89
6
F
2
S
0
8
3
4
If the OCBF continues to operate, a retrip command is given to the original breaker after the
setting time of TBF1. Unless the breaker fails, the OCBF is reset by retrip. TBF2 does not time-out
and the BFP is reset. This sequence of events may happen if the BFP is initiated by mistake and
unnecessary tripping of the original breaker is unavoidable.
If the original breaker fails, retrip has no effect and the OCBF continues operating and the TBF2
finally picks up. A trip command CBF-TRIP is given to the adjacent breakers and the BFP is
completed.
Fault
CBF
-
TRIP
TBF2
RETRIP
TBF1
OCBF
Original
breaker
Adjacent
breakers
TRIP
Retrip
Toc
Toc
Tcb
T cb
TBF1
TBF2
Normal trip
Trip
Open
Closed
Start BFP
Open
Open
Closed
Tcb: operating time of the original breaker
Toc: reset time of the overcurrent element OCBF
Figure 2.4.12.2 Sequence Diagram
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