Siemens Siprotec 7VK61 Manual page 118

Functions
2.6 Circuit breaker failure protection (optional)
Figure 2-31
If the trip is generated by an internal protection function or by an external protection device whose operating
principle is not necessarily associated with current flow, this is processed internally via the input „Start internal
w/o I" if the trip signal comes from the internal voltage protection or from an external protection via the binary
input „>BF Start w/o I". In this case, the start signal is maintained until the auxiliary contact criterion
signals the circuit breaker as being open.
Initiation can be blocked via the binary input „>BLOCK BkrFail" (e.g. during test of the feeder protection
relay).
Figure 2-32 Breaker failure protection with common phase initiation
118
Creation of signal "CB ≥ any pole closed"
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009