Busbar Protection
101
7SS52 V4 Manual
C53000-G1176-C182-1
Figure 5-7 TRIP following 2-out-of-2 evaluation
Figure 5-8 TRIP due to filtered value
5.1.2 Isolator Replica
The allocation of the feeders to the bus zones is automatically determined by the po-
sition of the isolators.
Only the OPEN position is evaluated for the allocation of the feeders to the busbars.
Therefore, no special demands such as adjustment are made on the isolator auxiliary
contacts. The CLOSED position is only used for the isolator status supervision (isola-
tor malfunction, isolator intermediate position).
The assignment of a coupler bay to the relevant bus zones is only carried out when at
least one isolator is activated on both sides of the coupler (left and right side of the
circuit breaker). An operational current flow is only then possible. This ensures that,
with the closing of the first isolator and a short-circuit in the coupler area, the busbar
feeding the fault is immediately tripped independent of the fault location and the cur-
rent position of the circuit breaker (CBaux).
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