GSS ppt

electrical engineering

1. GUIDED BY :- Mr. Deepak S omani Asst. Prof. EE PRESENTED BY:- Ravi kant Roll no . :- 12ECOEE020 A TRAINING SEMINAR ON “GRID SUB-STATION” SESSION 2015-16 Bachelor of Technology In Electrical Engineering 1

2. CONTENTS SUBSTATION. TYPES OF SUB-STATION. SINGLE LINE DIAGRAM. EQUIPMENT. Lightening Arrester. Isolator. CVT. Instrument Transformer. a. Current Transformers. b. Potential Transformers. Circuit Breaker. Bus bars. Transformer. Protective Relaying. DC Power Supply. 2

3. SUB-STATION A substation is a part of an electrical  generation , transmission and  distribution   system. Substations transform  voltage  from high to low or the reverse. Then that voltage we use in our homes and industries etc. Fig. SUB-STATION 3

4. CLASSIFICATION OF SUB-STATION ACCORDING TO SERVICE REQUIRMENT. Transformer sub-station. Switching sub-station. Power factor correction sub-station. Frequency changer sub-station. Converting sub-station . ACCORDING TO CONSTRUCTIONAL FEATURE. Indoor sub-station. Outdoor sub-station. Underground sub-station. Pole-mounted sub-station. 4

5. SINGLE LINE DIAGRAM 5

6. EQUIPMENT OF SUB-STATION Lightening Arrester. Isolator. CVT. Instrument Transformer. a. Current Transformers. b . Potential Transformers. Circuit Breaker. Bus bars. Transformer. Protective Relaying DC Power Supply 6

7. LIGHTENING ARRESTER Lightening arrestors are the instrument that are used to prevent from lightening entering the main station . It is also known as surge arrester. Fig. LIGHTENING ARRESTER 7

8. ISOLATORS The use of isolators is to off the transformer and the other instrument in the line. Isolators are used for maintenance whenever fault occur. It is manually operated. Fig. ISOLATORS 8

9. CVT(CAPACITOR VOLTAGE TRANSFORMER ) A CVT is a transformer used in GSS to step-down extra high voltage and provide low voltage either for measurement or to operate a protective relay . Fig. CAPACITOR VOLTAGE TRANSFORMER 9

10. BUSBAR BUSBAR is a term we use for a main bar or conductor carrying electric current to many connection . BUSBAR Fig. BUSBAR 10

11. INSTRUMENT TRANSFORMER Current transformers are basically used to take the readings of the currents entering in the substation. The other uses of this CT. Distance Protection. Backup Protection. Measurement. Fig. INSTRUMENT TRANSFORMER CURRENT TRANSFORMER 11

12. The potential transformer uses for Measurement and Protection. The main use of potential transformer is to measure the voltage through the B usbar. There are two main parts in it. Measurement. Protection. POTENTIAL TRANSFORMER Fig. POTENTIAL TRANSFORMER 12

13. PROTECTIVE RELAYS Relay is a device which sense the fault and send message signal to circuit breaker to trip the coil. It used for transformer protection. Fig. PROTECTIVE RELAYS 13

14. CIRCUIT BREAKER A circuit breaker is used to receive the fault message signal from the relay and trip the coil. TYPES:- AIR CIRCUIT BREAKER. OIL CIRCUIT BREAKER. VACCUM CIRCUIT BREAKER. SF6 CIRCUIT BREAKER. Fig. CIRCUIT BREAKER 14

15. TRANSFORMERS Transformer is a static device by which Transform AC electrical power from one voltage level into other level by keeping same frequency. Transformer used in GSS is called Power Transformer. Fig. TRANSFORMERS 15

16. DC POWER SUPPLY DC power supply is used for operate Circuit Breaker and control room operation . 110V dc power supply is used. Fig. DC POWER SUPPLY 16

17. GRID SUB-STATION AT A GLANCE 17

18. 18 THANK YOU