1MRK 505 350-UEN Section 5
Additional protection options
Technical Manual 47
Distributed busbar protection REB500
Figure 16 Block diagram of EFP with CTs on the busbar side
To ensure that the end fault protection bases its decision on an effective image of
the circuit-breaker status, the signal “circuit-breaker open” is delayed while the
circuit-breaker is actually opening. If a current is measured when the circuit-
breaker is open, a tripping command is issued after a further delay (set to 36 ms).
The purpose of this timer is to enable a circuit-breaker close command to be
detected that is subject to internal signal transit times and breaker contact bounce
times.
Yes logic “1“
No logic “0“
Yes logic“1“
No logic “0“
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