Breaker Pole Discrepancy Protection; Mode Of Operation - ABB RELION REB500 Operation Manual

Section 6
Additional protection options
To avoid false tripping after the circuit-breaker has opened, the delay for the end fault
protection must be set longer than the time t1 of BFP.
The current pick-up setting can be set the same as for BFP.
IEC18000466 V1 EN-US
Figure 19: Settings/End fault protection - Details
The Details view makes provision for activating and setting the pick-up value and delay of the
end fault protection for each bay. The pick-up delay is only of consequence when opening the
circuit-breaker.
6.5

Breaker pole discrepancy protection

6.5.1

Mode of operation

The breaker pole discrepancy protection is a local protection function in the bay unit which
supervises the three phase currents to ensure that the three circuit-breaker poles open and
close simultaneously. The tripping condition is fulfilled when at least one of the phase currents
is higher than setting (I
factor ∆pd
52
) and the difference between the phase currents (discrepancy
mset
) exceeds a given minimum for the set time.
set
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Distributed busbar protection REB500
Technical manual