2.13 Circuit Breaker Failure Protection
181
7SD610 Manual
C53000-G1176-C145-4
Figure 2-65 Creation of signal "CB ≥ any pole closed"
If an internal protection function or an external protection device trips without current
flow, the breaker failure protection is initiated by the internal input „Start internal w/o I“,
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 criterion.
Initiation can be blocked via the binary input „>BLOCK BkrFail“ (e.g. during test of
the feeder protection relay).
Figure 2-66 Breaker failure protection with common phase initiation
www . ElectricalPartManuals . com
To Next Page
Loading...
