Gentlemen,
What is the practice of fail-safe design of switchgear control and relaying? To be fail-safe, shall all dry-contacts be normally closed for interlock and intertripping? Shall all CBs be tripped when control power fails?
Is there any documentation regarding fail-safe?
Thanks,
Paul2gh
What is the practice of fail-safe design of switchgear control and relaying? To be fail-safe, shall all dry-contacts be normally closed for interlock and intertripping? Shall all CBs be tripped when control power fails?
Is there any documentation regarding fail-safe?
Thanks,
Paul2gh