[logik-entsteh-signal-ls-hiko-wlk-010802, 1, en_GB]
Figure 2-35 Creation of signal "CB ≥ any pole closed"
If an internal protection function or an external protection device trips without current flow, the circuit
breaker failure protection is initiated by the internal input “Start internal w/o Ι”, if the trip signal comes from
the internal voltage protection or frequency protection, or by the external input
>BF Start w/o I
. In this
case the start signal is maintained until the circuit breaker is reported to be open by the auxiliary contact crite-
rion.
Initiation can be blocked via the binary input
>BLOCK BkrFail
(e.g. during test of the feeder protection
relay).
[logik-svs-phasengem-anwurf-wlk-010802, 1, en_GB]
Figure 2-36 Breaker failure protection with common phase initiation
Phase-segregated initiation
Phase segregated initiation of the circuit breaker failure protection is necessary if the circuit breaker poles are
operated individually, e.g. if 1-pole automatic reclosure is used. This is possible if the device is able to trip 1-
pole.
Functions
2.6 Circuit breaker failure protection (optional)
SIPROTEC 4, 7VK61, Manual 119
C53000-G1176-C159-5, Edition 05.2018
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