A PRACTICAL TRANING

SEMINAR

BY:-Ramveer Olan

Sub-station is a subsidiary station of

an electricity generation,

transmission and distribution system

where voltage is transformed from high to

low or low to high voltage using

transformers.

• Sub-station should be located at load

center

• Sufficient land area

• Grounding

• Easy of maintenance

• Possibility to Expand

• Reliability and Security

• Electrical design considerations

EQUIPMENTS OF SUB STATION : • Lightning Arrester • Wave traps• Isolator• Instrument Transformers• Power Transformer• Insulator• Circuit Breaker• Power Line Carrier Communication (PLCC)

• Lightning Arrester :-

To discharge lightning over voltages and

switching over voltages to earth.

• Wave Trap:-To prevent high frequency signals from entering

other zones.

• Isolators :-

Disconnection under no-load condition for

safety, isolation and maintenance.

TYPES OF ISOLATOR•BUS ISOLATOR•LINE ISOLATOR•TRANSFORMER ISOLATING SWITCH

TRANSFORMER A TRANSFORMER IS A STATIC AC DEVICE WHICH CONVERT ELECTRIC ENREGY FROM ONE FORM TO ANOTHER

1.INSTRUMENTAL TRANSFORMER CURRENT TRANSFORMER A C.T IS USED TO STEP DOWN CURRENT FOR MEASUREMENT,CONTROL AND PROTECTION

POTENTIAL TRANSFORMER A P.T IS USED TO STEP DOWN VOLTAGE FOR MEASUREMENT, CONTROL AND PROTECTION

2.POWER TRANSFORMER 1.CORE TYPE 2.SHELL TYPE

• Current Transformer :-

To step-down currents for measurement,

control & protection.

• Power Transformer :-To step-up or step-down the voltage

and transfer power from one a.c. voltage another a.c. voltage at the same frequency.

TRANSFORMER COOLING•Natural cooling

•Oil blast cooling•Forced oil cooling•Forced air cooling

TRANSFORMER USED

•There are 5 transformer are used in grid sub station1.220/132 (i) & (ii)2.132/33 (i) & (ii)3.132/11

• Circuit Breaker :-

Automatic switching during normal or

abnormal conditions.

CIRCUIT BREAKER•Minimum oil Circuit Breaker•Air Blast Circuit Breaker•SF6 Circuit Breaker•Vacuum Circuit Breaker

POWER LINE CARRIER COMMUNICATION (PLCC)•Wave trap

•Coupling Capacitor

EARTHING•Neutral Earthing

•Electric Earthing

PLEASE SAVE

ELECTRICITY

QUERY ?