Micom P631, Technical Manual

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t
MAIN:
General starting
[ 036 000 ]
CBF_1:
Starting trig. EXT
[ 038 016 ]
CBF_1:
Trip signal
[ 040 026 ]
CBF_1:
Starting
[ 038 021 ]
CBF_1:
Delay/starting trig.
[ 022 155 ]
0
64Z1107B
&
Fig. 3-133: Starting trigger
3.27.12 Fault Behind CB Protection
A fault behind a CB (downstream) is a fault that may occur between a circuit
breaker already open and a CT, which is fed from the remote end.
Fault behind CB protection recognizes such faults through the current criterion, if
the circuit breaker does not provide a signal from its auxiliary contacts that it is
closed after the time delay set at CBF_1: Delay/fault beh. CB has elapsed.
When such a fault behind CB is recognized the signal CBF_1: Fault behind CB
is issued. In such a case the far end circuit breaker may be triggered by an
InterMiCOM teleprotection interface. This may also prevent an unwanted
triggering of the circuit breaker failure function.
19Z6136D
CBF_1:
Fault behind CB
[ 038 225 ]
&
CBF_1:
Delay/fault beh. CB
[ 022 171 ]
CBF_1:
I<
[ 022 160 ]
CBF_1:
CB pos. implausible
[ 038 210 ]
MAIN:
CB1 open 3p EXT
[ 031 028 ]
MAIN:
CB1 closed 3p EXT
[ 036 051 ]
I ̲ A
t 0
I ̲ B
I ̲ C
&
Fig. 3-134: Fault behind CB protection
3.27.13 CB Synchronization Supervision
CB synchronization supervision recognizes states where not all circuit breaker
contacts are open or closed. This function uses both current flow monitoring and
evaluation of CB status signals to detect CB synchronization. In order to bridge
CB operate times the time delay CBF_1: Delay/CB sync.superv can be used.
When this time delay has elapsed the signal CBF_1: TripSig CBsync.super is
issued. Poles that are recognized as being ‘open’ will still be signaled.
3 Operation
P631
P631/EN M/R-11-C // P631-310-650 3-165