GE 489 - Manual (Page 119)

GE Multilin 489 Generator Management Relay 4-69
4 SETPOINTS 4.11 S10 MONITORING
4
4.11S10 MONITORING 4.11.1 TRIP COUNTER
PATH: SETPOINTS ÖØ S10 MONITORING Ö TRIP COUNTER
When enabled, a trip counter alarm will occur when the TRIP COUNTER ALARM LEVEL is reached. The trip counter must be
cleared or the alarm level raised and the reset key must be pressed (if the alarm was latched) to reset the alarm.
For example, it might be useful to set a Trip Counter alarm at 100 trips, prompting the operator or supervisor to investigate
the type of trips that have occurred. A breakdown of trips by type may be found in the
A4 MAINTENANCE ÖØ TRIP COUNTERS
actual values page. If a trend is detected, it would warrant further investigation.
4.11.2 BREAKER FAILURE
PATH: SETPOINTS ÖØ S10 MONITORING ÖØ BREAKER FAILURE
If the breaker failure alarm feature may be enabled as latched or unlatched. If the R1 Trip output relay is operated and the
generator current measured at any of the three output CTs is above the level programmed for the period of time specified
by the delay, a breaker failure alarm will occur. The time delay should be slightly longer than the breaker clearing time.
„ TRIP COUNTER
„ [ENTER] for more
TRIP COUNTER
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to 5
TRIP COUNTER ALARM
LEVEL: 25 Trips
Range: 1 to 50000 Trips in steps of 1
TRIP COUNTER ALARM
EVENTS: Off
Range: On, Off
„ BREAKER FAILURE
„ [ENTER] for more
BREAKER FAILURE
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to 5
BREAKER FAILURE
LEVEL: 1.00 x CT
Range: 0.05 to 20.00 × CT in steps of 0.01
BREAKER FAILURE
DELAY: 100 ms
Range: 10 to 1000 ms in steps of 10
BREAKER FAILURE
ALARM EVENTS: Off
Range: On, Off
ENTER
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