Micom P634 - Startup Criteria

&
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. 3-162: Plausibility check of CB status signals
3.31.9 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. A false CBF operation due to
spurious pick-up of this binary input signal is prevented as follows:
– If only one input signal is available as trigger, this input must be active as
long as the CBF timer is running. Otherwise CBF resets as soon as the
trigger input signal resets.
– Alternatively a two-pole trigger control may be implemented by applying
the additional signal CBF_1: Start enable EXT.
Once started from internal trigger or external two-pole inputs, 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.
P634
3 Operation
3-208 P634/EN M/R-42-A // P634‑311‑653