How generator protections are classified in nuclear power station?

1.	How generator protections are classified in nuclear power station?
Answer» Classification of generator protection in nuclear power station. 1. MAIN ProStator E/f tection Loss of Excitation Pole slipping Differential Inter turn Unbalance current 2. Backup Protection Back up Impedance Over Voltage Under Freq Over freq. 3. STARTUP Protection Phase o/c during startup E/F during startup 4. EXCITATION Protection Excitation transformer over current Rotor E/f. and Rotor o/v 48 V DC fail more than 3 Bridge fail (¾ logic) Manual channel fails Transformer over temperature (Class –B)

Answer»

Classification of generator protection in nuclear power station.

1. MAIN ProStator

E/f tection

Loss of Excitation

Pole slipping

Differential

Inter turn

Unbalance current

2. Backup Protection

Back up Impedance

Over Voltage

Under Freq

Over freq.

3. STARTUP Protection

Phase o/c during startup

E/F during startup

4. EXCITATION Protection

Excitation transformer over current

Rotor E/f. and Rotor o/v

48 V DC fail

more than 3 Bridge fail (¾ logic)

Manual channel fails

Transformer over temperature (Class –B)

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