draft 11kv spec oil

7/28/2019 Draft 11KV Spec OIL

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TECHNICAL SPECIFCATIONS

FOR 11KV VACUUM CIRCUIT BREAKER HT

PANEL

TECHNICAL SPECIFCATIONS

FOR 11KV VACUUM CIRCUIT BREAKER HT

PANEL

Draft Specification

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1.0.0 GENERAL

1.0.1 This specification covers design, fabrication, testing, packing, and supply of

11KV, H.T. indoor, freestanding, drawout type metal clad switchgear of 11kV

trolley mounted vacuum circuit breakers. The switchboards shall be new which

specifically produced against this order.

1.0.2 Reliability of equipment and ease of maintenance without hazards to operation

and maintenance personnel are of utmost importance. The workmanship shalbe of highest grade and the entire construction in accordance with the best

modern practice. The equipment shall be capable of continuous and reliable

trouble free operation at full load ratings.

1.0.3 The design and construction of vacuum circuit breakers, bus bars and other

components shall meet the requirements of severe fault levels. Protective

devices and control components shall meet the standard design and the

system requirements.

1.0.4 The design and construction shall be capable of with standing the severest stress

likely to occur in actual service and of resisting rough handling during

shipment. All similar materials and parts of similar equipment shall be inter-

changeable with each other. The boards shall be fitted with the same family of

vacuum circuit breakers and other components of various rating with a view to

ensure uniformity of design and ease in maintenance and replacement of

spares. The fabrication and arrangement of the switchboard shall be such thatit can be extended on both sides at a future date.

1.0.5 The manufacturer of the switchgear has to be the manufacturer of Interrupter.

1.1.0 CODES AND STANDARDS:

1.1.1 The Switchboard shall conform to latest editions of the following Indian

Standards:

a) IS: 13118 Alternating current circuit breakers.

b) IS : 4710 Switches and switch isolators above 1.0 kV but

not exceeding 11 kV.

c) IS : 370 Marking and arrangement of switchgear bus

barsd) IS : 2705 (P-I TO IV) Current transformers

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e) IS : 3156 Voltage transformers

f) IS : 1248 Electrical indicating instruments

g) IS : 2208 HRC cartridge Fuse link upto 650 V

h) IS : 694 PVC insulated power cables (for voltage upto

1100 V) with copper conductors.

i) IS : 3427 Degree of protection provided for metal enclosed

switchgear and control gear.

j) IS : 3231 Electrical relays for power system protection.

k) IS : 6875 Control switches and push buttons.

l) IS : 5578 Guide for marking of insulated conductors.

m) IS : 772 Integrated meters

n) IS : 5082 Materials for data for aluminium busbars

o) IS : 3618 Phosphate treatment of iron and steel forprotection against corrosion.

p) IS : 6005 Code of practice of phosphating of iron and

steel.

q) IEC:62271-100 High voltage alternating current circuit breakers

r) IEC:62271-200 AC metal enclosed switchgear and control gear

for rated voltage above 1 kV upto 52 kV.

1.2.0 SYSTEM:

The Switchboards shall be suitable for the following system:

a) Rated voltage 11 kV + 10%

b) Fault level 25/31.5 KA for 1Sec

c) Bus bars Adequate capacity Electrolytic grade

Copper bus bars with uniform cross

section, Heat shrinkable PVC sleeved.

d) Operating

frequency

50 Hz + 3%

e) No. of phases 3

f) Control and 110V DC for Control & Protection and 230V

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auxiliary supply single phase for space heater, spring

charge motor etc. Control supply shall be

fed from the battery bank to be supplied bythe Owner.

1.3.0 SITE CONDITIONS:

a) Altitude Less than 1000 M above MSL

b) Temperature range +4 C to + 42C

c) Humidity 90% (max)

d) Average ambient temperature 35C

e) Environment Highly corrosive

f) Design Ambient Temperature 40C

g) Temperature Rise Allowed As per IEC:60694, Table - 3

1.4.0 GENERAL REQUIREMENTS:

1.4.1 Switchgear shall be suitable for indoor installation, metal clad, drawout type and

shall comprise standard prefabricated, cold rolled sheet steel units, assembled

to form a rigid free standing dead front structure. All front doors shall be

hinged type. Rear doors shall be with bolted construction and consists of 3sections with inspection window, interlocked in such a way that the lower

section can be opened only when the upper one is opened and thus

inadvertent access to live parts is avoided. Vertical units Panels shall be

assembled to form a continuous line up of uniform height

1.4.2 The cubicles shall be totally enclosed and vermin proof design. If necessary,

opening for natural ventilation shall be provided in the busbars chamber with

uniformly distributed louvers backed up by G.I. wire mesh for protectionagainst entry of insects etc. Thickness of the sheet steel shall be minimum 2.0

mm for front and rear doors & for pressure discharge flaps 1.6 mm. The

enclosure protection shall be IP 4X as per IEC: 62271-200.

1.4.3 Doors and openings shall be provided with high life cross-linked polyuretherene

gaskets. All doors shall be key operated & hinged type.

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1.4.4 Switchboards shall be suitable for operating in tropical climate and under the

ambient conditions as specified.

1.4.5 Compartments for cable connections shall be separate and allow cable pulling,

termination and connection work with switchgear energized.

1.4.6 Adequate barrier shall permit personnel to work safely within an empty

compartment with the bus bars energized.

1.4.7 The design shall be such as to allow extension on both sides, i.e. to provide

additional two outgoing switchgear panels complete with all accessories and

fittings, if required in future. Ends of bus bars shall be suitably drilled for this

purpose. Panels at extreme ends shall have openings, which shall be covered

with plate screwed at panel.

1.4.8 The drawout carriage in the switchboard for all breakers shall have threepositions viz., Service, Test and Drawout. Automatic Metallic safety shutter

shall be provided to ensure the inaccessibility of all live parts after the breakeris drawn out. It shall not be possible to drawout the carriage with circuit

breaker closed.

The breaker, shall remain outside the cubicle in the drawnout position.

1.4.9 Suitable interlocks shall be provided to prevent faulty operation such as:

- Plugging in or drawing out of a closed breaker.

- Pulling out of auxiliary circuit plug with breaker in service position.

- Pushing in breaker to service position with auxiliary circuit plug not in

position.

1.4.10 ACCESSIBILITY

All the components in the Switch board panels shall be mounted in such a way

that checking and removal of components shall be possible without disturbing

that checking and removal of components shall be possible without disturbing

adjacent components. All auxiliary equipments shall be easily accessible and

visible from front side with their name plate details. It shall be possible to set

all measuring relays in situ without de-energizing the switchboard. Al

mounted equipments and associated components shall have identification tags

of permanent nature at front and at the rear also.

1.4.11 Unused C.T. secondary terminals shall be short circuited. All terminals shall beshrouded with plastic covers to prevent accidental contact.

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1.4.12 BUSBARS

1.4.12.1 The swichboard shall comprise of 3 phase busbars, which shall extend through

all panels of the switchboard. All phase busbars shall be of uniform cross

section throughout the switchgear board and shall be suitably sized to carry

continuously the required current. Busbars shall be housed in a separate

chamber and shall be accessible for inspection only with specified tools.

Busbars shall be of HDHC electrolytic grade Copper and shall be insulated

with black coloured heatshrinkable PVC sleeves throughout their length

Phase identification shall be marked with HT coloured tape at regular interval.

All joints shall be covered with good quality HT tape and monoplast

compound.

Busbars shall be supported at regular intervals and both, busbars and the

supports shall be adequately size and braced to withstand the specified shortcircuit level without permanent deformation. Dynamic stress shall be

calculated on the basis of the specified peak short circuit. All busbar supports

shall be of non-carbonizing material resistant to acids and alkalis and shall

have non-hygroscopic characteristics such as SMC, DMC epoxy bonded

fibreglass.

1.4.13 DRAWOUT COMPARTMENTS:

All circuit breakers shall be fully drawout type and Truck mounted. Cassettemounted breaker is not acceptable. The connections on the bus side, outgoing

and control circuits shall be through drawout contacts so that the breaker can

be drawn out without disturbing any wiring. The current transformers for themetering and protection circuits shall preferably be mounted on the fixed

portion of the circuit breakers.

The circuit breaker mobile portion shall get earthed automatically as soon as

the same is inserted into the fixed compartment, irrespective of its position in

the compartment.

It shall not be possible to rack in or drawout a breaker in service position whenthe same is in closed position.

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1.4.14 POWER CONNECTION

The incoming and outgoing power connections shall be through XLPE insulated

aluminium conductor cables of suitable size. Ample space for connection of

cables Cupal washers shall be used for all copper to aluminium joints.

The switchboard shall be supplied complete with supports for clamping

outgoing and incoming cables. Terminal blocks shall not be used to support

cables.

1.4.15 AUXILIARY WIRING AND TERMINALS:

Inside the panels, the wiring for control, signaling, protection and instruments

circuits shall be done with PVC insulated copper conductors. The insulation

grade shall be 1100 V. The wiring shall be enclosed in plastic channels or

neatly bunched together.

10% spare terminals shall be provided on each terminal block. Conductors

shall be terminated with adequately sized compression type lugs forconnection to terminal strips of Elmex / Tosha/ Essen / Connectwell makes

only. All auxiliary equipment termination shall be made with pressure type

terminals. Sufficient terminals shall be provided on each terminal block to

ensure that not more than one outgoing wire is connected per terminals.

Terminal strips shall preferably be separated from Power circuits by meta

barriers or enclosures.

Each auxiliary circuit wire shall be identified at both ends by PVC ferrules.

Shorting links shall be provided for all C.T. terminals.

For CT circuits PVC insulated 2.5 mm2

copper conductor cables shall be usedOther wiring shall be carried out with PVC insulated 1.5 mm2 copper

conductor cables.

Supporting facilities shall be provided for clamping the control cables.

All auxiliary circuits shall be protected by HRC fuses / MCB bearing

identification labels. All control fuses shall be of link type in fuse carries and

shall have operation indicators.

1.4.16 CONTROL AND INDICATION:

All controls, critical indications, annunciations of Switchboard shall be on 110 VD.C., Breaker position (ON/OFF/spring charged/ test position/ service position)

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shall be indicated. Electrical indications with colours as given below shall be

provided:

Breaker ON - Red lamp

Breaker OF - Green lamp

Breaker Auto trip - Amber lamp

Trip ckt healthy - White lamp

DC fails - Blue lamp

1.4.17 EARTHING ARRANGEMENTS:

All cubicles shall be connected to an earth busbar running throughout the

length of the switchboard. The earth bus size shall be 50x6 m copper. Al

doors and moveable parts shall be connected to the earth bus with flexible

copper connections. Provision shall be made to connect the earthing busbar to

the plant earthing grid at two ends. All non-current carrying metallic parts ofthe switchboard shall be earthed. Earth bus shall be brought back to cable

compartments and earthing bolts shall be provided to ground cable armours.Mating surfaces of all bolted parts shall be specially zinc passivated to ensure

continuity between them.

1.4.18 NAME PLATE

a) Nameplates of approved design shall be provided at the top of the panel to

represent switchgear designation. A separate nameplate giving details shal

be provided at front and rear end of each panel also.

b) Identification / Name plate shall be provided for each equipment (lamps,

Push buttons, switches, relays, auxiliary contactor, indicating instrumentetc.,) mounted on the panels. Special warning plates shall be provided on

all removal covers or doors giving access to high voltage cable

terminations/ bus bars. Special warning label shall be provided inside thepanels also wherever considered necessary.

Engraved Panel name plates shall preferably be of 3 ply (Black-White-Black)

laminated sheets or anodised aluminium. Name plates shall be fastened by

counter sunk screws and not by adhesive.

1.4.19 SURFACE TREATMENT AND PAINTING:

Switchboard shall be powder coated (epoxy based) with a paint shade LightGrey RAL 7032 as per DIN.

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The switchboard shall be free from imperfections like pinholes, orange peels,

run off paint etc. All unpainted steel parts shall be cadmium plated or suitably

treated to prevent any rust.

1.4.20 SPACE HEATERS:

Each cubicle shall be provided with a space heater to prevent moisturecondensation and maintain cubicle temperature at 5C above the ambient. The

space heater shall be located at the bottom of each panel of switchboard and

shall be controlled through a thermostat with an adjustable setting and a

manually operated switch and with miniature circuit breaker of suitable rating

for circuit protection. Switchboard space heater supply of 230 V A.C. for each

switchgear panel shall be given at one point for each section. 230 V A.C.

control wire bus with loop-in loop-out method shall also run along the

switchboard for feeding space heaters.

1.5.0 POWER CIRCUIT BREAKER (VACUUM CIRCUIT BREAKER):

1.5.1 Power circuit breaker shall be triple pole, vacuum type, spring closed, horizonta

draw out & horizontal isolation type breaker with transport truck rated 11KV

having symmetrical breaking capacity of minimum as per cl. 1.3.0 andequipped with auto spring charging motor working on 230 V, 50 Hz. Single

phase, AC and a closing coil suitable for 110 V D.C. it shall be possible to

charge the spring manually, if, required. The breaker drawout carriage shall be

so designed and constructed as to permit the smooth withdrawal and insertion

of the breaker into it. The movement shall be free of jerks and easy tooperate.

1.5.2 ON and OFF switches/ push buttons shall be mounted on the front door of eachpanel so as to operate the breaker manually (by removing one fiber glass

sheet on panel front door) or electrically. The closing time and tripping time of

breaker shall be independent of the speed of the operating handle.

1.5.3 The breaker shall be provided with an auxiliary relay to achieve the antipumping

function. This is to ensure that when closing on a fault, it does not reclose

after tripping even if the closing input is maintained.

1.5.4 If the breaker is in closed position, a closing operation of an initiating contro

device shall not result in further operation of the breaker closing mechanism.

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1.5.5 The breaker shall have following interlocking mechanism.

i) Breaker can be operated electrically only when it is either in service

or in test position.

ii) Withdrawal of breaker from operating position is possible only when

the breaker is in OFF position. Also the breaker cannot be inserted in

ON position.

iii) In the operating position the breaker shall be securely housed and

locked. It can be withdrawn or inserted only with appropriateoperation of the interlocking levers.

1.5.6 Vacuum circuit breaker shall be provided with at least 4 N.O. and 4 N.C. auxiliary

contacts. For requirements of extra space contacts an auxiliary contactor shal

be used to multiply the auxiliary contacts of the breakers. All the contacts shall

be wired to the terminal blocks and shall be so located as to allow free access.The control circuit shall be suitable for local as well as remote control. Auxiliary

contacts and limit switches shall be in dust tight enclosures.

1.5.7 Mechanical trip push buttons shall be provided for all breakers for emergency

tripping.

1.5.8 For all motor feeders only ZnO type surge suppressors shall be provided.

1.5.9 Circuit Breaker / Panel have to be tested for IEC: 62271-100 and for Capacitor

duty switching. Bidder to submit test report not older than 5-years.

1.6.0 INSTRUMENT TRANSFORMERS:

Current Transformer (CTs) and Potential Transformers (PTs) shall be cast resininsulated. Primary and secondary terminals shall be marked with good quality

PVC stickers.

1.6.1 CURRENT TRANSFORMERS

Current Transformers shall generally conform to IS 2705. They shall be

mounted on the switchgear stationary part. The CT shall be of suitable rating

& burden required for individual feeders. The neutral side of the current

transformers shall normally be earthed through a link. Unused CT secondaryterminals shall be short-circuited with the shorting link.

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All CTs shall be capable of withstanding the minimum primary fault current as

per the respective breaker capacities.

1.6.2 POTENTIAL TRANSFORMERS

The Potential transformers shall be drawout type and provided with secondary

fuses. The primary connection shall be disconnected before PT become

accessible. The potential transformer shall be mounted on a drawout carriagecomplete with fuses, on top of the Panel or in a separate cubicle. Breaker

mounted PT is not acceptable.

All the Incomers shall be provided with Line Connected PT.

1.7.0 MEASURING INSTRUMENTS:

All measuring instruments shall be of square pattern 96 mm x 96 mm (min.)

flush mounted on front hinged door of instrument compartment of a panel. Allauxiliary equipment such as shunt, CTs, PTs etc. that are required shall be

included in the supply of the switchboard.

1.7.1 AMMETERS AND VOLTMETERS

These shall be of Digital Three (3) Phase type with In-built selector switch. The

accuracy class shall be 1.0 as per IS: 1248.

1.7.2 MULTI-FUNCTION METERS:

The Digital non-communicable Multi-function meters shall be flush mounted,

preferably in a non-draw out case. It shall be suitable for operation on 3 phase3 wire unbalanced load. It shall have atleast A, V, PF, F, KW, KWh, Run Hours,

ON hours measurement functions. The accuracy class shall be 1.0 as per IEC:

62052-11.

1.8.0 AUXILIARY EQUIPMENT:

Auxiliary relays / contractors shall generally be used for interlocking &

multiplying contacts. Auxiliary contacts shall be capable of carrying the

maximum estimated current. In any case their rating must not be less than 5Watt for 230 V AC.

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1.8.1 TRIPPING RELAYS:

All tripping relays shall be lockout type with hand reset contacts and shall be

suitable to operate on the specific D.C Voltage. These relays shall have coi

cut-off contacts and shall be provided with hand reset operation indicators.

The tripping relays shall be non-drawout type.

1.8.2 PROTECTIVE RELAYS

All relays shall be back-connected draw out / semi-draw out type suitable for

flush mounting. All relays shall be mounted in front of the panel and shall be

as specified in details of the equipment.

1.8.2.1 NUMERICAL RELAYS

The numerical relays shall be fitted with RS485 rear port for seria

communication to substation automation system. The relay shall contain allthe components needed for acquisition and evaluation of measured values,

data transmission, display and input & evaluation of binary signals. Al

Numerical relays including Motor Protection relays shall be provided with

RS485 interface with Modbus / IEC-103 communication protocol.

Cable Differential protection relay can be work on either Low Impedance or HighImpedance principle.

Cable Differential protection relay for the cable run more than 500m should be

capable of flush mounting and provided with the test switch for the necessary

testing facility. The relay should be provided with the direct fiber opticcommunication. It should have 4-User configurable LEDs with minimum 4:DI and

8:DO. The relay should also have front RS 232 communication and Disturbance

recording facility with the recording facility upto 5records, with the maximumrecording time of 15s.

1.8.3 FUSES / MCBS

All control fuses shall be of HRC link type conforming to IS 2208. Rewireable

fuses shall not be accepted. All fuses shall be readily accessible for

replacement. Fuses shall have operation indicator, which will be visible without

removal of fuses from the service from its carrier. Fuses shall generally be

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mounted on the upper half of the panels. All fuses and links shall be provided

with suitable labels.

Instead of Fuses, suitable rating of MCBs can be provided.

1.8.4 PUSH BUTTONS:

Push buttons colours shall be as follows:

Stop, Open, Emergency Red

Start close Green

Trip circuit Healthy check - Black

1.8.5 INDICATING LAMPS:

All indicating lamps on A.C. / D.C. supply shall be low power consumption

indicating lamps and non-breakable translucent colored (as specified) coversThe lamp rating shall be 6.0 V and 0.75 Watt.

1.8.6 CONTROL SWITCHES:

All control switches shall be rotary back-connected types, having a cam

operated contact mechanism. Preferably, phosphor bronze contacts shall be

used on the control switches. Unless otherwise stated circuit breaker controlswitches shall be 3 positions spring return to neutral from both ON and OFF

positions. They shall have pistol grip handle. Number of ways, locking system

etc. shall be as per requirement and OWNERs approved relevant drawings.

Two spare ways shall be provided on these switches.

1.8.7 CABLE COMPARTMENT

Provision shall be made for terminating 11 kV XLPE cables of suitable size.

gland plate with cable support clamps shall be supplied along with the

switchboards. Various cable sizes shall be firmed up during the drawing

approval stage.

1.9.0 INSPECTION & TESTING

Fully assembled switchboard shall be subjected to inspection by owner and by

an agency authorized by the owner at the manufacturers works. The

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inspection call notice shall be given at least 3 (three) weeks before the date of

inspection.

1.9.1 Routine test shall be carried out at manufacturers works under his care and

expense. All routine tests as per IS 13118 (1991) shall be carried out at the

manufacturers works.

1.9.2 Acceptance test shall be carried out as follows:

i) A general visual check shall be carried out. This shall cover measurement

of overall dimensions, locations, number and type of devices, termina

boxes, location and connection of terminals etc.

ii) Manual & electrical operation of circuit breaker shall be checked under

the worst conditions of auxiliary supply voltage.

iii) Dry insulation test with power frequency voltage shall be conducted for

the main and auxiliary circuits shall be checked.

iv) Insulation resistance of the main and auxiliary circuits shall be checked.

v) Operation check shall be carried out for every control function as per the

approved schematic diagrams by manually simulating fault conditions

and operation of control switches/ relays etc.

1.9.3 For equipment bought from other sub-suppliers certified test reports of test

carried out at the manufacturers works shall be submitted. All routine test as

specified in the relevant standards shall be conducted by the sub-suppliers at

his works.

1.9.4 For equipment bought from other sub-suppliers certified test reports of testcarried out at the manufacturers works shall be submitted. All routine tests as

specified in the relevant standards shall be conducted by the sub-supplier at

his works.

1.9.5 Six sets of the inspection report shall be submitted to the owner for obtaining

despatch clearance.

1.10.0 AUDIO ANNUNCIATION

a. Vendor shall include audio alarm by means of Hooter as required for

maintenance of the system but not be limited to the following.

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1.12.0 PACKING & FORWARDING

The switchboard supplied shall be transported to site with proper packing.

They shall be wrapped with polythene sheets before placing in the crates

card-board to prevent damage to the finish. Wooden platform at bottom

should be suitable for handling. Proper care should be taken while packing to

avoid ingress of moisture. Packing list shall be supplied along with the

material.

1.13.0 GUARANTEE

The switchboard and other equipment supplied shall be guaranteed for trouble

free operation for a period of 12 months from the date of commissioning or 18

months from the date of supply whichever is earlier. Any defects discovered

during this period shall be rectified by the supplier free of charge.

1.14.0 SWITCH BOARD DETAILS:

The HT Switchboard shall comprise of:

SNo. HT SWBD Number of

Panel

1. 11 KV, 10 Panel Switchboard (31.5 kA for 3

secs.) consisting of:-

1) 2 Nos. INCOMERS 1200 Amps VCB with

Directional relay & cable differentialProtection (AREVA MAKE MICOM P521) (CT suitablefor 10 MW Load)

(2) 2 Nos. 1200 Amps VCB out going feeders with

non directional relay ( MICOM P122) for ring

system (CT suitable for 10 MW Load)

(3) 630 amps for 500KVA transformer with non

directional relay (AREVA MAKE MICOM P122)

(4) 630 Amps - 2nos for Medical & D+107

substation with non directional relay (AREVA MAKE

MICOM P122)

Ten (10)

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(5) 1200Amps for Bus coupler with synchronizing

relay (AREVA MAKE relay type SKD 11)

(6) 1200Amps VCB -1No spare with with non


(7) 630 Amps VCB -1no spare with non directional

relay( AREVA MAKE MICOM 122)

(8). 2 Nos. Bus Connected PT To be mounted at

the top of outgoing panel.

2. 11 KV, 5 Panel Switchboard (25 kA for 3 secs.)consisting of:-

(1) 1 No. INCOMER 800 Amps VCB with Non-

Directional relay (AREVA MAKE MICOM P127)

(2) 630 amps for 1000 KVA transformer with nondirectional relay( AREVA MAKE MICOM P122)

(3) 630 Amps - for overhead line with non


(4) 630 Amps - spare with non directional relay

( AREVA MAKE MICOM P122)

Five(05)

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EQUIPMENT DETAILS Annexure-1

Sl.

No.

Description of feeders Incomer Outgoing

1. a. Vacuum circuit breaker complete with allaccessories as mentioned in thespecifications.

1 1

b. Single busbar arrangement Yes Yes

c. Bolted Sheet Steel Enclosure Yes Yes

4. RELAYS:

i) Cable Differential protection relay

type MICOM 521 of Areva Make of

equivalent make of ABB/Siemens.

ii) Over current , SC Earth fault, Voltageprotection relay type MICOM P127 of

Areva make or equivalent model of

ABB/Siemens (50, 51, 50N, 51N, 67,

37, 46, 81, 27, 2, 59, 95)

iii) Over current , SC Earth fault, Voltage

protection relay type MICOM P122 ofAreva make or equivalent model of

ABB/Siemens (50, 51, 50N, 51N, 37,

46,49, 95, 50 BF)

1 ( For Ten

panel SWBD)

1

0

0

0

1

iv) Lock out relay type - VAJH13 Or

equivalent ABB/Siemens make

Operating volt : 110 V DC

Note: The Buscoupler panel shall be

provided with Areva make relay type

SKD 11 for check synchronising.

1 1

5. CURRENT TRANSFORMER

EPOXY RESIN CAST CTS WITH>STR 31.5 KA for 1 sec. For 10 panelSWBD

3 3

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Sl.

No.


>STR- 25 KA for 1 sec for 5 panel SWBD.

BURDEN 10 VA

CLASS 1.0 (Metering ) &

5 P10 (Protection)

6. POTENTIAL TRANSFORMER

EPOXY RESIN CAST 3 PHASE PT (DRAWOUT

TYPE) WITH:

BURDEN 50 VA / Phase

CLASS 1 / 3P

RATIO 11000/3 / 110/3 V

1 0

7. MEASURING INSTRUMENTSi) Digital Ammeter

1 1

ii) Digital Voltmeter 1 0

iii) Multi Function meter 1 1

6. Power pack with battery backup 30

minutes

1 0

7. ACCESSORIES

i) TNC switch 1 1

ii) Emergency trip push button 1 1iii) Space heater with thermostat 230

V, 80W1 1

iv) Indicating lamps:

a) RED

b) GREEN

c) AMBER

d) WHITE

e) BLUE

1

1

1

1

1

1

1

1

1

1

v) Cable Termination : Suitable for the

following size of 11kV, XLPE, Al.

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Draft Specification

Sl.

No.


Conductor cables

a) 2# 3 C X 240 mm2 1 1

DATA SHEET ANNEXURE-2

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Draft Specification

1. System parameters

i) Design Ambient temperature

ii) Rated voltage

iii) Rated frequency

iv) Neutral system

v) Fault level

40C

11KV + 10%

50 Hz + 3 Hz

Solidly grounded

25/31.5 KA

2. Control Supply

i) Closing, tripping, indication,

auxiliary relays.

ii) Panel space heater

iii) Meters

iv) Spring charging motor

110 V DC

230 V AC

110 V DC

230 V AC

3. Vacuum circuit Breakeri) Make

ii) Type

iii) Whether drawable

iv) VCB mechanism

v) Closing

vi) Tripping

vii) Breaking capacity

viii) Short time ratingix) Basic insulation level

x) Rated current

xi) Operating duty

xii) Rating of the spring charging motor

SIEMENS/ AREVA /ABB

HWX

DRAWOUT TYPE

Motor charged spring closing

110 V DC

110 V DC

25 KA

25 KA for 1 sec75 KVp

1200A/630 A

O - 3 min -CO-3 min-CO

250 W, 230 V AC

4. CURRENT TRANSFORMER EPOXY RESIN CAST CTS WITH

>STR 31.5 KA for 1 sec. For

10 panel SWBD

>STR- 25 KA for 1 sec for 5panel SWBD.

BURDEN 10 VA

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Draft Specification

CLASS 1.0 (Metering ) &

5 P10 (Protection)

5. POTENTIAL TRANSFORMER EPOXY RESIN CAST 3 PHASE PT

(DRAWOUT TYPE) WITH:

BURDEN 50 VA / Phase

CLASS 1 / 3P

RATIO 11000/3 / 110/3 V

6. Main Horizontal Bus Bars

i) Current rating

ii) Temperature rise limit

iii) Material of bus bar

As per IEC:60694

HDHC Electrolytic grade copper

7. EARTH BUS

i) Size

ii) Material

50mmx 6mm

Copper

8. Miscellaneuos

i) Maximum panel dimensions

Width

Depth

Height

Sheet steel thickness

Weight

660 mm

1950 mm w/o rear extension

chamber

2430 mm

2.0 mm - Load bearing

2.0 mm Non - load bearing

650 Kg (approx)

ii) Whether switch board dust & vermin

proof.

Shall be dust & vermin proof.

iii) Switch board protection class IP 4X

iv) Switch board auxiliary wiring details Wiring shall be done with multi

stranded copper conductor size2.5 sq. mm., PVC insulated, 650

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Draft Specification

V grade cable.

v) Method of cable earthing Not Required

vi) Location of relay Flush mounted at the front.

Page 23 of 23

draft 11kv spec oil

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