Sequence of questions during opening and closing of a substation circuit?

DWQA QuestionsCategory: (EE) Power SystemSequence of questions during opening and closing of a substation circuit?
How Engineering Works Staff asked 7 years ago
2 Answers
How Engineering Works Staff answered 7 years ago

Answer: Sequence of operations of circuit breaker, isolator and earthing switch during opening and closing of a circuits are given below

While opening:  Open Circuit Breaker, Open isolator and then Close Earthing Switch if provided.

While closing: Open switch, Close isolator and then Closed Circuit Breaker.

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How Engineering Works Staff answered 6 years ago

For switching off-
Open the Circuit breaker >  Disconnect isolator >  Engage earth switch > Lock & Tag

For switching on –
Remove Tag & Lock  > Disengage earth switch >  Connect isolator > Close circuit breaker

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