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TEST
Block BFP=Yes
TEST-ACTIVE
BFP-BLOCK
STIL1
BFP-START
STIL2
RETRIP=I>Check
RETRIP=No I>Check
124
Breaker failure protection (BFP)
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≥1
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The application functions of the protection are:
•
Individual phase-current detection
•
Two time steps, one for retrip of the related circuit breaker and one for the back-up
trip of the adjacent circuit breakers
•
Selection of current controlled or unconditional retrip
•
Phase separated timers gives correct operation at an evolving fault
•
Accurate timers and current elements reset in 10 ms, allowing the use of short back-
up trip time
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t1
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t
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t2
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tp
≥1
BFP-TRBU
tp
≥1
BFP-TRRET
tp
t1
t
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