GE 489 User Manual

4-44 489 Generator Management Relay
GE Power Management
4.8 S7 POWER ELEMENTS 4 SETPOINT PROGRAMMING
4
4.8.4 LOW FORWARD POWER
If enabled, once the magnitude of 3-phase total power in the forward direction (+MW) falls below the Pickup Level for a
period of time specified by the Delay, an alarm will occur. The level is programmed in per unit of generator rated MW calcu-
lated from the rated MVA and rated power factor. The low forward power element is active only when the generator is online
and will be blocked until the generator is brought online, for a period of time defined by the setpoint Block Low Fwd Power
From Online. The pickup level should be set lower than expected generator loading during normal operations. If the VT
type is selected as "None" or VT fuse loss is detected, the low forward power protection is disabled.
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LOW FORWARD POWER
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[ENTER] for more
BLOCK LOW FWD POWER
FROM ONLINE: 0 s
Range: 0 to 15000 s in steps of 1
LOW FORWARD POWER
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to 5
LOW FWD POWER ALARM
LEVEL: 0.05 x Rated MW
Range: 0.02 to 0.99
×
Rated MW in steps of 0.01
LOW FWD POWER ALARM
DELAY: 10.0 s
Range: 0.2 to 120.0 s in steps of 0.1
LOW FWD POWER ALARM
EVENTS: Off
Range: On, Off
LOW FORWARD POWER
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
LOW FWD POWER TRIP
LEVEL: 0.05 x Rated MW
Range: 0.02 to 0.99
×
Rated MW in steps of 0.01
LOW FWD POWER TRIP
DELAY: 20.0 s
Range: 0.2 to 120.0 s in steps of 0.1
ENTER
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GE 489 Specifications

General

Brand	GE
Model	489
Category	Relays
Language	English