When a fault occurs in a high voltage transmission line, what happens first?
A. Circuit breaker operates then the relay
B. Relay operates and then the circuit breaker
C. Relay operates, then successively the isolator and the circuit breaker
D. Isolator operates, then successively the relay and the circuit breaker
Answer:B
When a fault occurs in a high voltage transmission line, what happens first?
A. Circuit breaker operates then the relay B. Relay operates and then the circuit breaker C. Relay operates, then successively the isolator and the circuit breaker D. Isolator operates, then successively the relay and the circuit breaker