CBF_1:
Trip signal t1
[ 038 215 ]
CBF_1:
Trip command t1
[ 038 220 ]
MAIN:
Latch. trip c. reset
[ 040 139 ]
CBF_1:
Min.dur. trip cmd.t1
[ 022 167 ]
1
1
1
S
R
MAIN:
Trip cmd. blocked
[ 021 013 ]
CBF_1:
Latching trip cmd.t1
[ 022 169 ]
0
1
0: No
1: Yes
CBF_1:
Trip signal t2
[ 038 219 ]
CBF_1:
Trip command t2
[ 038 224 ]
t 0
CBF_1:
Min.dur. trip cmd.t2
[ 022 168 ]
1
1
1
S
R
CBF_1:
Latching trip cmd.t2
[ 022 170 ]
0
1
0: No
1: Yes
64Z1106B
≥1
≥1
≥1
≥1
t 0
Fig. 3-165: Trip commands, issued by the CB failure protection
3.31.11 Starting Trigger
Should a downstream CB fail, a trip can be issued by the CB failure protection
function. In this case the dedicated general interrogation is checked as a
condition so as to guarantee increased security against overreaction.
The signal CBF_1: Starting will be issued when the signal CBF_1: Starting
trig. EXT is presented to an appropriately configured binary signal input and a
general starting is present. The signal CBF_1: Trip signal will be issued after
timer stage CBF_1: Delay/starting trig. has elapsed.
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. 3-166: Starting trigger
3.31.12 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.
3 Operation
P634
P634/EN M/R-42-A // P634‑311‑653 3-211
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