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Q. |
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. Relay operates and then the circuit breaker. |
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