ABB Network Partner AB
Breaker-failure protection
Version 1.0-00
1MRK 580 171-XEN
Page 5 - 84
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 correct timing at an evolving fault
• Accurate timers and current elements reset in 10 ms, allowing the
use of short back-up trip time
Fig. 2 Time sequence
(X80171-2)
40ms
20ms
<10ms
40ms
20ms
<10ms
30ms
Relay
time
Start BFP
Normal
CB opening
CB opening time
Marginal
BFP
time
CB opening time
Marginal
BFP
time
110ms
Retrip
original CB
150ms
General trip
adjacent CB
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