If the circuit breaker failure protection is intended to be initiated by further external protection devices, it is
recommended, for security reasons, to connect two binary inputs to the device. Besides the three trip
commands of the external relay to the binary input
>BF Start L1
,
>BF Start L2
and
>BF Start L3
it
is recommended to connect also, for example, the general device pickup to binary input
>BF release
.
shows this connection.
Nevertheless, it is possible to initiate the circuit breaker failure protection in single-channel mode should a
separate release criterion not be available. The binary input
>BF release
must then not be assigned to any
physical input of the device during configuration.
If the external protection device does not provide a general fault detection signal, a general trip signal can be
used instead. Alternatively, the parallel connection of a separate set of trip contacts can produce such a
release signal as shown in
[svs-phasegetr-anwurf-ext-geraet-wlk-010802, 1, en_GB]
Figure 2-37
Breaker failure protection with phase segregated initiation — example for initiation by an
external protection device with release by a fault detection signal
[svs-phasegetr-anwurf-ext-geraet-frei-ausloese-wlk-010802, 1, en_GB]
Figure 2-38
Schalterversagerschutz mit phasengetrenntem Anwurf — Beispiel für Anwurf von externem
Schutzgerät mit Freigabe durch einen getrennten Satz Auslösekontakte
In principle, the starting condition logic for the delay time(s) is designed similar to that for the common phase
initiation, however, individually for each of the three phases (as shown in
). Thus, current and
initiation conditions are processed for each CB pole. Also during a 1-pole automatic reclosure, the current
interruption is reliably monitored for the tripped CB pole only.
Initiation of an individual phase, e.g. “Start L1”, is only valid if the starting signal (= tripping signal of the
feeder protection) appears for this phase and if the current criterion is met for at least this phase. If it is not
met, the circuit breaker auxiliary contact can be interrogated according to
– if parameterised (
Chk
BRK CONTACT
=
YES
).
The auxiliary contact criterion is also processed for each individual circuit breaker pole. If, however, the circuit
breaker auxiliary contacts are not available for each individual circuit breaker pole, then a 1-pole trip
command is assumed to be executed only if the series connection of the normally open (NO) auxiliary
Functions
2.6 Circuit breaker failure protection (optional)
120
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Summary of Contents for SIPROTEC 4 7VK61
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