Technical Data
308
7SS52 V4 Manual
C53000-G1176-C182-1
9.2.10 Circuit Breaker Failure Protection
Control modes One or two-channel initiation
Modes of operation Individually selectable per feeder:
− I>query
− TRIP repeat (1/3-phase) with
I>query
− Unbalancing (1-stage CBF)
− Unbalancing with TRIP repeat
(1-/3-phase, 2-stage CBF)
− TRIP by external CBF
protection (tripping via isolator
replica of busbar protection)
− plus for each mode
(except for TRIP by external
CBF):
low-current mode
− plus for modes with
TRIP repeat:
pulse mode
Setting ranges Overcurrent I / I
N
0.10 to 2.00 (in steps of 0.01)
0.05 to 2.00 (Earthfault characteristic)
Stabilizing factor k 0.05 to 0.80 (in steps of 0.01)
Time delay for
unbalancing / I>query 0.05 to 10.00 s (in steps of 0.01)
Time delay for
TRIP repeat 0.00 to 10.00 s (in steps of 0.01)
Drop-off times Mode “unbalancing” Approx. 2 ms
Mode “I>query” Approx.25 ms
Definite time (backup protection) Approx.25 ms
Tolerances Current 5 % of setting value or 50 mA
k factor 5 % of setting value
Time 5 % of setting value or 50 ms
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