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

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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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

You can also Read :
Interview Questions
MCQ or objective