ppt on powergrid corporation of india on

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1. Protection Scheme Transformer Bus bar Transmission line Relay Types Table Of Contents 1 2

2. Relay 1

3. Basic info Detects abnormal condition. Trip signal to CB. CB opens contact.

4. Speed of operation Sensitivity Selectivity Reliability Simplicity Economical Parameter of relay

5. If current flowing through relay is greater than pickup value. Over Current Relay Types Of Over current Relay Instantaneous Definite Time IDMT Very Inverse Extremely Inverse

6. Operates if the difference between two or more similar quantity is exceeding certain level. Over current Relay Differential Relay

7. Impedance Relay Reactance Relay Mho Relay Distance Relay Directional Relay Operation of relay depends on current direction. Operates if current flows in set direction.

8. Protection Scheme 2

9. Transformer Protection Differential Protection Scheme. Restricted Earth Fault relay. Over Flux relay Busbar Protection Differential Protection Scheme. Transmission Line Protection Overcurrent Relay. Directional Relay.

10. Differential Protection of Transformer

11. Restricted Earth Fault scheme

12. Over Flux relay The magnetic flux density in windings is directly proportional to the induced voltage and inversely proportional to the frequency. Protection system operates when this ratio increases above normal level and quickly isolates the transformer by sending trip signal to circuit breaker.

13. Differential Protection Busbar

14. Thank You