isactnd33-2-4
-
Upload
gunadevan-chandrasekaran -
Category
Documents
-
view
9 -
download
0
description
Transcript of isactnd33-2-4
Specifications For Copper Bus Duct
SPECIFICATIONS FOR COPPER BUSDUCT 4000A / 6000A
1. SCOPE:
This specification covers the requirements of 3 phase 415 V, 50 Hz,
4000 A / 6000 A continuous rated, copper TPN bus with enclosure
suitable for indoor / outdoor type.
The bus – duct shall be designed for the above current ratings and
for a maximum temperature rise of 400 C over an ambient temperature of
45°C.
2. The bus – bars shall be of hard drawn high conductivity electrolytic
grade copper flats of electrical grade 63401-WP as per IS: 5082.
The bus- bars shall be of uniform cross section along its entire
length. No tapering of the bus bars’ cross-section is allowed.
3. The enclosure of bus – duct shall be of 14 SWG sheet steel of
minimum thickness of 2 mm bolted on to an angle iron / structural
steel framework. The bus duct shall be painted after suitable
pretreatment of all structural steel and plates with anti-corrosive
epoxy base primer paint & two coats of anti corrosive epoxy base
paint externally with a colour of pebble / flint gray shade RAL
7032and dried in a oven. The enclosure shall conform to IP: 55
for out door and IP: 54 for indoor, as per Indian Standards.
Inner surface of the bus – duct shall be coated in the rubber paint.
4. The bare bus –bars shall be provided with a coat of Matt finish,
5. The joints in the bus –bars shall be of the bolted type and it shall be
ensured that the following precautions are observed.
1. The contact pressure must be ample and this shall be
maintained during the time the panel is in service.
ii. The surfaces of the conductors must be clean.
iii. With flat conductors, the overlap should be equal to or
greater than the width of the bars or ten times the
thickness of the bar whichever is greater.
iv. The joints shall be treated by the application of joint
compound to render the joint moisture-proof.
v. For the joints use of bolts of cadmium plated high-tension
MS bolts having expansion characteristics due to
temperature change similar to the conductor may be used
with steel nuts.
vi. Smearing the surfaces with oxide inhibiting grease just
prior to making the joint in order to preserve the efficiency
of the joints. Minimum phase and earth clearance
required shall be maintained at joints. The joints shall be
thoroughly shrouded.
6. The bus bar arrangement shall generally conform to IS: 5578 and
IS: 11353. The bus – duct shall be also supplied with suitable earth
bus running all along the length of the bus – duct made of copper
strips. Current density at any part shall not exceed prescribed limits.
Two copper flats of same phase shall be stacked together or the
spacing between them shall be maximum of the
thickness of one conductor.
7. The busbars shall be phase identified by colour, at intervals.
Colour code shall be RED, YELLOW and BLUE for phase
and BLACK for the neutral bus – bar.
8. Bus – bars shall be supported on tough, non-hygroscopic, resin
bonded self-extinguishing fire retardant insulators preferably of
SMC / DMC with ribbed construction to prevent tracking due to
dust paths. Bus – bars and supports shall withstand the maximum
stresses that are induced in the event of. The short-circuit
currents being as specified. The bus – bar support shall be at a
minimum interval of 500mm.
9. The bus – bars shall be supplied with flexible expansion joints at
both the ends and also at bends. The supports and expansion
arrangement shall be so chosen to avoid undue stress to the
bus – bars, supports and end connections.
10. Dust excluding gaskets of neoprene shall be used for enclosures to
ensure water and dust tightness. The duct shall be (mostly) suitable
for outdoor installation. Minimum two numbers of space heaters
with thermostats shall be provided to prevent moisture
condensation and maintain cubicle temperature 5 Deg.C above the
ambient.
11. The clearance between the individual bare phase power bus – bars
and between the phase and earth bus –bars in air shall be not less
than 25 mm and 19 mm respectively.
12. Drain points shall be provided at die bottom of the bus – duct, at
suitable locations. The bus –duct shall be provided with silica gel
breathers, in all sections.
* * * * *
Specifications for 11KV HT Panels
HT SWITCH GEAR (11 KV SIDE): SCOPE:
This specification covers the requirements of design, manufacture, assembly,
testing, supply, delivery and installation of 3 phase, 11 KV switch gear panel
with all accessories complete in all respects conforming to latest design and
practice and as per latest revisions of IS 3427.
GENERAL DESCRIPTION:
The HT switch board shall consist of 14 nos. of 800 A, 3 pole, 350
MVA, 11KV vacuum circuit breakers to act as following:
a. 2 Nos. - incomer circuit from each of 6.3 MVA 66 / 11 KV 50
Hz transformers having OLTC.
b. 2 Nos. - incomer circuit from 2 X 1.25 MVA, 11 KV DG Sets
each.
c. 1 No. - bus coupler.
d. 9 Nos. - outgoing feeders.
RATING AND DATA:
Sl. No. Item Particular. Rating.
1. Applicable standards. IS 13118 & EC - 56
2. Rated continuous current. Upto 800 A
3. Rated frequency. 50 Hz.
4. No Of poles. 3
5. Rated voltage. 12kV
Sl. No. Item Particular. Rating.
6 Basic Insulation level. 28kV rms / 75 kV peak.
7. Rated short time withstand
current
20 kA rms for 3 Seconds.
8. Rated short circuit current 20 kA rms.
9. Rated short circuit making
current.
50 kA Peak.
10. Operating mechanism. Motorized Spring charging
/Electrical & Manual Tripping,
Closing.
11. Continuous Bus bar rating. Upto 1000 A
12. Bus bar material. Copper.
13. Rated operating sequence. O-0.3 sec - CO - 3 min -CO
14. Control Voltage. 220 V DC.
15. Type. Vertical Isolation, Horizontal Draw
out.
APPLICABLE STANDARDS (Latest Revision):
IS 3427 / I EC - 298, 694 : Metal clad switch gear for high
Voltage applications.
IS 13118 / I EC – 56 : High voltage AC circuit breaker.
IS 2705 : Current Transformer.
IS 3156 : Voltage transformer.
IS 375 :Arrangements of breaker busbar main
connection and auxiliary wiring.
CONSTRUCTION:
The vacuum circuit breakers should be conforming to IS: 13118 and EC -
56. This breaker should be contained in an epoxy resin construction
with one interrupter per phase. The trefoil configuration is operated by an
external operating mechanism via a robust linkage. The linkage is connected
to a central lifting rod, which rises all 3 phases at once providing
simultaneous closing. The terminal conductors should carry replaceable self
aligning isolating sockets which, when in the raised position; make contact
with plugs contained in fixed spout insulator. This VCB should be designed for
motor operated spring closing with provision for manual closing mechanism.
The unit should be supplied with a wiring panel, which contains the
secondary wiring termination. For ease of access, the panel should be
fitted with a hinged door. Ample accommodation should be provided for
instruments and relays above the wiring compartments.
Cubical with breaker shall have following features:
a. The cubicle shall basically have 4 separate compartments viz.
Circuit breaker compartment, Busbar Compartment, CT and cable
termination compartment and a LT Instrument compartment. All HV
compartments must be individually tested for internal arc.
b. The switchgear shall be dust and vermin proof. All doors, panels,
removable covers shall be gaketed all around and the cubicle shall
conform to IP 54 class of protection. The IP – 54 degree of
protection shall be maintained even in the circuit breaker panel.
c. The cubicle shall be fabricated with 2.5 mm thick CRCA steel sheet
having smooth finish and leveled to give a neat and uniform
appearance.
d. The switchgear shall be painted / Powder coated with approved
shade with pre surface treatment through 7 – tank process.
e. The circuit breaker compartment shall have shutters for the spout
opening of busbar and feeder sides.
f. The circuit breaker shall have Test/Isolated and Service position
inside the cubicle and it shall be possible to close the panel door
with the circuit breaker in the test/isolated positions.
g. Positive guiding arrangement shall be made in both circuit breaker
truck and housing to ensure proper alignment.
h. All circuit breakers of the same rating shall be interchangeable.
i. The doors shall be hinged, good quality, removable type, and Non-
corrosive.
j. An earthing bus as per IER and code of practice shall be provided
at the bottom and extends throughout the length of the switchgear.
It shall be bolted to the framework of each unit and breaker
earthing contact bar.
k. The earth bus shall be copper and have sufficient cross-section to
carry the momentary short circuit and short time fault current for
three seconds as specified without exceeding maximum allowable
temperature rise.
l. All non-current carrying metal work of the switchboard shall be
effectively connected to the earth bus.
m. Positive earthing of circuit breaker frame shall be maintained when
it is in the connected position and in all other positions when the
auxiliary circuits are not totally disconnected.
n. The circuit breaker frame / carriage shall be earthed before the
main breaker contacts are plugged in the secondary contacts.
o. The earthed bus shall be accessible from the back of the panel.
CONTROL & COMMUNICATION WIRING:
a. The panel should be complete with all control wirings,
communication wiring & other accessories. All communication and
control wiring shall be done in separate cable ducts and shall be
brought in front of panel and terminated in suitable and separate
terminal blocks. The terminal block used shall be of clamp type.
b. Provision of remote closing / tripping shall be provided.
c. The control & communication circuit wiring shall be carried out with
650 V grade PVC insulated 2.5 Sqmm stranded annealed and un –
tinned electrolytic copper wire and proper colour wiring for closing
and tripping & communication shall be provided.
d. The termination of wire shall with crimping type lugs.
e. At least two Nos of space heaters, each 80 W, 230 Volts AC 50 Hz
with thermostat control shall be provided in each breaker panel.
f. Fuses and links shall be provided to enable individual circuits to be
isolated. Each of DC circuit shall be provided with one fuse on
positive and one link on the negative side.
g. Ferrules shall be provided for identification of each wire.
h. All control fuses shall be of HRC fuse type.
CABLE TERMINATIONS:
a. The switchgears shall have adequate space at the rear of the
cubical for carrying out termination of power cables using Heat
Shrinkable type termination kits suitable for at least 2 runs of 3
core, 150 / 300 sqmm, 11 KV, XLPE cable.
b. The kits, lugs and clamps shall be arranged separately.
c. Provision shall be made for entering the control & communication
cable from the front bottom of the cubical.
BUSBARS
a. The bus –bars shall be of electrical grade, suitable rating, insulated
with heat shrinkable sleeve. The bus –bar shall be of electrolytic grade Copper material as per latest IS Standard and shall be capable of carrying rated normal and short circuit current.
b. The Bus – bar shall be located in totally enclosed air insulated
compartment and segregated from all other compartments of the
cubical. The bus –bars shall have very high mechanical strength to
withstand dynamic stresses.
c. Insulating barriers shall be provided between the adjacent cubical
and the bus – bars shall pass through them. These barriers shall
have non-hygroscopic properties and shall be fire retardant.
d. All bus connections, joints and taps shall be applied with contact
grease at the making surface and insulated.
e. Bus – bars shall be rated in accordance with the service condition
and the rated continuous and short time current rating specified.
The temperature rise shall be within the limits specified in
IS – 3427 with latest revision.
f. Adequate clearance between 11 KV point and earth and between
phases shall be provided to ensure safety as per provision in
Indian electricity rules 1956 and its amendments thereof and also
in accordance with the relevant Indian standard specification. The
same shall be capable of withstanding the specified High Voltage
Test as per IS 13118 with latest amendments.
g. All bus bars shall be rigidly and firmly mounted and shall be
capable of withstanding stresses caused short circuit and
vibrations.
h. Sharp edges and bends either in bus – bar or bus bar connections
shall be avoided as for as possible. Where such bends or edges
are UN avoidable, suitable compound or any other insulation shall
be supplied to prevent local ionization and consequent flashover.
SAFETY INTERLOCKS:
Each switchgear unit should be provided with a system of mechanical
interlocks, which automatically impose a fixed sequence of events
designed to protect the equipments and the operator from the danger of mal-
operation.
Switchgear shall be provided with following interlocks.
a. Withdrawal or engagement of the circuit breaker shall not be made
possible unless it is in open position. Any attempt of the
withdrawal of closed circuit breaker shall not trip circuit breaker.
b. Operation of circuit breaker shall not be possible unless it is in
service or isolation position.
c. Breakers shall have trip free mechanism to avoid closing of
circuit breaker during fault.
d. It shall not be possible to put the circuit breaker in service
position unless the auxiliary supply plug and socket is
connected.
e. It shall not be possible to disconnect auxiliary plug and socket
when the circuit breaker is in ON condition.
f. Circuit breaker cubicle shall be provided with safety shutters
operated automatically by the movement of the circuit breaker. It
shall be possible to open the shutters intentionally for testing
purpose. The shutters or orifices shall be clearly labeled as bus –
bars and Feeders respectively.
g. The breaker shall be earthed before the main circuit breakers
controls are plugged in the stationary contacts. Positive earthing of
the circuit breaker/frame truck shall be maintained in the connected
position.
The VCB's should be coupled with each other appropriately so as to achieve
the requirements stipulated under general description heading above.
RELAYS AND INSTRUMENTATION:
The VCBs shall have protection against over current and earth fault. These
units shall be equipped with microprocessor-based relays (MIF Digital
based relay / F 60 Feeder Protection Relays). All feeders including outing to
RUPS shall be provided with feeder management relays.
Features required are:
a. Over current protection for distribution feeders.
b. 3 phase, high-set and low-set phase over current protection.
c. Sensitive non-directional high-set and low-set earth-fault
protection.
d. Four standardized inverse definite minimum time (IDMT) time-
current curves as per IEC.
e. Numerical design for stable time current curves, high
accuracy and reliable operations.
f. Fault records, event records and diagnostic data should
be read.
g. High immunity to electrical interference and robust
Aluminium case to class IP 54.
h. Complete Differential protection scheme and Buchholz Alarm
and Trip for all transformer feeders.
i. Improved system reliability supported by a built in self-
supervision system with auto diagnosis.
j. Serial communication capability for extensive exchange of
data between the protection relay and the substation control
level.
k. Powerful optional PC tool for reading, setting and recording
relay data and parameters.
l. 0 to 800 Amps Digital type Ammeter of suitable range with
selector switch.
m. Digital Voltmeter with selector switch.
n. Differential Protection for feeder and Bus coupler panels.
o. Power factor meter.
p. Kilowatt meter.
q. Buchholz rely alarm and trip arrangement with annunciation
All relays should be self-diagnostic.
CURRENT TRANSFORMERS (CTs):
The CTs shall be of the bar primary, epoxy resin cast type with necessary
burden and ratios. The CTs shall be housed in the cable terminal
compartment. The CTs shall have class E insulation and shall have STR of
minimum 3 Seconds. CT shall have burden of 30 VA and ratio of 800 / 5
Amps. Two core CT shall be provided for each breaker Core used for
metering shall have accuracy class of 1.0 and core used for protection shall
have accuracy class of 5P10. Test certificate shall be furnished. Both
terminals of each of the CTs shall be brought to the LT chamber.
For incoming breakers and transformer feeders, necessary CTs of
suitable class for differential / REF to be provided including interconnections
and testing after commissioning.
POTENTIAL TRANSFORMERS (PTs):
The PTs shall be of the epoxy resin cast type with burden of 100 VA and
11000 V / 110 V ratio with Class 1 accuracy for metering and protection. The
PTs shall have class E insulation. The PTs shall be provided on the
incoming side and the PT shall be mounted independently draw out type.
The PTs shall be provided with HRC fuse protection on HT side and fuse on
secondary side. The entire PT secondary terminals shall be individually wired
upto the LT chamber.
SURGE ARRESTORS:
Necessary Surge arrestors of suitable type and rating in suitable
enclosure for arresting the restriking voltage shall be supplied and installed
with all outgoing breakers including outgoing breakers to RUPS.
DOCUMENTATION:
The following documentation shall be furnished (3 copies): General
arrangement drawing with foundation plan, schematic wiring diagram, test
certificates for CBs, CTs, PTs and meters & relays, operation and
maintenance instruction manual and type test certificates for CBs.
TESTS AND INSPECTION:
The switchgear shall be tested in accordance with the standard specified and
shall be conducted in the presence of ISRO's representative. These tests
shall include the following:
a) Operation and continuity tests.
b) Mill volt drops tests of circuit breaker contacts.
c) Megger test with 5KV megger.
d) Power frequency high voltages withstand test.
In addition to the above, secondary injection tests should be conducted on
all over current / earth fault relays in the presence of the client.
The bidder shall submit all type test report with the bid to prove the capability
and suitability of his offer.
SPECIAL TOOLS / OPERATING HANDLE:
a) One set of special tools required for routine maintenance
should be supplied.
b) One operating handle should be supplied with each
switchboard.
INSTALLATION:
The HT switchgear should be installed using necessary foundation bolts, nuts
etc., and other hardware after removing the existing panels. These units
should be suitably aligned and coupled. The same should be tested
and commissioned in all respects as per standard practice. A copper earth
bus of suitable size shall run continuously at the bottom of panel. Earth shall
be robust and shall be capable of carrying full short circuit current for 1
second. Doors, covers and all non-current carrying metallic parts shall be
earthed through flexible copper wires. Metal to metal joints anywhere in the
cubical shall be gasketted by cross-linked polyutherence gaskets for zero
gaps. Mechanical interlock facility shall be provided as a optional item. Two
EB incomers and two DG incomers shall be mechanically and electrically
interlocked in such a way that only one incomer to bus and bus coupler shall
be on at a time.
NOTES:
1. Insulating Rubber mats of appropriate voltage grade and
conforming to relevant standard with latest revision must be
laid throughout the length of the panel on front side for safety
of operators.
2. Panels are required to be installed on existing trenches.
However the party shall carry out any modification including
civil works required for installing panels in existing trenches.
MAKES: ABB, ALSTOM, SIEMENS, Crompton greave. Schneider.
--o-0-o--
Specifications for 3.15 MVA
Transformer
TRANSFORMER – 3150 KVA. 1.0 SCOPE:
This section covers the design, manufacture, assembly,
testing at manufacturer’s site, supply, transportation, storing,
installation and commissioning of the power transformer, as
detailed in the schedule of requirement complete with all
accessories required for efficient and trouble free operation as
required. 2.0 RATING & DATA:
2.1 Continuous Output 3150 KVA
2.2 No load voltage ratio 11000 V / 433 V
2.3 No. Of phases 3
2.4 Frequency 50 Hz ± 5%
2.5 Duty Continuous
2.6 Power Factor of load 0.85 (appx.)
2.7 Vector group reference Dyn 11
2.8 Autotransformer / double wound Double
2.9 Winding material Copper
2.10 Primary connection Delta
2.11 Secondary connection Star
2.12 Insulation class
2.12.1 Solids
2.12.2 Oil
Class A as per IS 1271
As per IS 335
2.13 Type of cooling ONAN
2.14 Rated power with natural cooling 3150 KVA
2.15 Installation Outdoor
2.16 Electrically exposed / non exposed Non exposed
2.17 Insulation level – HV winding
Power frequency withstand voltage
Lightning impulse withstand voltage
28 KV r m s
75 KV peak
2.18 Terminal details
18.1 HV side
18.2 LV side
Suitable for cable end
joints
Copper bus duct of outdoor
installation
2.19 Star point
19.1 HV winding
19.2 LV winding
–
Yes With brought out
neutral suitable for copper
flat termination.
2.20 Voltage tapping on HV side 0,+/- 2 ½ %, +/- 5%, +/-
7.5%
2.21 Tap changing
21.1 Off load / on load
21.2 Manual / Automatic
Off load
Manual
2.22 Parallel Operation Yes
2.23 Painting As per 13ES900 / 94 with
epoxy based painting
* Note: Relevant drawings and technical particulars to be
submitted with the offer.
3.0 FITTINGS & ACCESSORIES:
The transformer should be provided with all accessories like
Drain valve with plug, filter valve, two earthing terminals,
Thermometer pocket, Magnetic type Oil level indicator, lifting lugs,
anodized and engraved rating plate and terminal marking plate, Oil
conservator, de-hydrating breather with silica gel, Air release plug,
oil filling hole and cap, jacking lugs, explosion vent, dial type
thermometer, Off load tap changing switch, Bi-directional rollers,
Buchholz relay with contacts for tripping and annunciation,
pressure release valve, winding temperature indication with
tripping and alarm facilities. Complete control wiring for visual and
audible alarm along with weather proof marshalling box shall be
provided. Secondary side of transformer should be suitable for
copper bus duct termination and brought out neutral terminal
suitable for copper strips for grounding.
4.0 DESCRIPTION AND BASIC REQUIREMENT:
The detailed description and basic requirements of the
transformers are given in this specification.
Transformer required, is intended for use in substation in
ISAC Centre; as such reliability of performance and safety of
operation is of prime importance. Only designs well proved in long
service and well known for high efficiency and reliable
performance, good voltage regulation, characteristics and low
operational and maintenance costs shall be considered. 4.1 Design Features:
The transformer shall be properly designed and effectively
cooled to ensure its working under full load conditions continuously
under short time over load conditions.
Adequate safety devices shall be incorporated to prevent
damage to transformer winding or tank due to over heating or
system electrical disturbances.
The transformer shall be designed to meet guaranteed
impulse levels as per IS 2026.
5.0 STANDARDS:
Except where modified by this specifications the
transformers shall comply the requirements of latest revision of IS:
2026.
6.0 RATING:
The transformers shall have a minimum continuous rating
(as defined in IS: 2026) at the secondary terminals at specified
output at specified normal pressures ratio, frequency, altitude and
temperature rise. 7.0 TYPE:
Unless specified or otherwise herein or in the order, the
transformer shall be of double wound, 3 phase oil immersed
naturally cooled, suitable for outdoor installation and suitable for
operation in prevailing climatic conditions at Bangalore.
8.0 TYPE OF LOAD:
The transformers are intended to be used for supplying
linear, non linear, power and lighting and Rotary UPS load of ISAC
Centre continuously.
9.0 TEMPERATURE RISE:
Maximum temperature rise at the specified maximum
continuous output, pressure, ratio and frequency, shall not exceed
the limit specified in IS: 2026.
10.0 OIL:
The insulating oil used in the transformer shall comply with
the requirements specified in IS 335 specifications for insulating oil
for transformer and switchgear. The transformers shall be
supplied with necessary oil for first filling including 10 % additional
quantity.
11.0 TANK:
The tank shall be built in such a manner so as to withstand
electrical, mechanical and thermal stresses, which are likely to be
set up when the transformer is put in normal service as well as
short circuit conditions.
The transformer tank shall be built of electrically welded steel
plate of suitable thickness without any scaling. All joints of the
transformer tank and fittings shall be oil tight and no bulging shall
occur during services.
The interior surface of tank shall be coated with insulating
paint and the external surfaces shall be suitably painted with
enamel paint and has to with stand the adverse external
atmospheric conditions.
12.0 FITTINGS:
Standard fittings as per specific technical requirements shall
be provided on each transformer. The relative positions of fittings
shall be in accordance with IS 2026.
13.0 CONNECTIONS AND VECTOR GROUPS:
Suitable for Cables on HT side and bus duct on LT side shall
connect the transformer windings respectively. The vector group
shall be Dyn 11.
14.0 TERMINAL LEAD AND MARKING:
All leads including tapings shall be insulated and rigidly
supported and shall be easily accessible without the need for
removing the winding from the tank. The physical positions of
terminals relating to one another shall be as per IS 2026.
15.0 TAPPINGS AND TAP CHANGING SWITCHES:
The tapping for voltage adjustment shall be provided on the
high voltage (primary) winding of the transformers. All tapings
terminals shall be brought out to terminal board. The tapping on
the transformers should conform to IS: 2026. The transformers
shall be provided with triple pole hand operated tap changing
switch suitable for external operation on OFF LOAD without
removing tank covers or lowering oil level.
The spindle of the switch-operating handle shall pass
through oil tight stuffing gland on the side of the tank. The tripping
switch shall be of gang operated type enabling tapping on all the
three phases to be changed simultaneously.
All engraved number plates shall be provided for each switch
with a movable pointer to clearly show the voltage for which the
tapings on each phase are connected. Provisions shall be made
so that the switch can be locked and at any one of the correct
positions. The whole arrangement shall be absolutely rigid and
absolutely insulated throughout. Separate locks and keys shall
also be provided to the tap – changing switches in order to prevent
unauthorized tap changing.
Under the conditions of short circuit, tap changing equipment
should be capable of carrying the same current as the winding.
16.0 EFFICIENCY:
The transformers shall be so designed that the maximum
efficiency occurs above 70 % of the full load capacity. The core
losses shall be kept low for transformer to obtain high efficiency
and shall be indicated in the quote.
17.0 REGULATION:
The inherent regulation at normal balanced load at unity and
0.85, 0.9 and 0.95 power factors at a temperature of 75oC shall be
stated in the tender and tenderer shall guarantee the performance
to meet the figures. The reactance of the transformer shall be as
low as possible and in accordance with IS 2026.
18.0 FLUCTUATION IN VOLTAGE AND FREQUENCY:
The transformer shall be subject to variation of voltage up to
±12½ % on the primary side and frequency ± 5% during routine
operations.
19.0 TRANSFORMERS AS UNIT:
The transformers shall be supplied complete with all fittings
and accessories etc; which are normally considered part of
transformer as a unit and are necessary for its efficient operation,
regardless of whether all the items have specifically mentioned in
the tender / enquiry / order or not. 20.0 TRANSFORMER TESTS:
Transformer shall be subjected to following routine and
supplementary tests at the manufacturers works as per IS 2026
and Departmental representative will witness the tests on the
transformer. Successful tenderer shall make all arrangements for
witnessing the test by the representatives of the Department.
20.1 Measurement of winding resistance.
20.2 Ratio, polarity and phase relationship.
20.3 Impedance Voltage.
20.4 Load losses.
20.5 No load losses and No load currents.
20.6 Insulation resistance test.
20.7 Induced over voltage withstand test.
20.8 Separate source voltage withstand test.
20.9 Zero phase sequence impedance measurement.
20.10 Power frequency high voltage test.
20.11 Temperature rise test.
20.12 Dielectric test on oil.
Test Certificates shall be given for all type tests, actual
measurements in tabular farm and also for derived values of
losses, impedance voltage, and regulation for stated loading
condition. Copies of all test results, inspection and guarantee
certificates shall be furnished in duplicate to the Department for
approval.
The insulation resistance of the HV & LV windings shall be
measured by a megger of specified voltage and duly calibrated.
The value of insulation resistance shall be in accordance with the
specifications and IS 2026.
21.0 DRAWINGS:
The manufacturer shall supply all technical literature and
drawings considered necessary for the installations operation and
maintenance of the transformer and its fittings.
These shall essentially include:
21.1 Detailed foundation drawings.
Drawings showing overall dimensions of the
transformer.
21.2 Drawings showing position of fittings.
21.3 Winding diagram and terminal markings.
21.4 List of parts with reference number.
21.5 Instruction for the installation and commissioning of
transformer.
21.6 Any other relevant data, which would be assistance for
efficient operation, maintenance and repair of fittings
and accessories.
21.7 Manual of instructions for the operation & maintenance of
fittings. In hard and soft copies.
22.0 TECHNICAL AND GUARANTEED PARTICULARS:
The tenderer shall furnish all guaranteed technical particulars
as called for in schedule particulars, which are subject to
guarantee, shall be clearly marked. Tenders lacking information in
this respect may not be considered.
23.0 PROTECTION:
The following protection shall be provided for the
transformers Detecting or actuating devices required, which form
part of the transformer construction shall be incorporated.
23.1 Buchholz alarm and trip.
23.2 Thermal alarm and trip (winding temp. & oil
temp.)
23.3 Low oil level alarms for the conservators.
In addition to above differential protection scheme and
restricted earth fault protection scheme shall be provided and
interconnected with breaker for tripping and annunciation.
24.0 INSTRUCTION MANUALS:
Three (3) copies of operation, maintenance and erection
shall be supplied one month prior to the dispatch of the
transformer. The manuals shall be bound volumes and shall
contain all the drawings as per section 21.0 and information
required for erection, operation and maintenance of the
transformer. The manual shall include the following particulars.
amongst others.
24.1 Marked erection paints identifying the
component parts of the transformers as
dispatched, with the assembly drawings.
24.2 Detailed dimensions, assembly and
description of all the components and
catalogues for operation of the transformer
and accessories.
24.2 List of spare parts.
25.0 DEVIATIONS FROM THE SPECIFICATION:
All deviations from this specification shall be separately
listed in schedule in the absence of which, it will be presumed that
the provisions of the specification are complied with the purchaser.
26.0 ERECTION & COMMISSIONING:
Immediately on arrival, the transformers shall be carefully
examined for any damage, during transit, paying particular
attention to bushing and cooling tubes, etc; The presence of rust,
condensation any where within the tank the pink color of silica gel
breathers provided with transformers filled with dry air or a
considerable drop in the pressure of nitrogen or other inert gas
filled in transformers suggests absorption of moisture by the
transformer windings. In such cases, the transformer shall be
dried out before being commissioned. The transformer shall be
filled with oil as soon as possible after satisfactory inspection and
set up in their permanent locations even though not expected to be
energized for some time. Before moving the transformer, the bi-
directional rollers shall be fixed in the required direction. The
transformer may then be moved to its permanent position. Care
shall be taken when using any levers etc; that they do not touch
the tank or cooling tubes and only the skids or rollers shall be used
for this purpose. Transformers shall be lifted by lugs provided for
the purpose and simultaneously use shall be made of all lugs to
avoid any imbalance and it shall be ensured that all cover bolts are
tightened. Where it is necessary to use jacks for lifting, the
projections / lugs provided for the purpose of jacking shall be used.
Jacks shall never be placed under valve or cooling tubes. In
certain circumstances, jacks may be placed under stiffening curbs
on the tank base. Care shall be taken that spanners or other tools
used in connection with work are not dropped into or left inside the
tank. The transformer shall be placed on suitable roles or tracks
on level concrete plinth with bearing plates of sufficient size and
strength where the transformer is in the final position; the wheels
shall be locked to prevent accidental movement of the transformer.
After positioning of transformer all electrical power and
control connections shall be done in approved manner.
The transformer should be installed on suitable pedestal and
foundation. The scope of this civil work is included in this item of
the work. Contractor should provide all the hardware that is
necessary for erection. The drawings, layout, etc; should be got
approved by Department. The power transformer shall be installed,
tested, commissioned and integrated the same with the substation
network in all respects.
After the transformer has been installed at the place of
operation and before connecting it to supply the transformer tank
shall be earthed by two separate and distinct connections through
two separate lines and the two earthing terminals provided on the
transformer. Gas or water pipes shall not be used for such
connections.
All connections of the earthing system shall be visible for
periodical inspection.
Copper strip as specified shall be used for earthing to the
earth pit. The transformer neutral point shall be brought out and
solidly earthed by copper strip of suitable size. (GI, copper strips
and required earth stations to be provided by the tenderer).
For connection of transformer neutral point with LV neutral
bus bar the current carrying capacity of conductor shall be same
as the conductors used for solid earthing of neutral.
Following tests shall be conducted on the transformer prior to
its commissioning.
1. Insulation resistance of the winding between phases and
between individual phases and earth on both HV and LV
sides and also between HV and LV windings.
2. Winding resistance. 3. Dielectric strength of transformer oil.
4. Voltage ratio test at all tap positions.
5. Polarity test.
6. Operation of Buchholz relay.
7. Proper functioning of all protective relays.
After commissioning of the transformer the LV side voltage
shall be measured at different tap positions. The transformer shall
be kept on no load for 24 hours, and shall be ascertained that
there is no undue temperature rise before loading the transformer.
27.0 GENERAL:
The work shall be carried out according to general
specification mentioned and the detailed specifications and also
according to any other instructions issued by the Department. No
claim on account of the ignorance of specifications shall be
entertained. In their own interest, the tenderers are advised to
submit their offers after a tharough study of the requirements of the
specifications and site conditions.
27.1 Guarantee Period.
Transformer, its fittings and accessories shall be guaranteed
for trouble free operation for a period of Twelve Months from the
date of commissioning. Any problem related to transformer within
guarantee period shall be attended immediately at free of cost.
The supplier has to furnish performance bank guarantee for 10 %
of the order value.
27.2 Experience, Organization and facilities
Tenderer shall possess sufficient experience, necessary
organization and facilities to ensure successful and timely design
and manufacture of unit of the size and type called for under these
specifications. A schedule giving a list of transformers
manufactured, which are comparable in size, rating and
performance standard, the name of purchaser and dates of
installation shall be furnished along with the tender. The tenderer
shall have an organization, which provides effective independent
checks at all stages of manufacture. The organization shall have
experienced personal to design and thoroughly test and inspect
the equipment during all stages of manufacture and assembly.
Complete and adequate testing facilities shall be available
for performing all required and specified tests. Offers from
manufacturers who are having at least five years of experience in
manufacturing of similar capacity of transformers only will be
considered. Manufacturer shall be an ISO certified firm. Copies of
all supporting documents shall be furnished.
--o-0-o--
Specifications for 1.1 KV LT XLPE
Cables
SPECIFICATIONS FOR 1.1 KV XLPE ( CROSS - LINKED POLYETHYLENE
) INSULATED POWER CABLES
1. SCOPE:
This specification covers design; manufacture, testing,
packing, supply and delivery of 1.1 KV, 2C / 3C / 3 ½ C/ 4 C XLPE
insulated power cables from 2.5 sqmm to 400 sq mm size, PVC
Sheathed cables for electric supply as per IS 7098 Part 1 with latest
revisions.
2. Materials:
2.1 Conductor.
The conductor shall be composed of Copper / aluminium wires
complying with IS 8130 with latest amendments.
2.2 Insulation.
The insulation shall be of cross linked Polyethylene conforming to
requirements given in IS 7098 Part 1 with latest revisions.
2.3 Filer and Inner sheath.
The fillers and inner sheath shall be of the following
a. Vulcanized or un Vulcanized rubber or
b. Thermoplastic materials.
Vulcanized or un Vulcanized rubber or Thermoplastic materials
used for inner sheath shall not be harder than XLPE and PVC
used for insulation and outer sheath respectively. Fillers and
inner sheath materials shall be so chosen as to be compactable
with the temperature rating of the cable and shall have no
deleterious effect on any other component of the cable.
2.4 Armoring.
Armoring shall be of Galvanized round steel wire or galvanized
steel strips.
2.5 Outer sheath.
The outer sheath shall be of PVC compound conforming to
requirements of type ST 2 compound of IS 5831 (With latest
revisions)
3. Construction:
3.1 Conductor.
The construction of the conductor shall be of solid conductor upto
10 sq mm and stranded for conductors sizes above 10 sqmm.
A protective barrier may be applied between the conductor and
insulations. Such barriers when used shall be compatible with
insulating materials and suitable for the operating temperature of
the cable.
3.2 Insulation.
The conductor (with protective barrier, wherever applied) shall be
provided with cross-linked polyethylene insulation applied by
extrusion.
The average thickness of insulation shall not be less than the
nominal value as specified in IS 7098 Part 1 with latest revisions.
The insulation shall be so applied that it fits closely on conductor
(or barrier if any) and it shall be possible to remove it without
damaging the conductor.
Core Identification:
Cores shall be identified as specified below.
a. Coloured strip applied on the core. Red, yellow and blue colours
shall be used to identify the Phase conductor and black to identify
reduced neutral conductor or
b. Colouring of XLPE insulation as follows
1 Core: Red, black, yellow, blue or natural.
2 Core: Red and black
3 Core: Red, yellow and Blue
4 Core: Red, Yellow, blue and black.
For reduced neural conductor black colour shall be used.
5. Laying up of cores:
In twin, three and multi core cables, the core shall be laid
together with a suitable lay, outermost layers shall have right
hand lay and the successive layer shall be laid with opposite
lay. Where necessary, the interstices shall be filled with non-
hygroscopic material.
6. Inner sheath (Common covering):
The laid up cores shall be provided with an inner sheath applied
either by extrusion or by rapping. It shall be ensured that it 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 given in IS 7098 Part 1
with latest revisions.
7. Armoring:
Armoring shall be applied over the inner sheath in case of twin,
three and multi core cables.
The armor wire/strips shall be applied as closely as practicable.
The direction of lay of the armor shall be left hand. For double
wire/strip-armored cables this requirement shall apply to the inner
layers of wires/strips. The outer layer shall, except in special
cases, be applied in reverse direction to the inner layer, and there
shall be a separator of suitable non hygroscopic material such as
plastic tape, bituminous cotton tape, rubber tape or proofed tape
between the inner and other layers of Armour wires/strips.
A binder tape may be provided on the Armour.
7.1 Type of armor.
Where the calculated diameter below armoring does not exceeds
13 mm, the armor shall consist of galvanized wires above 13 mm it
shall be steel wires or galvanized steel strips.
7.2 Dimensions.
The dimensions of galvanized steel wires or strips shall be as
specified in IS 7098 Part 1 with latest revisions.
7.3 Joints.
The joints in armor wires or strips shall be made by brazing or
welding and the surface irregularities shall be removed. A joint in
any wire/ strip shall be at least 300 mm from the nearest joint. In
any other armor / wires / strips in the completed cables.
7.4 Resistance.
The DC resistance of the galvanized steel wire/strip armor shall
comply with the appropriate values as per IS 7098 Part 1 with
latest revisions. When corrected to 20 degree centigrade.
8. Outer Sheath:
The outer sheath shall be applied by extrusion over the armor. The
colour for the outer sheath shall be black for all cables intended for
extension of existing cable. Whereas for a full-length cable, colour
of outer sheath shall be as directed by Engineer – In – Charge.
8.1 Thickness of outer Sheath.
The minimum thickness of PVC outer sheath of armored cable
shall not fall below the nominal value as per IS 7098 Part 1 with
latest revisions
9. Tests:
9.1 Type Test.
All type tests shall be in accordance with latest revisions of
following standards.
1. IS 8130
2. IS 10810
3. IS 3975
4. IS 5831
Test certificates of following type tests shall be furnished with
theoffer.
Test for conductors.
a. Annealing test (For copper).
b. Tensile test (For Aluminum).
c. Wrapping test (For Aluminum).
d. Resistance test.
e. Test of armoring / strips
Test for insulation and sheath.
Physical Test for insulation.
a. Tensile strength and elongation at break.
b. Aging in air oven.
c. Hot set test.
d. Shrinkage test.
e. Water absorption test. (Gravimetric).
Physical test for outer sheath.
a. Tensile strength and elongation at break.
b. Aging in air oven.
c. Loss of mass in air oven.
d. Shrinkage test.
e. Hot deformation.
f. Heat shock test.
g. Thermal stability.
Insulation Resistance (Volume resistively test).
High voltage test.
Flammability test
9.2 Acceptance test.
The following shall constitute Acceptance test.
f. Annealing test (For copper).
g. Tensile test (For Aluminum).
h. Wrapping test (For Aluminum).
i. Conductor Resistance tests.
j. Test for thickness of insulation and sheath.
k. Hot set test for insulation.
l. Tensile strength and elongation at break for insulation
and sheath.
m. High voltage Test and insulation (Volume resistively)
n. Cold bend test for outer sheath.
o. Cold impact test for outer sheath.
p. Resistance test for armor.
Sampling plan for acceptance test shall be as per IS 7098 Part 1
with latest revisions
9.3 Routine test.
The following shall constitute the routine test.
a. Conductor resistance test.
b. High voltage test.
10 Identification:
10.1 Manufacturer identification.
The manufacturer shall be identified throughout the length of the
cables by means of a tape bearing the manufacturer name or
trademark or by manufacturer name or trademark being indented,
printed or embossed on the cable. Printing embossing, or
indentation shall be done only on outer sheath.
10.2 Cable identification.
The word ELECTRIC shall be Printed embossed, or indented
throughout the length of the cable on outer sheath only.
10.3 Cable code.
The following code shall be used for designating the cable.
Aluminium conductor A
XLPE insulation 2 X
Steel round wire amour W
Steel strip Armour F
Double steel strip Armour FF
Double steel round wire
Armour
WW
PVC Outer Sheath Y
11. Packing and Marking:
The cable shall be wound on a drum as per IS 10418 with latest
amendments and packed. The ends of the cable shall be sealed by
means of non-hygroscopic material. The cable shall carry the
following information either stenciled on the drum or contained in a
label attached to it.
a. Reference to the IS Standard
b. Manufacturer name or trademark.
c. Type of cable and voltage grade.
d. Numbers of cores.
e. Nominal cross sectional area of the conductor.
f. Cable code.
g. Length of cable on the drum.
h. Number of length on the drums.
i. Direction of rotation of drums.
j. Gross mass.
k. Country of manufacture and year of manufacture.
The cable (drum or label) may also be marked with the standard
mark.
^^^^^^^^^
Specification for
11KV XLPE Cables
SPECIFICATIONS FOR 11 KV XLPE (CROSS LINKED POLY-ETHYLENE)
INSULATED POWER CABLES
SCOPE:
This specification covers design, manufacture, testing, packing, supply and
delivery of 11 KV XLPE insulated power cables for use with effectively earthed
distribution systems and laying as per standard practice.
STANDARDS:
Unless otherwise specified, the cables shall conform in all respects to IEC
- 502 / 1935 / IEC - 840 /I983 and also conforming to IS : 7098 (part-III) / 1993 with
latest amendment or latest version "Cross linked polyethylene insulated PVC sheathed
cables for working voltage of 11KV". Cables meeting any other standards, which
ensures an equal or better quality than the standards mentioned above will also be
acceptable. In such a case, a copy of the standard followed should be enclosed along
with the tender.
CLIMATIC CONDITIONS:
The climatic conditions under which the equipment / item shall
operate satisfactorily are as follows:
a) Maximum ambient temperature of air in shade : 500 C
b) Minimum ambient temperature of air in shade : 40 C
c) Maximum daily average ambient temperature : 400 C
d) Maximum yearly average ambient temperature : 300 C
e) Maximum relative humidity : 95 %
f) Average number of the thunder storm days per annum : 15
g) Average annual rainfall : 150cm.
h) Maximum wind pressure : 150 kg / m2
i) Altitudes not exceeding above MSL : 1000 M
j) Max. Soil temperature at cable depth : 30° C
PRINCIPAL PARAMETERS:
11KV Grade XLPE single core power cable with H.D. aluminium
conductor shielded with extruded semi-conducting layer insulated
with dry and cured cross-linked polyethylene (XLPE) insulation,
insulation screened with extruded semi-conducting layer, insulated
core copper-wire screened lapped with a combination of semi
conducting water swellable and poly aluminium laminated
followed by black extruded PE (poly-ethylene) inner sheath, single
H.D. aluminium wire armored and graphite coating PVC outer
sheathed cable, overall conforming to IEC-502 (1983) for
construction and IEC-840/1985 for tests and also conforming to IS
: 7098 (part-Ill) / 1993 or any latest amendments thereof.
Outer sheathing shall be designed to afford high degree of
mechanical protection and should also be heat, oil chemicals and
weather resistant. Common acid, alkalis and saline solution
should not have adverse effect on the PVC sheathing material
used.
The cable should be suitable for lying in covered trenches and / or
buried under ground in outdoor.
CABLE PARAMETERS: 11 KV
1 Voltage grade (U) 11KV 2 No. Of cores Three 3 Size in mm2 150
4 Nominal system voltage 11KV 5 Highest system voltage 11 KV + 10% 6 System frequency 50 Hz. 7 Variation in frequency +/- 3% 8 Fault level individually for
conductor, Cu screen, Armour
20 KA for 1 Sec
9 Maximum allowable temperature
for design continuous operation
at rated full load current, the
temperature of conductor shall
not exceed
90 Degrees
centigrade
10 Maximum allowable temperature
after a short circuit for 1 Sec
shall not exceed
250 Degrees
Centigrade
11 Basic insulation level
(1.2 / 50 micro second wave)
325KVp
12 Min. power frequencies
withstand voltage.
140 KV (rms.)
13 System earthing Effectively earthed
GENERAL TECHNICAL REQUIREMENTS:
CONDUCTORS:
The cable conductor shall be made from stranded H.D. Aluminium to
form compact shaped conductor having resistance within limits specified in
IS: 8130 / 1984 for any amendment thereof. The conductor shall conform to
IEC: 228 and the shape shall be compacted circular stranded.
CONDUCTOR SHIELD:
The conductor having a semi-conducting screen shall ensure
perfectly smooth profile and avoid stress concentration. The conductor
screen shall be extruded in the same operation as the insulation; the semi-
conducting polymer shall be cross-linked.
INSULATION:
The XLPE insulation should be suitably specified 11KV system
voltage. The manufacturing process shall ensure that insulations shall be
free from voids. The insulation shall withstand mechanical and thermal
stresses under steady state and transient operating conditions. The
extrusion method should give very smooth interface between semi-
conducting screen and insulation. The insulation of the cable shall be of
high standard quality conforming to 1EC-502 / IS: 7098 (part-II) / 1988.
INSULATION SHIELD:
To confine electrical field to the insulation, non-magnetic semi
conducting shield shall be put over the insulation. The insulation shield shall
be extruded in the same operation as the conductor shield and the
insulation by suitable extrusion process. The XLPE insulation shield should
be of bonded type with metallic screening provided. Metallic screen shall be
of copper wire having fault current capacity same as the conductor (20KA
for 1-sec.).
INNER-SHEATH:
A combination of semi-conducting water swell able and poly
Aluminium laminated tape shall be followed by the inner-sheath.
The sheath shall be suitable to withstand the site conditions and the
desired temperature. It should be of adequate thickness, consistent quality
and free from all defects. The PVC sheath shall be extruded and have black
PE (Poly-ethylene).
ARMOUR:
Single H.D. Aluminium wire armoring shall be provided. The
dimension of H.D. Aluminium wire armoring shall be as per latest IS: 3975 /
1988. The Armour shall be having fault current capacity same as
conductor (20KA for I-sec.)
OUTER SHEATH:
Extruded graphite coated PVC outer sheath conforming to IEC: 502 /
1983, shall be applied over armoring with suitable additives to prevent attack
by rodents and termites.
CONSTRUCTION:
The cable shall have suitable PVC fillers laid up with insulation
cores to provide substantially circular cross section before the
inner sheath is applied. The fillers should be suitable for the operating
temperature of the cable and compatible with the insulating material.
All materials used in the manufacture of cable shall be new.
Unused and of finest quality. All materials should comply with
the applicable provision of the tests of the specification. IS, IEC, Indian
Electricity Rules. Indian Electricity Act and any other
applicable statutory provisions rules and regulations.
CURRENT RATING:
The cables will have current ratings and de-rating factors as per
relevant standard in IEC.
1. The one-second short circuit current rating values shall be
furnished and shall be subject to the purchaser's approval.
2. The current ratings shall be based on maximum conductor
temperature of 90 degree Centigrade with ambient site condition
specified for continuous operation at the rated current.
TESTS:
TYPE TESTS:
All the equipments items offered shall be fully type tested as per the
relevant standards. In case the equipment of the type and design offered
has already been type tested in Govt recognized laboratory, the tenderer
shall furnish three sets of type test reports along with the offer. These tests
must have been conducted within last five years. ISRO reserves the
right to demand repetition of some or all the type tests in the presence of
ISRO’S representative. For this purpose, the tenderer may quote unit rates
for carrying out each type test. These prices shall be taken into consideration
for evaluation. For any change in the design / type already type tested and
the design / type offered against this specification, the ISRO reserves the right
to demand, repetition of tests without any extra cost. In case the equipments
have not been type tested earlier, all the type tests as per relevant standards
shall be carried out by the successful tenderer in the presence of ISRO’S
representative without any extra cost.
ACCEPTANCE AND ROUTINE TESTS:
The supplier shall carry out all acceptance and routine tests as
stipulated in the relevant standards. Sample shall be selected from
offered lot, for not less than 10% (ten percent) of cable drums for
conducting acceptance tests.
Immediately after finalization of the programme of type /
acceptance / routine testing, the supplier shall give fifteen days advance
intimation to the purchaser, to enable him to depute his representative for
witnessing the tests.
INSPECTION:
The inspection may be carried out by the ISRO at any stage of
manufacture. The successful tenderer shall grant free access to the
purchaser's representative at a reasonable time when the work is in
progress. Inspection and acceptance of any equipments / items
under this specification by die purchaser, shall not relieve the
supplier of his collation of furnishing equipments in accordance
with the specification and shall not prevent subsequent rejection, if
the equipments / items is found to be defective.
The supplier shall keep the purchaser informed in advance, about
the manufacturing programme, so that arrangement can be made
for inspection.
The purchaser reserves the right to insist for witnessing the
acceptance / routine testing of the brought out items.
DOCUMENTATION:
LIST OF DRAWINGS AND DOCUMENTS:
The tenderer shall furnish four sets of following drawings along with his
offer. The offer without documents shall be considered incomplete.
1. General outline and assembly drawings of the item.
2. Section views showing
3. General constructional features.
4. The sectional view shall show the materials / conductor / conductor
screen / XLPE insulation / water swellable tape / HD Aluminium
armoring / PVC sheath etc.
5. Literatures, pamphlets for the offered items.
6. Unpriced schedule of price bid (without price).
NOTE : THE VENDOR SHOULD TAKE THE MEASUREMENT OF EACH
LENGTH OF THE CABLE AND THE PROCUREMENT SHOULD BE
EFFECTED TO THE ACTUAL LENGTH REQUIRED AT THE SITE WITHOUT
CALLING FOR PROVIDING STRAIGHT THROUGH JOINTS.
LAYING OF POWER CABLES:
The 11KV XLPE power cable shall be installed underground and
normally buried directly in the ground compiling with all
applicable standards. The sealing of the power cable during
execution of the work shall be in the scope of the work.
The cables shall be completely surrounded by a layer of sand
having a low thermal resistively (selected sand) about 250mm over
and below of the cable surface throughout the width of the cable
trench. Where road crossing comes in the way of laying power cables, the
power cable shall be laid through NP-4 RCC Hume pipes. The
RCC hume pipe diameter shall not be less than 400mm and shall
be filled with selected sand after installation of the cable in the
cable trench.
The extra protection of the pre-cast flat RCC slab with proportion
1 : 2 : 4 having size 600 (L) x 500 (B) x 50 (H) mm shall be
provided about 250mm over the power cables for complete route
of the cable. The RCC slab shall be with proportion not less than
1 : 2 : 4 (M-150) and also shall have steel reinforced of 6 / 8mm
dia. steel bar (4 Nos. of 300 mm side and 5 Nos. of 600 side) at
the required distance.
Normally the back filling shall consist of the materials earlier
excavated, however, bigger stones or pieces of rocks should be
removed.
The cable drum must be handled correctly and with care during
transport and laying of the power cables, in order to avoid damage
to the cables.
TECHNICAL AND GUARANTEED PARTICULARS:
The tenderer shall furnish all guaranteed technical particulars as
called for in this specification. Particulars, which are subject to guarantee,
shall be clearly marked.
COMMISSIONING:
The vendor should perform all pre-commissioning tests before the
cable is energized. This should have the concurrence of ISRO Engineers.
The vendor should furnish the detailed scheme of pre-commissioning tests.
=======
Specifications for Cable Works
SPECIFICATIONS FOR LAYING OF CABLES. 1. Scope: This specification is intended to cover the requirements of installation and
energizing of PVC/XLPE/PILCDSTA power cables including jointing of cables.
2. Standard: The power cables and its fixing accessories shall comply with the latest
relevant Indian standard and National Electrical code.
3. Laying of Cables:
3.1 General:
3.1.1: Before the commencement of cable laying, Engineer – In – Charge has
to be convinced that only ISI marked cables are used. It shall be the
responsibility of the contractor to check the soundness and correctness of the
size of the cable while taking delivery of the cable from supplier in case of
supply item. Any defects noticed after and before laying of cables shall be
rectified / replaced by the party / contractor.
3.1.2: The materials such as bricks, sand, cable route markers, RCC slabs
shall be of best quality and the materials approved by Engineer – In – Charge
only shall be used.
3.1.3: Contractor shall provide all necessary labour, tools, plants and other
requisites at his own cost; for carrying out pumping of water and removing of
water from trenches if required anywhere at the time of execution.
3.1.4: Skilled experienced and competent workmen shall be engaged to carry
out Installation of cables with neat workman-ship like manner in accordance
with standard practices.
3.1.5: While laying the cable care shall be taken to avoid formation of kinks
and also damages to the cables. In the case of cable bends, it shall not have
a radius not lesser than 20 times the overall diameter of the cable.
3.1.6: A cable loop of about five meters length and as directed by the
Engineer – In – Charge shall be provide at the following locations.
a. Near the termination point.
b. Near straight through joint.
3.1.7: The method of cable laying and routing of cables, shall in every case be
as directed by the Engineer – In – Charge.
3.1.8: Whenever cable passes through hume pipes/GI pipes embedded
across the wall in a building, both the ends of pipe shall be suitably sealed.
3.1.9: Identification tags indicating the size of the cable and feeder
designation shall be securely attached at both ends of cables. Such tags
shall also be attached to the cable at interval of 250 meters. The materials
of the tag shall be of either 12 SWG GI sheet or Plastic. In case of plastic,
the details have to be engraved and in case of GI sheet, the details should
be punched. Cable route markers shall be provided at the interval of 200
meters with a minimum of 1 No of route marker. The details of route
marker shall be as per the drawing CED/ELE/S/10. At the location of
straight through joint, necessary joint markers shall be provided.
3.1.10: When cable runs vertically, it shall be clamped on mild steel flats or
angle iron grouted on walls and are spaced at such intervals as to prevent
buckling of the cables. All steel works shall be painted with a coat of red oxide
and thereafter finished with two coats of suitable anticorrosive paints.
3.2 Cable laid in ground:
3.2.1: The cable shall be laid at a minimum depth of 0.75 meters when laid in
ground. When cables pass through roads of the centre they must be well
protected by either hume pipes or GI pipes of suitable dimensions properly
sealed at either end and also at the joints with suitable compound to avoid
entry of soil and water.
3.2.2: Excavation of trenches shall be carried out as indicated in the drawing
CED/ELE/S/8 & 9. The width of the trench at bottom shall be 0.4 meters for
one cable. In case the total number of cables laid in trenches is more than
one, then the width shall be such that the spacing between cables is
maintained as shown in the drawing CED/ELE/S/ 8 & 9. Before the cable is
laid in the trench, the bottom of the trench shall be cleared from stones and
other sharp materials and filled with sand layer of 75 mm, as shown in the
drawing.
3.2.3: While removing the cable from the drum, it shall be ensured that the
cable drum is supported on suitable jacks and the drum is rotated to unwind
the cable from the drum. The cable should never be pulled while unwinding
from drum. It shall be ensured that the cables are run over suitable wooden
rollers placed in the trench at intervals not exceeding 2 meters.
3.2.4: After placing the cables in the trench, the sides and top of the cable
shall be covered with bricks/RCC slabs as indicated in the drawing.
After placing bricks or RCC slabs, the trench shall be filled in layers
ensuring that each layer is well rammed by spraying water and consolidated.
The extra earth shall be removed from the trench and deposited at the place
as directed by the Engineer – In – Charge at the time of excavation.
3.3: Cables laid in built up trench:
3.3.1: Before the commencement of cable laying the cable trench shall be
cleaned properly. Cables shall be laid as explained in item 3.2. Cable shall be
properly clamped to the cable supports, which are provided in the cable
trench. The method of clamping shall suit the size of the cable and the cable
supports, as directed by the Engineer – In - Charge.
Care shall be taken while removing and replacing the slabs covering
the trench. It is the responsibility of the contractor to make good any damaged
trench covers.
3.4: Cable terminations and straight through joints:
3.4.1: All cable jointing materials such as straight through joint boxes, cable
compounds, cable lugs, insulation tapes etc. shall be best quality and as
approved by Engineer – In – Charge
3.4.2: Cable glands for strip armored cables shall include a suitable armour
clamps for receiving and securely attaching the armoring of the cable in a
manner such that no movement of the armour occurs when the assembly is
subjected to tension forces.
The cable gland shall not imposed on armoring, a bending radius not less
than 15 times the diameter of the cable. The clamping ring shall be solid and
adequate strength.
Provision shall be made for attachment of an external earthig bond
between the metallic covering of the cable and the metallic structure of the
apparatus to which the cable box is attached.
4.0 Testing: Once the cable is laid, following tests shall be conducted in presence of the
departmental representatives authorized by Engineer – In – Charge, before
energizing the cable.
1. Insulation resistance test (Sectional and Overall).
2. Sheathing continuity test.
3. Continuity and conductor resistance test.
4. Earth test.
5. High voltage test.
Teat conducted shall be as per Indian standard and National Electrical code.
^^^^^^^
Specifications for SCADA and PLCs
SCADA AND PLCs. SYSTEM
9.1 INTRODUCTION
66 KV substation was established at ISAC during year 1984.
Subsequently lot of new equipments like UPS systems, DG Sets,
transformers, Power panels etc were augmented as a part of
various expansion projects. Presently about 4500 KVA of power is
handled with the existing setup. Further as the system was
installed and commissioned during year 1984 it is necessary to
upgrade the system for good power management. System in
present form is operated manually.
With the requirement of power saving by efficient power
management and decrease in manpower it is proposed to adopt
new components like static relays, microelectronics,
microprocessors and digital computers for operation of substation.
By adopting these components several functions of
measurements, instrumentation, data logging, supervision,
monitoring alarm control, protection and automation can be
integrated with the help of SCADA and PLCs. Thus the total
system becomes reliable, economical and versatile and user
friendly.
The system has to be integrated with the NC/Microprocessor
based relays provided in the LT/HT panels and work
homogeneously / harmoniously with each other. The alarm /
protection information can be imported from relays by the PLC
control system.
9.2 PRESENT OPERATING METHOD OF VARIOUS EQUIPMENTS AT SUBSTATION
Main operations carried out at substation are.
1. Monitoring of incoming voltage and making corrections in voltage by
operating ‘On Load Tap Changers’ as and when there is a variation in
incoming KPTCL Voltage.
2. Operation of DG Sets in the event of KPTCL Power Interruptions and
supporting Critical Satellite activities carried out at center. During
operation of LT DG Sets, dynamic load balancing is carried out
manually in order to maintain the balance of load shared by three
machines.
3. Recording various data like incoming Voltage, 11 KV voltage, Load
current, LT Voltage and current of main LT panel and Six Nos of
Change Over Panels, DC Voltage, operating temperatures of
transformer oil and winding, bearing and winding temperature of
alternators and current drawn by capacitor banks. All these readings
are taken hourly round the clock.
4. Recording Maximum Voltage, Minimum Voltage, Maximum Load,
Maximum Demand, Power factor etc at the end of each shift.
5. Recording hourly UPS load details like inverter voltage, inverter
current, O/P frequency etc on round the clock basis.
6. Recording various parameters of Diesel Engines like lub oil pressure,
water jacket temperature, speed, oil temperature and recording various
parameters of alternates like active power, reactive power, power
factor, frequency, voltage and load on each generator.
7. Operation of diesel filling pumps and lub oil priming pumps.
All above operations are carried out manually. Apart from above mentioned works Substation staff is also attending to
electrical complaints received after office hours.
9.3 LIMITATIONS OF PRESENT SYSTEM
1. As mentioned above all the operations are carried out manually. Hence
the element of human error and negligence cannot be totally
eliminated.
2. Recording data and major events manually calls for huge amount of
paper work. Also storing of this data in hard copy form requires
considerable space. Also reproducing, computing and analysis of
manually recorded data consumes lot of time and labour.
3. Two Unit substations i.e. Shaker Substation and Admin Substation are
remotely located. With available manpower it is very difficult to monitor
these substations on hourly basis.
4. Power factor of center is maintained by Three Nos of 500 KVAr and
Two Nos of 200 KVAr capacitor banks. As these capacitor banks are
operated manually, considerable manpower is utilized presently in
maintaining power factor of acceptable value of 0.95 to 0.96 lag.
5. In the event of KPTCL power interruptions, it is very difficult to provide
emergency power supply within short time of Five to Six Minutes. The
problem is aggravated in case staff is busy attending to electrical
complaints at some other location of the center after office hours.
Presently three operators per shift are available for operation of
Substation.
6. During emergency situations like power failures some fast decisions
pertaining to synchronizing of generators, Change over operations and
load management is required to be taken. These critical decisions can
be carried out by automation and problems due to human interventions
and human errors can be avoided
9.4 FOLLOWING ARE THE MAIN FUNCTIONS THAT HAS TO BE AUTOMATED BY SCADA AND PLCS
Operational Control
1. On/Off operations of circuit breakers.
2. Control of power factor by operation of capacitor banks.
3. Remote operation and data logging of Admin and Shaker
Substation.
4. Remote operation and data logging of 2 X 120 KVA UPS system.
5. Maintaining the voltage level of substation bus within specified limits
by tap changing operations of OLTC.
6. Automatic switching sequences during EB power failures and
restoration of EB supply.
7. System shall be capable for independent measurement, control and
protection of the system.
8. Remote monitoring various operating conditions of DG sets like
Water temperature, Lub oil pressure, speed, oil temperature etc.
9. Automatic ON/OFF operation of lub oil priming pumps and diesel
filling pumps.
Operational Supervision
1. Data acquisition and presentation of quantities such as power,
voltage, current, temperature of oil and winding in transformers,
water level of cooling towers etc.
2. Breaker position and indication of fault signal.
3. Acquisition of metered electrical parameters like voltage, current
and power factor.
4. Monitoring of limit values such as maximum demand, pf etc.
5. Supervision of limiting values such as maximum load on
transformers, maximum load on feeders, minimum and maximum
bus voltage. Ambient temperature etc.
6. Sequential events recording.
7. Compiling of energy reports.
System protection
1. Optimum loading of feeders and machines such as generators and
transformers to ensure reliable supply and avoid outages.
2. Setting of trip levels to suit loading conditions.
3. Determine switching sequence of various machines and feeders.
4. Quick identification of faults and faster switching to bypass supply in
the event of failure of main supply.
9.5 ADDITIONAL PROVISIONS FOR SCADA AND PLC SYSTEM
Automation of 66 KV Substation with integrated functions of system
protection, operation control and monitoring features. The system shall be
consisting of following.
1. Instrumentation.
2. Control.
3. Monitoring.
4. Protection.
Instrumentation system shall be suitable for data acquisition, data
transmission, data monitoring, data logging etc. These devices shall be
capable of measurements, recording display and interact with control and
protection system.
Controlled quantities shall be sensed by control system and it shall
bring the controlled quantities within targeted limits.
Monitoring system shall have suitable Remote Terminal Units (RTUs)
that shall be capable of Acquisition of information (Measured values, signals,
alarms, meter reading etc), Monitoring of command/instruction, Recognition of
changes in signal input state and sequential recording of events and
Processing of information transmitted to and from remote station to master
control center.
Protection system shall be capable of protecting the system from
abnormal quantities such as short circuit, over current, under voltage, over
temperature etc.
SCADA and PLC system shall be arranged to perform the following
integrated tasks.
1. Data collection (Data Acquisition).
2. Data transmission (Telemetry).
3. Scanning, Indication, Monitoring, Logging.
4. Execution of operating command.
5. Supervision of system, alarms and report any uncommon change of
state.
6. Control and indication.
7. Ensure sequential operation.
8. Data presentation, display and reporting.
9. System Protection.
1. Data Collection equipment (Data Acquisition) Data consisting of electrical and mechanical variables, On/Off status of
switchgear, change of state, sequence of events, time of occurrence etc
shall be acquired by means of CTs, VTs and other forms of collecting
information. Time interval of various quantities shall be adjustable. Typical
scanning time is given below.
SL No
Quantity Unit Input interval / Check Interval
1. 1.1. 1.2. 1.3. 1.4. 1.5 1.6. 1.7
Incoming Supply (66 KV Bus). Active Power Reactive Power Apparent Power Power Factor Maximum Demand Incoming Voltage Line Current
KW KVAr KVA - KVA KV Amps
1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes
SL No
Quantity Unit Input Interval / Check Interval
2. 2.1. 2.2. 2.3. 2.4. 2.5. 3. 3.1. 3.2. 3.3. 3.4. 3.5. 4. 4.1. 4.2. 4.3. 4.4. 4.5. 4.6
Load on transformers and feeders. Active Power Reactive Power Apparent Power Phase Voltages Line Currents. Limiting Values Maximum Busbar Voltage Minimum Busbar Voltage Trip Circuit Voltage (DC) Load on transformers Load on Feeders. General Winding temperature of Transformer / Alternator / Motors Oil temperature of transformer Ambient temperature of various locations Breakers Condition Isolator Condition Protection signal
KW KVA KVAr Volts Amps KV KV Volts Amps Amps OC OC
OC 0/1 0/1 0/1
1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes 1 to 30 Minutes 1 Minute 1 Minute 1 Minute 1 Minute 1 Minute 1 to 15 Minutes 1 to 30 Minutes 1 to 30 Minutes If Changed If Changed If Occurred
Above Variables (and additional variables if required) shall be fed to
the input interface of scanner. Data collection equipment shall feed
digitized data to computer for further processing.
2. Data Transmission
Data Transmission system shall comprise of suitable devices for
handling bi-directional data for supervision and control. Data received
from VTs, CTs etc shall be transmitted to control terminal for
processing. The instruction from control center shall be send to remote
locations and remote stations (Admin and Shaker). The system shall
be capable of handling the peak traffic with acceptable degree of
security demanded against error or loss of information.
3. Scanning and indications
The scanning shall give necessary data regarding the value of various
input variables. The automatic system control necessitates a series if scans
and checks at regular intervals, which shall provide indication whether and
when appropriate action can be initiated.
4. Execution of operating command
The system should have user friendly Man – machine interface and
remote control interface and shall be capable of executing following
commands issued by operator or computer.
4.1. Operation of circuit breakers.
4.2. Voltage control by operation of OLTCs.
4.3. Disturbance recording.
4.4. Starting, Synchronizing and loading of DG Sets and its auxiliaries.
4.5. Load shedding / Load reconnection.
4.6. Stopping of DG sets after required time of no load running.
4.7. Automatic system restoration/normalization.
4.8. Any other desired function.
5. Supervision of system alarms and report any uncommon change of state. System shall independently supervise position of circuit breaker, record
of events, energy metering, self-supervision of system etc.
Alarm in the form of Audio Visual indication shall be available to
operator in control room. The alarm should indicate uncommon events such
as abnormal values of voltage, currents, temperature, low voltage of
protection circuit, unusual events etc calling for supervisors immediate
attention and interventions if necessary. Overwhelming operator with certain
transient alarms may be suppressed. The system shall have facility to restrain
certain short-lived but repetitive transient alarms for a set period. These
conditions shall be brought to the notice of operator only when they still
persist after a set period and are not cleared by the system itself.
6. Controls and Indication. Following functions shall form the part of control and indication facility. 6.1. Control of ON/OFF position of devices such as circuit breakers,
isolators, earthling devices, starters etc. These indications shall be in
the form of ON/OFF state on Control board/Mimic diagrams.
6.2. Control position of tap changers.
6.3. Set point control to provide set point to a controller located at remote
substation.
6.4. Any other desired control function.
7. Ensure sequential operation
System shall be capable of carrying out following major sequential
operations.
7.1. Execution of predetermined switching sequences while shifting loads
from one source to another.
7.2. Ensuring positions of circuit breakers, starting and synchronizing of
alternators.
7.3. Operation of tap changers to bring tap changer to required tap position
in the event of power failures.
7.4. Operation of opening circuit breaker, isolator and earthing switches in a
particular sequence and another sequence during closing of circuit
breakers.
8. Data Presentation, display and recording.
All data regarding system parameters and network configuration shall
be made available to operator in control room whenever he presses
appropriate button on control desk.
Following types of data are to be made available on control desk.
8.1.1. Tabulated values of parameters, measured values and computed
values.
8.1.2. Symbolic representation of equipment status in the form of mimic
diagram of substation and synoptic displays of part of network.
Operator desk shall have following displays. 8.2.1 Alphanumeric display :These displays should give direct reading
of measured parameters, identification of parameters and its
numeric value.
8.2.2 Single parameter display : For certain parameters several
measured data are required to be displayed in tabular form.
8.2.3 Mimic Diagram display : Single line diagram of system with
position of CBs and isolator and power flow shall be indicated.
8.2.4 Alarm display : Alarm and annunciations shall be displayed on
control board for attention or intervention of operator.
9. System Protection.
Data from the protection system at substation should be acquired
independently, should be processed, evaluate the same and take action to
perform following tasks
9.1.1. Sensing abnormal conditions and detection of faults at the earliest.
9.1.2. Annunciation of abnormal conditions.
9.1.3. Alarm for abnormal conditions. 9.1.4. Automatic tripping of breakers in case of faults.
9.1.5. Disconnect faulty line. 9.1.6. Detect phase to phase fault and phase to ground fault.
9.1.7. Overloading protection. 9.1.8. Over heating protection.
9.1.9. Over current protection.
9.1.10. Abnormal Voltage prevention.
@@@@@@
Check List for commissioning of
installations
Check list of transformers (General Checks) Delete whichever is not applicable
SL No Description
Remarks
1
Size of cable
2 Size of bus-bar, spacing and clearance 3
Size of bus-bar supports and spacing between supports
4 Size of Flexible connections at bushings 5 Flexibility of flexible connection 6 Clearance around the Transformer 7 Ventilation of the bus duct and Transformer room 8 Oil drain facilities of the Transformer 9 Fire protection wall
10 Fire fighting arrangement 11 Position of radiator valve 12 Position of conservator shut off valve 13 Buchholtz relay and oil surge rely pipe line 14 Oil level in main conservator 15 Oil level in buchholtz relay and OSR 16 Oil level in bushing 17 Whether air in bushing released 18 Oil level in breather 19 Colour of silica gel in breather 20 Whether contacts of WTI checked 21 Whether contacts of OTI checked 22 Whether calibration of the WTI checked 23 Whether calibration of the OTI checked 24 Whether working of WTI / RTD repeaters checked at the
control room
25 Angle of mounting of Buchholtz relay 26 Movement of Float of Buchholtz relay 27 Whether air released in Buchholtz relay 28 Movement of float level in the magnetic oil level gauge 29 Earthing of neutral 30 Earthing of body 31 Earthing of main tank and top cover 32 Earthing of marshaling box and T/C driven gear 33 Earthing diverter switch 34 Earthing of pumps 35 Earthing of fan motor 36 Earthing of bushing test tap
SL No
Description Remarks
37 Earthing of cable glands / termination 38 Earthing of OLTC 39 Setting of arcing horn gap of bushing 40 Perfection of connections to bushings 41 Perfection of connection to tap changers 42 Perfection of connection to earth leads 43 Perfection of connection to control and protective cables 44 Perfection of connection to thermometers 45 Manual operation of Tap changer 46 Local electrical operation of Tap changer 47 Remote electrical operation of Tap changer 48 Parallel operation of Tap changer 49 Oil flow of cooler unit 50 Thermometer setting of cooler unit 51 Control cable connections between transformer
accessories and marshaling box
52 Control cable connections between marshaling box and Sub-station panel
53 Control cable connections between Tap changer control cubical and Sub-station panel
54 Space heater in cubicles 55 Space heater in conservator tank 56 Water pressure in water cooled Transformer 57 Oil pressure in water cooled Transformer 58 Angle of protection of lighting shield 59 Position of roller blocks 60 Name plate details of the Transformers 61 Name plate details of protection C.Ts 62 Placement of protection C.Ts 63 Placement of lightning arrestors 64 Manual operation of primary breaker 65 Electrical operation of primary breaker 66 Manual operation secondary breaker 67 Electrical operation of secondary breaker 68 Electrical operation of secondary breaker 69 70 77
Check list for Transformers (Functional Checks) Delete whichever is not applicable
Sl No.
Description
Settings
Remarks
1 Buchholtz alarm 2 Buchholtz trip 3 OTI alarm 4 OTI trip 5 WTI alarm 6 WTI trip 7 OLTC – OSR –trip 8 WTI /RTD repeater at control room 9 Low oil level alarm
10 REF relay 11 Differential relay 12 Back up O/C relay for current 13 Back up O/C relay for time 14 Back up earth fault relay for current 15 Back up earth fault relay for time 16 O/V relay for Voltage 17 O/V relay for time 18 Instantaneous O/V for Voltage 19 Over fluxing relay for Voltage 20 Over fluxing relay for Frequency 21 Over fluxing relay for time 22 Fan for over current 23 Oil pumps for over current 24 Setting of arcing horn gap
Checklist for cables Delete whichever is not applicable
Name of feeder: ________________________________________________ Sl No.
Description
Remarks
1. Type of cable 2. Cross section area of conductor 3. Length of cable 4. Voltage grade of cable 5. Direction of power flow 6. Crimping of the cable conductor 7. Seating of the cable conductor and surface
contact
8. Whether spring washers are used 9. Whether the bending is avoided near to the cable
entry box
10. Whether clamping provided at 45 cms from termination.
11. Size of the cable gland. 12. Proper fixing of cable gland. 13. Size of earthing of cable gland. 14. Size of earthing clamp of cable gland 15. Surface contact of earth clamps at cable gland. 16. Tinning of contact surfaces at cable gland. 17. Perfection of fixing armour at cable gland 18. Bending radius at bendings. 19. Whether clamped at both ends of bending 20. Enroute clamping of the cable 21. Dressing of cables in trays and racks 22. Whether cable identification tag provided 23. Mechanical protection at crossing and take offs 24. Mechanical protection at floor crossings. 25. Fire prevention barrier in cable ducts at floor
levels.
26. Segregation of cables of different voltages 27. Segregation of control and power cable 28. Support for cables in cable trays 29. Support for cable trays and cables 30. Support for cable racks and cables
Sl No.
Description
Remarks
31. Size of earth continuity strip through trays and racks.
32. Tap off of earth continuity strip 33. Joints In earth continuity strip 34. Mechanical protection at the rising from
floors.
35. Mechanical protection at bends 36. Mechanical protection on ground 37. Whet
her manufacturers identification provided on cables
38. Whether separate racks provided for cables of different voltages.
39. Whether highest voltage cable is in the bottom most rack and lower voltage in the upper racks of cable trenches.
40. Whether DC and AC control cables are segregated.
41. Whether FRLS cables are used in hazardous areas.
42. Whether cables trenches filled with dry sand in hazardous location
43. Whether double compression glands are used at hazardous areas.
44. Insulation Values of cable 45. Phase sequence Note: Separate checklist may be exercised for each cable.
Checklist for LT & HT Panels Delete whichever is not applicable
Name of Panel: _________________________________________________ Sl No.
Description
Remarks
1. All-round clearance. 2. Dimensions of Panel
3. Dimensions of Cable alley
4. Dimensions of Busbars 5. Position of panel over trench
6. Whether tools and foreign equipments removed 7 Cleanness and dryness inside panel
8 Whether unused cable glands are closed
9 Whether all temporary connections made during installation work has been removed
10 Whether all meters are in working conditions. 11 IP classification of panel 12 Mounting of circuit breakers, MCCBs, switches
and switchgears.
13 Whether Rating of circuit breaker, switches, switchgears and HRC fuses are as per specifications
14 Trial operation of all switchgears including circuit breakers
15 Functioning of Interlocking wherever provided. 16 Alignment of draw out switchgears 17 Checks for door dimensions, interlocking,
handles, hinges etc.
18 Whether live terminals at the backside of the doors interlocked.
19 Materials for shrouding and its thickness 20 Cross section area of the busbar 21 Spacing between the busbars 22 Spacing between supports 23 Interconnection of bus bar and joints 24 Connections to switches and contactors 25 Number of tap offs from a point 26 Tightness of bus bar supports 27 No of runs of cables 28 Voltage grade of cables 29 Cross section area of cables
Sl No.
Description
Remarks
30 Seating, tightness and termination of conductors. 31 Segregation of power and control cables 32 Dressing and clamping of cables 33 Bending radii of cables 34 Whether name / identification tags provided for
cables.
35 Rating of terminal blocks 36 Compartmentalization between live open
terminals.
37 Earthing and termination of gland plates. 38 Segregation between power, control and
measurement terminal blocks.
39 Whether polarity of the terminal block for external DC supply marked.
40 Size of control and measurement cable. 41 Connections of measurement and protection CTs 42 Whether control wiring done as per specifications 43 Whether crimping portion covered with sleeves. 44 Provision for ventilation and cooling. 45 Provisions for heaters 46 Size of earth bus 47 Earthing of doors, SFUs, switchgears etc. 48 Whether direction of power flow marked at cable
take offs and entries.
49 Whether cable labeled at required locations 50 Height of indicating instruments and operating
handles, push buttons etc.
51 Workmanship and finish of doors, panels and covers.
52 Quality of welding, grinding, sanding, filing, painting and finish.
53 Quality of rubber mats provided in front of the panel.
Guaranteed Technical
Particulars
Item: 11 KV HT Panel.
Sl. No. Item Particular. Details to be furnished by tenderer.
1. Name of Manufacturer.
2. Applicable standards.
3. Rated continuous current.
4. Rated frequency.
5. No Of poles.
6. Rated voltage.
7. Basic Insulation level.
8. Rated short time withstand
current.
9. Rated short circuit current.
10. Rated short circuit making
current.
11. Operating mechanism.
12. Continuous Bus bar rating.
13. Bus bar material.
14. Operating sequence.
15. Control Voltage.
16. Type of breaker.
17. Type of Interlocking
arrangements between
various breakers.
18.
Type of end terminations.
Sl. No. Item Particular. Details to be furnished by tenderer.
19. Rating and type of surge
arresters.
20. Make and type of relays.
21. Whether Communication
facility provided?
22. Type and make of
measuring instruments.
23. Type, Class and make of
CT.
24. Burden and ratio of CT.
25. Type, Class and make of
PT.
26. Burden and ratio of PT.
27. Opening time of breaker.
28. Closing time of breaker.
29. Degree of protection of
panel.
.
Item: Power Control Center
The tenderer shall fill in this data sheet and submit along with his offer.
Offer of parties not furnishing below mentioned details are liable to be
rejected. Separate details may be furnished for individual panels in following
format.
Panel Details: i) Make.
ii) Type of enclosure.
iii) Thickness of sheet Metal.
iv) Class of protection.
Bus Bar: i) Bus conductor.
ii) Material and grade.
iii) Area of cross section (mm2).
iv) No. Of busbar per phase.
v) Current density (A / mm2).
vi) Minimum clearance of bare bus and connections.
vii) Phase to Phase (mm).
viii) Phase to Earth (mm).
ix) Busbars provided with.
x) Insulating sleeve.
xi) Insulating barriers.
xii) Bus support insulator.
xiii) Make.
xiv) Material.
xv) Voltage Class.
xvi) Power frequency withstand voltage for 1 minute KV.
xvii) Minimum total creep age distance (mm).
Current Transformer:
i) Type.
ii) Make.
iii) Frequency and Voltage.
iv) Pole.
v) Ratio.
vi) Rated VA burden.
vii) Accuracy class.
viii) Class of Insulation.
ix) Temperature rise above 45oC ambient.
x) C.T. Standard (IS / BS).
xi) Mounting.
xii) Dimension and weight.
Relays:
i) Inverse time over current relay.
ii) Whether release is microprocessor based.
iii) IDMT over current with Instantaneous.
iv) Aux. Relays.
v) Self Reset.
vi) Hand reset.
vii) Standard to which the relays conform.
viii) Selector switch.
ix) Make.
x) Type.
xi) Contact rating.
xii) Control supply voltage 220V DC.
.
Push buttons:
i) Make.
ii) Type.
iii) No. Of NO and NC contacts.
iv) Contact rating.
v) 240 V AC.
vi) Lamps.
vii) Make.
viii) Type.
ix) Rating.
x) External resistance value.
Switch Gear assembly:
i) Breaker provided with service test and withdrawn positions.
ii) Type of indication provided for breaker positions.
iii) Cubicle door can be closed with breaker in service or test or
withdrawn position?
iv) 1 minute power frequency withstand voltage, KV rms.
v) Ground bus.
vi) Material and size.
vii) Control wiring.
viii) Size and type.
ix) No. And size of strands
x) Insulation.
xi) Voltage class.
.
ACBs:
i) Breaker provided with service, test and isolated positions?
ii) Type of indication provided for breaker positions.
iii) Make.
iv) Type.
v) Whether microprocessor based release provided?
vi) Operating temperature above ambient without derating.
vii) Whether communication facility provided?
viii) Breaking Capacity of breaker:
ix) Whether breaker (If applicable) rated for capacitor duty.
x) Applicable Standards:
xi) Number of Auxiliary contacts:
xii) Whether breaker is motorized with optional manual
operation.
MCCBs:
i) Make.
ii) Type.
iii) Breaking Capacity.
iv) Operating temperature above ambient without derating.
v) Whether microprocessor based releases provided.
vi) Applicable Standards.
.Control terminal blocks: i) Make.
ii) Voltage grade.
iii) Current rating.
iv) Type of terminal.
v) Suitable for copper cable sizes mm2.
vi) Percentage of Spare terminals furnished.
Multidata measurement meter:
i) Make.
ii) Type.
iii) Whether all measurements are true RMS?
iv) Whether communication facility provided?
v) Whether bar graph format for measured parameters
available?
vi) Total VA requirement.
vii) Auxiliary Supply.
viii) Size.
General: i) Whether switchgears units are front or inside mounted?
ii) Whether key interlock furnished in front mounted?
iii) Whether switchgear assembly shall be completely assembled,
wired and tested at factory?
iv) Overall dimensions of panel in mm (L X B X H).
v) Whether insulating rubber mats will be provided in front portion
of panel?
vi) Approximate weight in Kgs.
vii) Applicable standards.
viii) Shipping Dimensions (L X B X H) in mm.
Item: 1.1 KV LT XLPE Cables.
Sl. No. Particulars. Details to be furnished by Party. 1. General. 1.1
Manufacturer’s Name.
1.2 Place of manufacture. 1.3 Manufacturer’s type
Designation.
1.4 Make. 1.5 Type. 1.6 Standard applicable. 1.7 Voltage grade. 1.8 Suitable for service voltage and
system of Earthing.
2. Conductor. 2.1 Maximum conductor
temperature.
2.1.1 Continuous. 2.1.2 Short time. 2.2 Material. 2.3 Form of conductor
(Stranded/solid Etc).
2.4 Number of cores. 2.5 Number and diameter of wires
per core.
3. Insulation. 3.1 Material. 3.2 Thickness. 3.3 Average dielectric strength. 3.4 Dielectric Constant. 3.5 Suitability with regard to
temperature, moisture, ozone, acid and alkaline surroundings.
3.6 Softening temperature of material.
4. Sheath. 4.1 Material of sheath over
conductor if any.
4.2 Thickness of sheath over conductor.
Sl.No. Particulars. Details to be furnished by Party.
4.3 Material of sheath over cables. 4.4 Thickness of sheath over
cables.
4.5 Material and thickness of metallic sheaths if any.
5. Approximate net weight of cable for 100 meters length (Kg).
6. Other data. 6.1 Compound used between inner
layers of conductor if any.
6.2 Binder, if any 6.3 Fillet material. 6.4 Sheath material. 6.5 Water proof compound. 6.6 Servicing if any, 6.7 Type of end terminations and
material required.
6.8 Type of straight through joints and material required.
6.9 Standard Drum Length. 7. Electrical performance. 7.1 Conductor resistance. 7.2 Max. Conductor temperature
permissible.
7.2.1 Under full load. 7.2.2 Under transient conditions. 7.2.3 AT 10 degrees Centigrade. 7.3 Max operating voltage. 7.4 Insulation resistance. 7.5 Tan delta of dielectric material. 7.6 Dielectric loss per KM at rated
voltage.
7.7 Power frequency withstands voltage (Kv rms).
7.8 Current loading data for the cable for specified operating temperature when laid in.
7.8.1 In air / in cable trenches. 7.8.2 In cable channels. 7.8.3 In ground. 7.8.4 In closed ducts.
Sl. No. Particulars. Details to be furnished by Party.
7.8.5 In cable conduits and pipes. 7.9 Derating factor for. 7.9.1 Ambient temperature. 7.9.2 Grouping of 3 or 4 cables in air,
in trays, in ground for different spacing,
7.10 Allowable short circuit current. 7.11 DC withstand voltage. 7.12 AC 50 Hz impedance. 7.13 AC 50 Hz Reactance. 7.14 Type of armour.
Item: 11 KV HT XLPE Cable.
Sl. No. Particulars. Details to be furnished by Party.
1. General. 1.1 Manufacturer’s Name. 1.2 Place of manufacture. 1.3 Manufacturer’s type Designation. 1.4 Make. 1.5 Type. 1.6 Standard applicable. 1.7 Voltage grade. 1.8 Suitable for service voltage and system of
Earthing.
2. Conductor. 2.1 Maximum conductor temperature. 2.1.1 Continuous. 2.1.2 Short time. 2.2 Material. 2.3 Form of conductor (Strand Etc). 2.4 Number of cores. 2.5 Number and diameter of wires per core. 3. Insulation. 3.1 Material. 3.2 Thickness. 3.3 Average dielectric strength. 3.4 Dielectric Constant. 3.5 Suitability with regard to temperature,
moisture, ozone, acid and alkaline surroundings.
3.6 Softening temperature of material. 4. Sheath. 4.1 Material of sheath over conductor if any. 4.2 Thickness of sheath over conductor. 4.3 Material of sheath over cables. 4.4 Thickness of sheath over cables. 4.5 Material and thickness of metallic sheaths
if any.
. Sl. No. Particulars. Details to be furnished by Party.
5. Approximate net weight of cable for 100 meters length (Kg).
6. Other data 6.1 Compound used between inner layers of
conductor if any.
6.2 Binder, if any 6.3 Fillet material. 6.4 Sheath material. 6.5 Water proof compound. 6.6 Servicing if any 6.7 Type of end terminations and material
required.
6.8 Type of straight through joints and material required.
6.9 Standard Drum Length. 7. Electrical performance. 7.1 Conductor resistance. 7.2 Max. conductor temperature permissible. 7.2.1 Under full load. 7.2.2 Under transient conditions. 7.2.3 AT 10 degrees Centigrade. 7.3 Max operating voltage. 7.4 Insulation resistance. 7.5 Tan delta of dielectric material. 7.6 Dielectric loss per KM at rated voltage. 7.7 Power frequency withstand voltage- Kvrms 7.8 Current loading data for the cable for
specified operating temperature when laid in.
7.8.1 In air / in cable trenches. 7.8.2 In cable channels. 7.8.3 In ground.
7.8.4 In closed ducts. 7.8.5 In cable conduits and pipes. 7.9 Derating factor for, 7.9.1 Ambient temperature. 7.9.2 Grouping of 3 or 4 cables in air, in trays, in
ground for different spacing.
7.10 Allowable short circuit current. 7.11 DC withstand voltage. 7.12 AC 50 Hz impedance.
. Item: 3.15 MVA Transformer. Sl. No. Particulars. Unit. Details to be
furnished by manufacturer.
1.1 Name of manufacturer.
1.2 Service.
1.3
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
Rating.
Rated KVA.
Rated Voltage of HV.
Rated Voltage of LV.
Temperature – rise by
resistance of winding.
Temperature rise in oil.
Rated frequency.
KVA
KV
KV oC
oC
c/s
1.4 Number of phases.
1.5
1.5.1
1.5.2
1.5.3
Connections.
High Voltage.
Low Voltage.
Vector Group
Reference.
1.6 Tappings:
High Voltage.
Low Voltage.
Percentage
Percentage
1.7 No – Load loss at rated
voltage and frequency.
KW
1.8 Load losses at rated
current at 75 oC.
KW
1.9 Impedance at rated
current and frequency.
Percentage
Sl. No. Particulars. Unit. Details to be furnished by manufacturer.
1.10 Reactance at rated
current and frequency.
Percentage
1.11
1.11.1
1.11.2
1.11.3
Efficiencies at 75 oC at
unity power factor.
At full load.
At 3/4 full load.
At 1/2 full load.
Percentage
Percentage
Percentage
1.12
1.12.1
1.12.2
1.12.3
1.12.4
Regulation at full load
at 75 oC.
At unity power factor.
At 0.85 Power factor.
At 0.90 Power factor.
At 0.95 Power factor.
Percentage
Percentage
Percentage
Percentage
1.13 No – Load current at
rated voltage and
frequency.
Percentage
1.14
1.14.1
1.14.2
1.14.3
1.14.4
Approximate Weights:
Core and Windings.
Tank and Fittings.
Oil.
Total Weight.
Kg
Kg
Kg
Kg
1.15 Approximate Quantity
of oil.
Liters
Sl. No. Particulars. Unit. Details to be furnished by manufacturer.
1.16
1.16.1
1.16.2
1.16.3
Approximate Overall
Dimensions:
Length,
Breadth,
Height.
mm
mm
mm
1.17 Terminal Arrangement:
High Voltage.
Low Voltage.
1.18 Reference Standard.
1.19 Approximate Maximum
Flux Density at rated
Voltage and frequency.
C.G.S.Lines/
cm2
1.20
1.20.1
1.20.2
1.20.3
Efficiencies at 75 oC at
0.8 power factor
lagging:
At full load,
At ¾ full load,
At ½ full load.
Percentage
Percentage
Percentage
1.21 Load at which
maximum efficiency
occurs.
Percentage
full load
1.22 Maximum Efficiency. Percentage
1.23
1.23.1
1.23.2
Impulse level with 1/50
wave:
High Voltage side.
Low Voltage side.
Kv
Kv
Sl. No. Particulars. Unit. Details to be furnished by manufacturer.
1.24 No Load loss at 110
percent rated voltage
and rated frequency.
KW
1.25 No load current at 110
Percent rated voltage
and rated frequency.
Percentage
1.26
1.26.1
1.26.2
Type of winding:
High Voltage.
Low Voltage.
1.27
1.27.1
1.27.2
1.27.3
1.27.3
Insulation material:
Turn Insulation high
voltage.
Turn insulation low
voltage.
Insulation core to low
voltage.
Insulation high voltage
to low voltage.
1.28
1.28.1
1.28.1.1
1.28.1.2
Clearance:
Minimum clearance
between phases.
In oil.
Out of oil.
mm
mm
.
Sl. No. Particulars. Unit. Details to be furnished by manufacturer.
1.28.3
Minimum clearance
high voltage to tank in
oil.
mm
1.29
1.29.1
Details of tank:
Approximate thickness
of sides.
mm
1.29.2
1.29.3
1.29.4
Approximate thickness
of bottoms.
Approximate thickness
of cover.
Approximate thickness
of tube radiators.
mm
mm
mm
1.30 Minimum clearance
height for lifting core
and windings from tank
mm
1.31
1.31.1
1.31.2
1.31.3
1.31.3.1
1.31.3.2
Shipping Details:
Parts detached for
transport.
Approximate Weight of
heaviest package.
Approximate.
dimensions of largest
package.
Length.
Breadth.
Kg
mm
mm
Sl No. Particulars. Unit. Details to be furnished by manufacturer.
1.31.3.3 Height. mm
1.32
1.32.1
1.32.2
Details of bushing:
Type.
Momentary power
frequency dry withstand
voltage.
KV
1.32.3
1.32.4
1.32.5
1.32.6
1.32.7
1.32.8 1.32.9
1.32.10
Visible power
frequency discharge
voltage.
One minute wet
withstand power
frequency voltage.
Under oil flashover or
puncture withstand
power frequency
voltage.
Full wave withstand
impulse voltage.
Under oil flashover or
puncture withstand
impulse voltage. Creepage distance in Air
Recommended gap
setting. Weight of Assembled
Bushing.
KV
KV
KV
KV
KV
mm
mm
Kg
. Item: Bus duct.
The manufacturer shall furnish the following technical particulars
along with his offer.
Sl. No. Particulates. Details to be furnished
by manufacturer.
1. Cross sectional dimensions of the duct.
2. Size and material of the conductor
for phase and for the
neutral.
3. Normal current rating for a
temperature of 85 Deg.C with
maximum ambient temperature.
4. Short time rating in KA for one
second.
5. Clearance between live parts and
ground and between phases.
6. Material of the busbar supports.
________
The brief Sequence for Execution of
work
The work is to be executed in substation, which is a prime source for
power supply to very critical loads of the Center. As most of the works
carried out in the Center are basically R & D related, maintenance of
power supply to various loads of the Center is most important. In this
regard it is required to carry out the entire work in systematic and
meticulous way with the objective of maintaining power supply to
critical loads of the Center without much interruptions.
It may be noted that for removal of operational panels and
installation of new panels prior shutdown of concerned panels are
required. Also installation of LT and HT panels are to be carried out on
holidays. Therefore execution of this work may take more time
compared to standard works. For executing the work smoothly a brief
sequence is worked out as follows. However it may be noted that there
may be deviations from the below mentioned sequence depending
upon various circumstances and site conditions.
Sequence of work for implementing RUPS auxiliaries at ISAC
Campus.
PHASE – 1 WORKS.
A. Installation of Panel A.
1. Removals of all feeders and incoming bus duct of M5.
2. Removing coupling between M5 and 9127.
3. Removal of Panel A, M5, End and shifting the
removed panel to stores.
4. Installation of new Panel A, M5, End with bus coupler
and new bus duct.
5. Removals of all feeders and incoming bus duct of
9127.
6. Removing coupling between 9127 and 9126.
7. Removal of Panel A, 9127, Middle and shifting the
removed panel to stores.
8. Installation of new Panel A, 9127, Middle with bus
coupler, bus duct and coupling it with M 5, which was
installed earlier.
9. Removals of all feeders and incoming bus duct of
9126.
10. Removal of Panel A, 9126, Beginning and shifting the
removed panel to stores.
11. Installation of new Panel A, 9126, Beginning with bus
duct and coupling it with bus coupler of 9127.
12. Providing mechanical and electrical interlocking
between all incomers and bus couplers.
B. Installation of 11 KV HT Panel.
1. Removal of NGEF Incomer and 2 MVA transformer breakers
and bus coupler.
2. Removal of DG Incomer panel and coupling box.
3. Installation of new HT Panel having one EB incomer, one DG
incomer, four feeder breakers and bus coupler.
4. Removal of Voltas Incomer, DG incomer and existing five feeder
breakers.
5. Installation of new HT panel with one EB Incomer one DG
Incomer and five feeder breakers.
6. Coupling Voltas portions of panel with earlier installed bus
coupler.
7. Shifting of 2 Nos of MEI make 11 KV panels and installation of it
in DG room 11 KV panel.
8. Shifting of 2 Nos of Alsthom make VCBs, fabrication of outdoor
kiosk and installation of outdoor Kiosks at Shaker and Admin
Substation.
C. Associated works.
1. Shifting the loads from COP 4 and removal of COP4.
2. Shifting the loads from COP 5 and removal of COP5.
3. Shifting the loads from COP 2 to Panel A and removal
of COP2.
4. Retrieval of spare cables if any from COP4, COP5 &
COP2.
5. Removal and replacement of HT outdoor kiosks of
Shaker Substation and Admin S/S with alternate
arrangement for temporary supply.
PHASE –2 WORKS.
D. Installation of No Break Panel
E. Installation of Short Break Panel 1
F. Installation of Short Break Panel 2
G. Installation of 3.15 MVA Transformer.
1. Installation of transformer as detailed in specification of
transformer.
2. Installation of RUPS input panel.
3. Interconnection of Bus Duct from transformer to RUPS input
panel.
H. Providing SCADA and PLCs
>>>>>>>
Completion Report
Name of work: Implementation of RUPS Auxiliaries at ISAC.
After completing the electrical installation works of LT/HT installation or making additions in existing LV/HV installation, the party who has carried out the installation shall carry out all pre commissiong tests in the following format and shall form the part of completion report.
Completion report shall contain copies of following tests.
1. Full nameplate details of installed equipments like transformer,
breaker etc. 2. Test results of transformers, cables, breakers, panels and
SCADA. 3. Test result of relays.
4. Teat result of transformer oil.
Format for Completion Certificate.
I / we certify that the installations under the work of implementation of RUPS auxiliaries at ISAC has been installed by me / us and tested as that to
the best if my / our knowledge and belief, the installation complies with provision of IER 1956 and other relevant codes of practice for electrical
installation.
1. Voltage and system of supply. 2. Particulars of work and test results.
a. Transformer Rating. Voltage Make Serial number Year of manufacture Result of insulation test Results of earth resistance and
continuity tests. Result of other relevant tests.
b. HV Cables.
Length of cable and number of terminations/joints.
Result of insulation tests Result of HV withstand test Result of earth resistance
and continuity test Result of other relevant
tests.
c. MV cables Result of Insulation resistance tests Result of continuity test
d. Relay.
Result of relay and control wiring
Result of tests of protection and measurement CT
Result of tests of PTs e. Panels (Separate details for each panel)
System Voltage Type and routine Test results of
breakers. Earthling of panel Insulation resistance value
1. Signature of Site Engineer / supervisor of party with name and address and permit number of the Supervisor.
2. Signature of the contractor with name and address with contract Licensee number of the contractor.
Ccccccc
Special terms and conditions
Special terms and conditions.
Name of work: Implementation of RUPS auxiliaries at ISAC.
1. Only ISO certified parties may quote. Offers of non-ISO parties
will not be considered. 2. Parties participating in the tenders should have experience of
having executed single project of similar nature and of value not less than Rupees hundred lakhs.
3. Only the Offers of original equipment manufacturers will be considered.
4. Client list giving details of similar nature of electrical projects carried out along with supporting documents like purchase orders / work orders / completion certificates may be furnished along with the offer clearly indicating the nature and magnitude of work done.
5. Parties shall have minimum experience of 5 years in similar nature of projects.
6. In order to have minimum interruption in the power supply, temporary panels of 11 KV / 415 V having suitable feeders shall have to be installed on temporary basis before installing the new panels.
7. Most of the works are required to be carried out during holidays and after office hours only.
8. All the security regulations must be strictly followed inside the campus.
9. No assistance in the form of manpower or material will be provided by the Department except for those already mentioned in this document.
10. Rates quoted by parties for phase 1 and Phase 2 shall be valid
for one year from the date of opening of price bid.
11. Successful tenderer shall furnish detailed program regarding execution of the work in the bar chart and CPM chart format. Work execution program shall be submitted within 15 days of the award of PO. On approval of the same by Department, this execution program and shall become essential part of the contract.
12. Department reserves the right to execute Phase –1 works only and forego with the execution of Phase –2 works or execute both Phases one after the other at it’s sole wish and the parties have no right to question upon this later. Generally it is decided by the Department to carry out the Phase –1 works first and then take up the Phase –2 works. This may be changed any time at the will of the Department.
||||||||||||||||
List of Approved Makes
List of approved make for the work of Auxiliary works for implementation of RUPS system at ISAC campus, Bangalore.
Sl no
Item Make
1. Moulded case circuit breakers ABB, Siemens, Schneider, Alsthom.
2. MV Switch fuse units and Isolators
Alsthom, Siemens, L & T, GE power control, ABB, Schneider.
3. HRC fuses Alsthom, Siemens, L & T, GE power control, ABB.
4. Transformer Kirloskar, Crompton Greaves, Alstom
5. LT Current / Voltage transformer
Kappa Electricals, AE,
6. HT Current / Voltage transformer
Kappa Electricals, AE,
7. Armored power cables (LT & HT)
Universal, CCI, RPG, Nicco, INCAB
8. LT Air Circuit Breaker Siemens, GE, ABB, Schneider. 9. HT Vacuum Circuit Breakers Siemens, Alsthom, ABB,
Crompton Greaves. 10. Digital type measuring
Instruments. AE, L & T, Enercon, GE Digital,
11. Push Button and Key actuators
L & T, Siemens, Vaishnav, Siemens, Crompton Greaves, ABB.
12. Relays Brown Boveri, Siemens, GE, L&T, Alsthom.
13. End termination Kit Raychem. 14. Lugs, Glands 3 D, Dowels, Jainson. 15 Contactors Siemens, Telemechnic, L & T. 16. PVC Wires Finolex, NICCO, Anchor,
INCAB.
Note: Any other item not covered in above list but required for the work shall be of reputed makes and shall have the prior approval of Department.
mmmm