Section 5 1MRK 505 350-UEN
Additional protection options
42 Technical Manual
Distributed busbar protection REB500
The signal 23340_BFP TRIP L0 by itself does not allow for phase
segregated tripping and will therefore normally be used for three-
phase-tripping of the circuit breaker.
When connecting phase start signals to the BFP L0 system,
functions depending on single phase tripping signals such as
autoreclosure might be bypassed by a three phase trip after
BFP L0-t
1
.
5.2.2 Configuration/ Current setting of BFP L0 system
Similar to the conventional BFP for the phase system, the BFP L0 system works
with two timer stages. To allow for independent fault clearance behavior, timer
stage t
1
-L0 is implemented as a completely separate timer, independent from the
timer stages t
1
of the BFP phase system. Timer stage t
2
is implemented as a single
timer and can be initiated after t
1
by both phase and neutral system. The simplified
block diagram can be seen in Figure 10.
The behavior of timer stage t2 is the same as for the phase-system. Remote tripping
signals can be set after the end of timers for stage t
1
or at the end of t
2
.
Figure 11 Simplified block diagram of the BFP Initiation logic
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