Schweitzer Engineering Laboratories SEL-351A - Figure 8.8 Input IN106 Connected to Trip Bus for Breaker Monitor Initiation

8.14
SEL-351A Relay Instruction Manual Date Code 20080213
Breaker Monitor and Metering
Breaker Monitor
Figure 8.8 Input IN106 Connected to Trip Bus for Breaker Monitor Initiation
If the SELOGIC control equation breaker monitor initiation setting is set:
BKMON = IN106
then the SEL-351A 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).
TC
CS/T
(Control
Switch Trip)
Other
External
Trips
OUT101
= TRIP
TRIP
COIL
52A
IN106
Trip Bus
SEL-351
(+)
(—)
Courtesy of NationalSwitchgear.com