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Disha Institute Of Management And Technology

PresentationOn

Vocational Training(Session 25-may-12 to 24-june-12)

Topic:- 132KV/33KV Sub-StationIn

Chhattisgarh State Power Transmission Co. Ltd.

From:Chhattisgarh State Electricity Board

(Gudhiyari, Raipur, C.G.)

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Chhattisgarh State Electricity Board(CSEB)CHHATTISGARH STATE POWER AND TRANSMISSION

COMPANY LTD(CSPTCL)

132 KV SUB-STATION

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Single Line Diagram:-

http://localhost/var/www/apps/conversion/tmp/scratch_10/Name%20of%20the%20symbols.pptx

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TRANSFORMER:

A transformer is a staticpiece of apparatus bymeans of which electricpower in one circuit istransformed into electricpower of the same

frequency in anothercircuit.

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Specification of Transformer: -

Continuous rating MVA = 32/40

Numbers of unit = Two(2 nos)

Phase = 50Hz

Frequency = 132/33 kv

Normal voltage ratio at no load = Star/Delta

Connections = nyno

Vector group = +5% to 15% of132 KV in 1.25% step

Tapping range = TypeSN /50012/350/300/16-0CRT male

Details of C.T. = (1) H.V. WTI C.T. single core ring type, 10VA ratio 205.8/1.8

class-5, fitted inside HV bushing current in 2V terminals.

(2) L.V. WTI C.T. single core ring type 10VA Ratio:- 6.99/1.8

amps class-5, fitted inside L.V. bushing current in 2V terminal.

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Cooling = ONAN/ONAF

Terminal arrangement = (1) H.V. 145KV/1250 amps, 650 BIL 300 BCT OIP

condenser bushing with arching hours. Coverage

distance:- 1300mm.

(2) L.V. 52KV/1250 amps, 250 BIL 100 BCI OIP

condensers bushing with arching hours. Creep agedistance: - 1300.

(3) H.V. N & L.V. N 52KV/1250 amps 250BIL ,

100 BCT OIP condenser bushing without arching

hours. Creep age distance:- 1300mm.

Total weight of transformer = 73500Kg

Weight/quantity of oil = 15000Kg/16900 liters (for first filling)

Untangling weight = 41000Kg (core & winding with cover)

Transport weight = 50000Kg (gas filled)

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CURRENT TRANSFORMER

Current transformers are used for

reducing or stepping down A.C.

current from higher value to lover

for measurement protection or

control

Types of Current Transformer:

1. Ring type C.T. or window type C.T

2. Mounded Resin C.T

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VOLTAGE TRANSFORMER

Voltage transformers are used for protection

and measurement. Accordingly they are

either measuring type or protective type

voltage transformers. They may be either

single or three phases. The primary of

voltage transformer is connected directly

to power circuit between phase and ground

depending upon rated voltage and

application.

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Po

werTran

sformer

Transformer is a static

electromagnetic machine

which transforms alternating

current from one A.C. voltage

at same frequency & at the

same apparent power from one

winding via common magnetic

core.

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Use And Application of Power Transformer:

GENERATION

TRANSMISSION

DISTRIBUTION

RECTIFIER PLANTS

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CIRCUITBR

EAKER:

It is an automatic devicecapable of making andbreaking an electric circuitunder normal & abnormalcondition such as shortcircuit.

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TYPES OF CIRCUIT BREAKER:

1. Air circuit-breaker miniature circuit breaker (ACB).

2. Oil circuit-breaker tank type or bulk oil (OCB).

3. Minimum oil circuit-breaker (MOCB).

4. Air blast circuit-breaker (ABCB).

5. Sulfur hexafluoride circuit-breaker (single pressure or double pressure).

6. Vacuum circuit-breaker (VCB).

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Relay:

A relay is an electrically operated switch.

Relays are used where it is necessary to

control a circuit by a low-power signal

or where several circuits must be

controlled by one signal. Relays were

used extensively in telephone

exchanges and early computers to

perform logical operations

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Isolator Isolator can be rewritten as

isolator is a manually operatedmechanical switch whichseparates a part of theelectrical power systemnormally at off load condition.

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Lightning Arrester A lightning arrester is placed

where wires enter a structure,preventing damage toelectronic instruments withinand ensuring the safety ofindividuals near them.Lightning arresters, also calledsurge protector.

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Wave Trap It is used to trapping the high

frequency communicationsignals sent on the line fromthe remote substation anddiverting them to thetelecom/teleprotection panelin the substation control room.Line trap also is known as

Wave trap

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Presented By:

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