Overfrequency - GE 489 Instruction Manual

4.7 S6 VOLTAGE ELEMENTS
T

OVERFREQUENCY

T
[ENTER] for more
4
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.
4-34
ð
BLOCK OVERFREQUENCY
ENTER
FROM ONLINE: 1 s
ESCAPE
VOLTAGE LEVEL
ESCAPE
CUTOFF: 0.50 x Rated
MESSAGE
OVERFREQUENCY
ESCAPE
ALARM: Off
MESSAGE
ASSIGN ALARM
ESCAPE
RELAYS (2-5): ---5
MESSAGE
OVERFREQUENCY
ESCAPE
ALARM LEVEL: 60.50 Hz
MESSAGE
OVERFREQUENCY
ESCAPE
ALARM DELAY: 5.0 s
MESSAGE
OVERFREQUENCY
ESCAPE
ALARM EVENTS: Off
MESSAGE
OVERFREQUENCY
ESCAPE
TRIP: Off
MESSAGE
ASSIGN TRIP
ESCAPE
RELAYS (1-4): 1---
MESSAGE
OVERFREQUENCY
ESCAPE
TRIP LEVEL1: 60.50 Hz
MESSAGE
OVERFREQUENCY
ESCAPE
TRIP DELAY1: 60.0 s
MESSAGE
OVERFREQUENCY
ESCAPE
TRIP LEVEL2: 62.00 Hz
MESSAGE
OVERFREQUENCY
ESCAPE
TRIP DELAY2: 30.0 s
MESSAGE
489 Generator Management Relay
4 SETPOINT PROGRAMMING
4.7.6 OVERFREQUENCY
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: 25.01 to 70.00 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: 25.01 to 70.00 Hz in steps of 0.01
Range: 0.1 to 5000.0 s in steps of 0.1
Range: 25.01 to 70.00 Hz in steps of 0.01
Range: 0.1 to 5000.0 s in steps of 0.1
GE Power Management