&
MAIN:
CB1 open 3p EXT
[ 031 028 ]
INP:
Fct. assignm. U xxx
[ xxx yyy ]
U x01
U x02
U x03
U xxx
031 028
036 051
MAIN:
CB1 closed 3p EXT
[ 036 051 ]
&
&
&
CBF_1:
CB pos. implausible
[ 038 210 ]
64Z7031B
Address
Address
Fig. 3-129: Plausibility check of CB status signals
3.27.9 Startup Criteria
The startup of the circuit breaker failure protection function will occur when the
CB is recognized as closed during a start criterion. The following startup criteria
are evaluated:
●
Internal startup criterion:
Generating the specific general trip signal, which has been selected by
setting parameter CBF_1: Fct.assign. starting, is considered a startup
criterion. In addition it may be selected, by setting the parameter
CBF_1: Start with man. trip, that a manual trip signal will also be used
as a startup criterion.
●
External startup criterion:
Triggering by a protection device operating in parallel (CBF_1: Start 3p
EXT) may be used as a startup criterion. To be on the safe side an
additional two-pole triggering may be implemented by applying the signal
CBF_1: Start enable EXT.
Once started, the CBF function will only drop out when a successful opening has
been detected from the current flow monitoring or, in some cases, when the CB
signals that its contacts are open.
3.27.9.1 Timers and Tripping Logic
Associated timer stages are started when a startup criterion is met.
●
The signal CBF_1: Trip signal t1 will be issued if the startup criterion is
still present when the time delay, set at timer stage CBF_1: t1 3p, has
elapsed. The output command from this timer stage is intended for a
second CB trip coil.
●
The signal CBF_1: Trip signal t2 will be issued if the startup criterion is
still present when the time delay, set at timer stage CBF_1: t2, has
elapsed. The output command from this timer stage is intended for a
backup circuit breaker or protection system.
These trip signals will be issued as long as the startup criteria are met.
Should a loss of gas pressure occur in the de-arcing chambers of installed type
SF6 circuit breakers then all surrounding circuit breakers must be immediately
tripped without waiting for a reaction from the damaged switch. In case of an
external CB_ 1 fault the elapsing of timer stage t2 may be interrupted by a signal
to the binary signal input appropriately configured at CBF_1: CB faulty EXT.
P631
3 Operation
3-162 P631/EN M/R-11-C // P631-310-650
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