GE 489 - Manual (Page 88)

4-38 489 Generator Management Relay GE Multilin
4.7 S6 VOLTAGE ELEMENTS 4 SETPOINTS
4
4.7.6 OVERFREQUENCY
PATH: SETPOINTS ÖØ S6 VOLTAGE ELEMENTS ÖØ OVERFREQUENCY
It may be undesirable to enable the overfrequency elements until the generator is online. This feature can be blocked until
the generator is online and the block time expires. From that point forward, the overfrequency trip and alarm elements will
be active. A value of zero for the block time indicates that the overfrequency protection is active as soon as voltage
exceeds the cutoff level (programmed as a multiple of the generator rated phase-phase voltage). Frequency is then mea-
sured. Once the frequency of Vab exceeds the overfrequency setpoints, for the period of time specified, a trip or alarm will
occur. There are dual level and time setpoints for the trip element.
„ OVERFREQUENCY
„ [ENTER] for more
BLOCK OVERFREQUENCY
FROM ONLINE: 1 s
Range: 0 to 5 s in steps of 1
VOLTAGE LEVEL
CUTOFF: 0.50 x Rated
Range: 0.50 to 0.99 × Rated in steps of 0.01
OVERFREQUENCY
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to 5
OVERFREQUENCY
ALARM LEVEL: 60.50 Hz
Range: 25.01 to 70.00 Hz in steps of 0.01
OVERFREQUENCY
ALARM DELAY: 5.0 s
Range: 0.1 to 5000.0 s in steps of 0.1
OVERFREQUENCY
ALARM EVENTS: Off
Range: On, Off
OVERFREQUENCY
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
OVERFREQUENCY
TRIP LEVEL1: 60.50 Hz
Range: 25.01 to 70.00 Hz in steps of 0.01
OVERFREQUENCY
TRIP DELAY1: 60.0 s
Range: 0.1 to 5000.0 s in steps of 0.1
OVERFREQUENCY
TRIP LEVEL2: 62.00 Hz
Range: 25.01 to 70.00 Hz in steps of 0.01
OVERFREQUENCY
TRIP DELAY2: 30.0 s
Range: 0.1 to 5000.0 s in steps of 0.1
ENTER
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