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.

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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