GE Multilin 489 User Manual

5–50 489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
5.7.6 Overfrequency
PATH: SETPOINTS ZV S6 VOLTAGE ELEM. ZV 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 measured. 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.
1 OVERFREQUENCY [Z] BLOCK OVERFREQUENCY
FROM ONLINE: 1 s
Range: 0 to 5 s in steps of 1
MESSAGE
VOLTAGE LEVEL
CUTOFF: 0.50 x Rated
Range: 0.50 to 0.99 × Rated in steps of
0.01
MESSAGE
OVERFREQUENCY
ALARM: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to
5
MESSAGE
OVERFREQUENCY
ALARM LEVEL: 60.50 Hz
Range: 25.01 to 70.00 Hz in steps of
0.01
MESSAGE
OVERFREQUENCY
ALARM DELAY: 5.0 s
Range: 0.1 to 5000.0 s in steps of 0.1
MESSAGE
OVERFREQUENCY
ALARM EVENTS: Off
Range: On, Off
MESSAGE
OVERFREQUENCY
TRIP: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to
4
MESSAGE
OVERFREQUENCY
TRIP LEVEL1: 60.50 Hz
Range: 25.01 to 70.00 Hz in steps of
0.01
MESSAGE
OVERFREQUENCY
TRIP DELAY1: 60.0 s
Range: 0.1 to 5000.0 s in steps of 0.1
MESSAGE
OVERFREQUENCY
TRIP LEVEL2: 62.00 Hz
Range: 25.01 to 70.00 Hz in steps of
0.01
MESSAGE
OVERFREQUENCY
TRIP DELAY2: 30.0 s
Range: 0.1 to 5000.0 s in steps of 0.1
Courtesy of NationalSwitchgear.com

GE Multilin 489 Specifications

General

Brand	GE
Model	Multilin 489
Category	Relays
Language	English