Q.When a fault occurs in a high voltage transmission line, first the 

  • ACircuit breaker operates then the relay
  • BRelay operates then the Circuit breaker
  • CRelay operates then successively the isolator and the Circuit breaker
  • DIsolator operates, then successively the Relay and the Circuit breaker
Correct Answer : (B)

Relay operates then the Circuit breaker

Hints :

When a fault occurs in a high voltage transmission line, first the Relay operates then the Circuit breaker.

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