Underfrequency - GE 489 Instruction Manual

4 SETPOINT PROGRAMMING
T

UNDERFREQUENCY

T
[ENTER] for more
It may be undesirable to enable the underfrequency 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 underfrequency trip and alarm elements will
be active. A value of zero for the block time indicates that the underfrequency 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 is less than the underfrequency setpoints, for the period of time specified, a trip or alarm
will occur. There are dual level and time setpoints for the trip element.
GE Power Management
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BLOCK UNDERFREQUENCY
ENTER
FROM ONLINE: 1 s
ESCAPE
VOLTAGE LEVEL
ESCAPE
CUTOFF: 0.50 x Rated
MESSAGE
UNDERFREQUENCY
ESCAPE
ALARM: Off
MESSAGE
ASSIGN ALARM
ESCAPE
RELAYS (2-5): ---5
MESSAGE
UNDERFREQUENCY
ESCAPE
ALARM LEVEL: 59.50 Hz
MESSAGE
UNDERFREQUENCY
ESCAPE
ALARM DELAY: 5.0 s
MESSAGE
UNDERFREQUENCY
ESCAPE
ALARM EVENTS: Off
MESSAGE
UNDERFREQUENCY
ESCAPE
TRIP: Off
MESSAGE
ASSIGN TRIP
ESCAPE
RELAYS (1-4): 1---
MESSAGE
UNDERFREQUENCY
ESCAPE
TRIP LEVEL1: 59.50 Hz
MESSAGE
UNDERFREQUENCY
ESCAPE
TRIP DELAY1: 60.0 s
MESSAGE
UNDERFREQUENCY
ESCAPE
TRIP LEVEL2: 58.00 Hz
MESSAGE
UNDERFREQUENCY
ESCAPE
TRIP DELAY2: 30.0 s
MESSAGE
489 Generator Management Relay
4.7 S6 VOLTAGE ELEMENTS
4.7.5 UNDERFREQUENCY
Range: 0 to 5 s in steps of 1
Range: 0.50 to 0.99 × Rated in steps of 0.01
Range: Off, Latched, Unlatched
Range: Any combination of Relays 2 to 5
Range: 20.00 to 60.00 Hz in steps of 0.01
Range: 0.1 to 5000.0 s in steps of 0.1
Range: On, Off
Range: Off, Latched, Unlatched
Range: Any combination of Relays 1 to 4
Range: 20.00 to 60.00 Hz in steps of 0.01
Range: 0.1 to 5000.0 s in steps of 0.1
Range: 20.00 to 60.00 Hz in steps of 0.01
Range: 0.1 to 5000.0 s in steps of 0.1
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