8.14
SEL-311C Relay Instruction Manual Date Code 20060320
Breaker Monitor and Metering Functions
Breaker Monitor
If the SELOGIC control equation breaker monitor initiation setting is set:
BKMON = IN106
then the SEL-311C 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 IN106 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 IN106 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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