5.30
SEL-751 Relay Instruction Manual Date Code 20170927
Metering and Monitoring
Breaker Monitor
If the SELOGIC control equation breaker monitor initiation setting is
set:
BKMON = INxxx
then the SEL-751 breaker monitor sees all trips.
If output contact OUT103 asserts, energizing the trip bus, the breaker
monitor deems it a relay initiated trip. This is because when BKMON is
newly asserted (input INxxx energized), the TRIP Relay Word bit is
asserted. Thus, the current and trip count information is accumulated
under relay initiated trips (Rly Trips).
If the control switch trip (or some other external trip) asserts,
energizing the trip bus, the breaker monitor deems it an externally
initiated trip. This is because when BKMON is newly asserted (input
INxxx energized), the TRIP Relay Word bit is deasserted. Thus, the
current and trip count information is accumulated under externally
initiated trips (Ext Trips).