5.26
SEL-751A Relay Instruction Manual Date Code 20100129
Metering and Monitoring
Breaker Monitor
If the SELOGIC control equation breaker monitor initiation setting is
set:
BKMON = INxxx
then the SEL-751A breaker monitor sees all trips.
If output contact OUT101 asserts, energizing the trip bus, the breaker
monitor will deem 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 will deem 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).
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