current Transformer (CT). Three CTs for line
current measurement would be placed in the secondary of the
distribution transformer as shown in Fig: 1. The use of single
CT is not advisable as the distribution system is inherently
unbalanced in nature. Therefore, other line currents cannot be
inferred from one CT alone. Additional CTs in the line end of
the compensator should be placed to achieve adequate control
and protection requirements of the compensator.
Manufacturers would have to provide a design document
which outlines these issues and should be willing to carryout
necessary design modifications based upon the feedback of
relevant experts.
-7-
b)
Should be able to measure and user friendely display the
following parameters.



7.5
RMS values of line voltages, line currents (I_r, I_y, I_b),
capacitor current (Ic_r, Ic_y, Ic_b), overall PF (measured and
displayed up-to two decimal digit), total kW, kVAr and kVA
of the system, C-kVAr (kVAr compensated by capacitors),
mains frequency (measurement and display up-to second
decimal digit), system kWh, kVAh and kVArh (energy
parameters cumulative value up-to minimum seven digits).
Unit should be able to display the Load side overall values for
PF, kVAr, kVA. i.e. the capacitor uncompensated values. (KW
of load and transformer should be almost same so need not be
displayed separately).
The measurement accuracy class of this unit should be
1.0class. The certificate from approved laboratory like CPRI /
ERDA / ETDC etc should be furnished for the measurement
with 1.0 class for following parameters.
ACU: Function of Auto PF Controller
a)
This unit should be capable of switching ON/OFF up-to (4+1) number
of Capacitor banks.
b)
The target PF setting should be a user defined parameter and should
be adjustable from 0.800 (lag) to 0.900 (lead). Very frequent turn
on/off of capacitor bank to track the target powerfactor may be
avoided.
c)
Unit should have the feature of auto-synchronization. In case of mains
supply phase reversal or in case of CT connections getting
interchanged or CT connections with wrong polarity, the unit should
be able to self correct itself for calculating the kVAr values and give
the correct compensation values. This should be achievable by the
unit without any manual intervention.
d)
The kVAr value calculation should be on the basis of deriving the
fundamental value of the current by removing the harmonic parts of
the kVAr. Every manufacturer will have to make a presentation
before an expert committee and get certification for pf correcting
algorithm.
e)
There should be LED indication for every bank control and status.
The capacitor bank status should be visible in front of the ACU by
various color LEDs. The status should be clearly differentiable
between the following bank conditions.
 Bank is On and is healthy.
 Bank is declared faulty and is masked.
 Bank is in discharging state.
 Bank is Off and is healthy.
-8-
f)
7.6
ACU should have the facility to accept upto 4nos.digital inputs as
fault feedback from thyristor switched block. In case of fault
feedback, ACU will keep the command to the specific bank in off
state and will try to compensate kVAr through other available healthy
blocks.
ACU: Function of Data Logger:
The data logger unit should consist of additional units of “data down-loader”
and “GSM/GPRS communicable Master Control PC software”
a)
The data logger should consist of Flash / NV RAM memory. The nonvolatile memory should be able to retain itself without refreshing for a
minimum period of 2 years.
b)
The data logger should be equipped with RTC (Real time clock) that
is capable of taking care of leap years and should not drift more than
30seconds per 30days time interval.
c)
The battery provided for RTC and / or NV RAM should have life
expectancy of 3 years.
d)
20 minute battery backup for GSM/GPRS communication system is
required to ensure transmission of data and subsequent shutdown
during power failure.
e)
The battery health monitoring should be provided as a part of this unit
and in case of fault, it should be displayed on front indication.
f)
Data logger should have serial ports (RS-232/RS-485) as well as USB
port. This should be either used for communicating with GSM/GPRS
modem wherever connectivity is available and suitable for data
transfer through PLCC or RF or other system or for data downloading
on down-loader. Data down-loader can be either a laptop or PC.
UNIT RATES FOR above communication with GSM/GPRS
COMMUNICATION SYSTEM SHALL BE QUOTED.
g)
The communication baud rate should be selectable from front
keyboard / display. For about a month of data to download on “data
down-loader”, the time taken should never exceed 5minutes. Thus,
communication speed should be sufficient enough to achieve this.
h)
The 30 minute interval records should store the following parameters.
 All three line voltages, currents and capacitor currents.
 Overall PF, kW, kVAr, kVA, C-kVAr.
 Number of banks On and Number of banks declared faulty.
 Fault status.
i)
The daily records should store the following parameters.
 kWh, kVArh, kVAh and C-kVArh energy parameters.
-9-

j)
kVAr values of Capacitor bank steps. That is banks should
be marked with numbers from 1, 2 --- up-to maximum
number of banks (depends on number of kVAr blocks
attached). And kVAr value of all these bank numbers
should be stored.
The event-triggered records would be storing the records at the
following events.
1. Any fault that trip off the capacitor banks.
2. Power down timing and Power up timing. (Both
records stored at power up)
3. Inadequacy of the compensation vis-à-vis set
power factor.
Under the event triggered records, following parameters would be
stored.




Voltages, Currents and Capacitor currents.
Overall PF, kW, kVAr, kVA, C-kVAr.
Number of banks on and Number of banks declared faulty.
Fault status.
k)
The GSM/GPRS modem should be suitable for communicating with
the main system on SMS mode of communication. The data logger
unit would be communicating with these modems with standard AT+
command sets.
l)
The GSM/GPRS communication with Master Control unit (MCU)
would be initiated by data logger. Whenever, the interval record is
stored, the data logger would send the same information that is stored
in interval records to the MCU. In case of fault record too, data logger
would pass the fault record information to MCU via modems.
m)
The record request query from MCU to the data logger would be
catered immediately by the unit and should send the instantaneous
values at that time with the type of parameters as in interval records.
n)
Data stored in the data logger should be in raw data format so that the
256KB space should be able to store the interval records and daily
records for a period of 2 complete months, in addition to this the last
500nos. event triggered records should be stored on the memory.
o)
GSM/GPRS communication software at Master control PC:
This software should be having following facilities and Vendor is
required to give 2 copies of installation CD ROMs along with
installation instructions.
1. Software should be able to work on any version of Microsoft
Windows. (Windows-95, Windows-98, Windows-98SE, Windows2000, Windows-ME, Windows-XP)
- 10 -
2. If any additional software support of the database package if required,
then it should be provided along with the Installation CD-ROM.
3. It should be able to work with any windows based PC which has
minimum configuration as: 128MB RAM, One RS-232 COM port,
52X CD-ROM reader, 20GB HDD and other standard functions.
4. The installation CD-ROM should have auto-launch feature and
Vendor should provide the license to MSEDCL for usage of this
software.
5. The software should be able to communicate with GSM/GPRS
modem through USB port and should be capable of handling any error
signals without having any “communication error” bugs.
6. The software should be able to handle at least 60 SMS/minute and
should be able to store all the records in appropriate database.
7. The software should have the facility to communicate on LAN and
should work with SQL server database for data storage. Packages like
MS-Access, Fox-pro etc. with present structure would not be able to
handle the bigger volumes of data so Vendor should look into this
technical angle before suggesting any alternate database packages. If
alternate database package is suggested, it should be supported with
proper technical explanation.
8. The software package should have the facility to configure itself for
specific area zones and specific key personnel cellular number to send
them the fault error SMS
9. It should be possible to view the records in proper chronological order
for any selected panel.
10. Software should give facility to its operator to request present
information from any data logger at site.
11. The graphical view of various parameters that are logged in and the
exceptional reports along with the printing option should be part of
this software.
12. Software should be able to keep the track of four different types of
records per RTU (Remote terminal unit: data logger at site). These
four types are
(a)
Interval Records.
(b)
Daily records.
(c)
Event triggered records.
(d)
Requested Records.
13. The viewing of the records in either tabular or graphical format should
be for user defined date range for a particular site.
14. On report generation and viewing of the records (tabular or graphical),
vendor should consult MSEDCL and vendor for such
changes/alterations while quoting for this tender should make
provision.
7.7
GSM/GPRS Modem:
The GSM/GPRS modem would be supplied by the bidder as a part of
LTLMS. The modem should be same or better than the one used in the
performance sample unit supplied. This modem would be charged with
415Vac supply.
- 11 -
These modems work with standard AT+ commands sets through serial
communication. The vendors should contact MSEDCL for getting the
information on this serial communication for the type of modems supplied.
7.8
Current Transformers:
a) Mains Current Feedback CT: These should be epoxy molded resin cast CTs
with bar primary. The inner diameter should be suitable for connecting it
around the bus-bar terminations at the output of distribution transformers. The
CT should be suitable for mounting in open air installations and should not be
affected by rain, dust and direct sunlight.
The Primary rating of this CT should be 100Amp for 63kVA transformer
(27kVAr system) and should be 160Amp for 100kVA transformer (36 kVAr
system). The VA rating of this CT should not be less than 5VA with secondary
current rating as 5Amp. for full rated primary current. The secondary terminals
provided should be non-rusting and water-proof type terminals and suitable to
work in outdoor installations.
There should be provision of mounting the CT either on the primary current
carrying bus-bars or primary current carrying insulating cables.
The CT should be 0.5 class accuracy and should have the current sensing
linearity in the specified accuracy range from 1% to 120% of its rated current.
It should also comply with the specific IS standard for 0.5 class CT.
b) Capacitor Current Feedback CT: This should also be epoxy molded resin
cast CT. The CT should be of minimum 5VA rating with 5Amp. as secondary
current for 100 Amp primary current (for 27 kVAr) and 125A (for 36 kVAr).
The CT should be 0.5 class accuracy and should have the current sensing
linearity in the specified accuracy range from 1% to 120% of its rated current.
It should also comply with the specific IS standard for 0.5 class CT.
c) The terminations for both the CTs in LTLMS should have the provision to
short the CTs.
8.0
Switchgear:
Individual capacitors of 9 kVAr rating shall be protected by a 3 pole 25 A, C
series, 9 kA MCB of reputed make like Siemens/Schneider/ABB.
9.0
Enclosure:
9.1
The enclosure shall be made from min. 2 mm CRCA Cold Rolled sheet steel
and angles/channels so that it can be safely mounted on pole. The mounting
arrangements, panel color shade details may be obtained from MSEDCL.
9.2
The panels shall be suitable for outdoor duty of IP-55 or better.
9.3
Capacitor units shall be housed in a separate compartment in the main cubicle
and elements accessible for inspection or replacement and capacitor units
shall be fire and explosion proof.
- 12 -
9.4
The enclosure should be covered with FRP or SMC or any metallic enclosure
to prevent it from direct sunlight as well as rain water. Temperature inside the
cubicle should not exceed 55C.
9.5
The enclosure shall have adequate safety arrangement for locking. As panels
may be commissioned in remote area, adequate provision should be made for
prevention of robberies.
9.6
A caution board as per IE rules shall be affixed on the front door in English
and local language (Hindi and Marathi).
9.7
The enclosure should have the entire instruments fascia visible through a
transparent unbreakable plastic sheet. The instruments as well as switches
should not be accessible unless the door is opened.
9.8
Surface Treatment and Painting:
9.8.1
All steel surfaces shall be thoroughly cleaned by sand blasting or
chemical agents, as required to produce a smooth surface free of
scales, grease and rust.
9.8.2
The terminal surface in contact with insulating oil shall be painted
with heat resistant insulation varnish, which shall neither react and nor
be soluble in the insulating liquid used.
9.8.3
The paint shall not scale off or crinkle or be removed by abrasion due
to normal handling.
9.8.4
Surface Pre-Treatment: The pre-treatment process shall include
following procedure.
a) Degreasing
b) Water Rinse,
c) Acid Cleaning (De-Rusting Treatment )
d) Water Rinse
e) Surface Activation,
f) Phosphating, (The phosphating process shall be an
accelerated process as per relevant IS).
g) Water Rinse,
h) Passivation
9.8.5
Powder Coating: The manufacturer shall use powder coating. The
powder coating shall be as per IS:13871. The material used shall be
polyester based Grade-A: Glossy Finish. The thickness of powder
coating shall be Min. 70 micron. The powder coating shall be
suitable for continuous outdoor use for tropical area.
9.8.6
Two numbers of enameled caution boards shall be supplied by the
purchaser and shall be fitted on front and rear side of the cubicle by
the supplier.
- 13 -
9.9
Every enclosure should be provided with proper earthing terminal such that
Aluminum earthing strip can be moved along every block and be connected
with ease.
10.0
Power Connections and Control Connections:
10.1
The control wiring should be by usage of stranded minimum1.5sq.mm
insulated copper cable.
10.2
All the bus-bars used in the panels should be of 99.99% pure electrolytic
copper. The size of the bus-bars used should be 15 mm X 3 mm and should
be covered by heat shrinkable color coded sleeves.
10.3
The cables used for connection to MCB’S, reactors, thyristors and Capacitors
should be of insulated Copper cables of adequate capacity. These should be
from the reputed makes like CCI, Finolex, Polycab, Varsha etc.
11.0
Performance Features
11.1
10% variation in line voltage shall not affect the life of the capacitor.
11.2
Rating plate: Each unit shall be fitted with a rating plate giving clearly the
particulars specified for marking as per IEEE Std 18-2002
1) Rated Voltage, Rated Current, No. of phase, Rated frequency
2) Temperature rise in Deg. C {limits}
3) Total Weight
4) Manufacturers Name
5) Manufacturers Sr. No.
6) User Name:
7) Users Purchase Order No. and date
8) Connection Diagram
9) Month and Year of Manufacture
10) BIL
11) Flammability classification
12) Class
13) Statement that capacitor contains internal discharge device.
14) Guarantee period and guarantee valid up-to ________ {month
and yrs.}
12.0
Installation and Maintenance Instructions:
The supplier on whom an order is placed shall provide per panel 5 sets of
detailed instruction books and drawing covering all the aspects of the
installation and maintenance of the capacitor and the associated equipment’s
per Panel that includes all the blocks (Incomer/Control block and kVAr
blocks). The same document shall also be submitted in PDF/softcopy format
after approval.
- 14 -
13.0
Testing:
13.1
All Test shall be carried out to conform with IEEE STD 18-2002 (or
equivalent standards mentioned in standard section) at manufacturer’s works.
Tests shall be performed in presence of Employer’s representative, if so
desired by the Employer. The bidder shall give at least fifteen (15) days in
advance notice of the date when tests are to be carried out.
13.2
In-Process Inspection Call: Manufacturer shall submit process-wise
manufacturing schedule along with dates. The in-process inspection call shall
be submitted minimum 15 days in advance. Employer’s representative if so
desired by MSEDCL may carry out such inspection.
Production Test
Production tests shall be performed by the manufacturer on each capacitor
and shall include the following:
1. Short Time Overvoltage Test
2. Capacitance Test
3. Leak Test
4. Discharge Resistor Test
5. Loss Determination Test
13.3
Design Test
Design test shall be performed by the manufacturer to demonstrate
compliance of the design. Capacitors shall first meet production test
requirements before being subjected to design tests. The design tests shall
include the following:
(i) Impulse Withstand Test,
(ii) Thermal Stability Test,
(iii) Short Circuit Discharge Test
(iv)Voltage Decay Test.
13.4
Certificates for Auxiliary Components Type Tests: The manufacturer shall
produce the latest test certificate for type test from a recognized laboratory for
all the components and auxiliary equipment to be supplied with the capacitor
bank. Type test certificate shall be considered valid for 5 years from the date
of test performed on the material.
13.5
Routine Tests: Following test shall be carried out as routine test as
IS:13340/1998, on every capacitor bank supplied.
13.5.1 Mechanical Test:
a) Checks of all mounting plates / fasteners.
b) Checking of components as per drawing.
c) Electrical circuits fasteners tightness / surface area contacts.
d) Crimping and ferrules as per drawing.
e) Labels / identification / nameplates,
f) All doors checks – safety and accessibility,
g) Panel surface finish / smoothness
- 15 -
13.5.2 Electrical Test:
a) 1kV Megger Test between: {phase and body > 1M}.
b) Operational est on components:
1) Controller in auto / manual mode.
c) Electrical Measurement,
1) Capacitance in µF as per drawing.
2) Insulation resistance between terminals and container.
3) AC Voltage test between terminals and container
4) Test of efficiency of discharge device.
5) Measurement of tangent of dielectric loss angle (Tan ).
6) Test for measurement of output and capacitance.
d) Insulation test for power circuit and voltage test between protective
conductor and each of 3-phases.
13.6
Test Certificates for Control Instruments:
a) The measuring / controlling instruments like ACU for measurement
accuracy {1.0class} should be tested from NABL approved
laboratory. The certification should be for the exact model number of
the instrument manufacturer.
b) Certificate should be within last 5years from date of supply.
13.6.1
The relevant test certificates shall be subject to Employer’s
approval before dispatch of the equipment. The bidder shall
furnish duly certified copies of test certificates in triplicate,
showing the results of the test.
13.6.2
After the complete delivery of Units / bank is executed, One
set of Routine/Type test cert. of all the unites pertaining to the
current Purchase order arranged serially shall be submitted in a
form of Booklet along with P.O. copy, List of unites/bank,
approved drawing copy etc. for our future ref. to planning
dept.
14.0
Drawings, Data and Manuals:
14.1
Drawings, Data and Manuals shall be submitted with the bid and in quantities
and procedures as specified in General Conditions of contract and/or
elsewhere in the specification for approval and subsequent distribution after
the issue of Letter of Intent.
14.2
Successful bidder is expected to submit 3 set of drawings for Employer’s
scrutiny and approval within 15 days from date of receipt of purchase order.
Employer shall return one set of approved drawings to successful Bidder.
Successful Bidder shall collect all sets of drawings which shall have revision
numbers prior to revision number indicated on approved drawings.
14.3
Supplier shall submit 5 sets of Approved drawing complete with Bill of
material, Operation and maintenance manual for Employer’s reference. 1 set
- 16 -
of Approved drawing complete with Bill of material, Operation and
maintenance manual in Soft Copy Format.
15.0
Guarantee
15.1
The Bidder shall guarantee that the material supplied by shall be new and in
accordance with Bid document and shall be free from defect in material and
workmanship.
15.2
The Employer’s representative shall have full power to reject any of the
materials or works, which may prove defective in manufacture, poor
workmanship or performance both before the delivery and up-to a period of
Sixty (60) months from the date of bringing the equipment’s into use, the
Bidder shall forthwith replace such rejected material or works to the
reasonable satisfaction of the Company’s representative at his own cost.
16.0
Replacement of Defective Parts and Materials
The bidder shall make good at his own expense all defects due to faulty
design, material or workmanship, which may develop under proper use
during a period of 66 months from the date on which the equipment’s are
delivered or 60 months based on AMC contract, after bringing the equipment
into commercial use whichever is earlier.
17.0
Table of Compliance:
17.1
Bidder shall indicate compliance status for every requirement and feature, on
the right hand side margin of the specification. Following symbols shall be
used for the same:
C - Compliance
A - Non compliance but a functional alternative is proposed
X - Non compliance and no functional alternative is propose
- 17 -
Fig-1
- 18 -