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balaji gsn
09-25-2013 11:10 PM

Circuit breaker failure protection

what is circuit breaker failure protection?  what is the exact use of?
09-26-2013 01:48 AM
Top #2
Raymond Lee
09-26-2013 01:48 AM
Breaker failure protection is local back-up protection. Breaker failure is initiated via protection, when the trop pulse is sent to the breaker for fault interruptin / clearing.

It is a fixed time delay relay which monitor either the breaker "a" contact or the current through the breaker to determine if the breaker has successfully interruptrd the fault current. If the BF times out, it sends a trip pulse to the adjacent protection zones and uses the other zone tripping breaker to clear the flt
09-26-2013 04:27 AM
Top #3
Eric Stark
09-26-2013 04:27 AM
Modern relays will have the ability to detect a failure in the CB and alarm/trip control centers and coordinated tripping.
BF flag can be initiated due to fixed timing (which is the least desirable), extensive arcing after trip/open, re-striking after close, single phasing and more.
The CB condition must be known for the protection to operate right when called upon

Hope it helped,
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