Neutral Undervoltage (3Rd Harmonic) - GE 489 Instruction Manual

4.7 S6 VOLTAGE ELEMENTS
4
If the ground directional element is enabled, the Neutral Overvoltage element should be coordinated with it. In
cases of paralleled generator grounds through the same point, with individual ground switches, per sketch below, it
NOTE
is recommended to use a ground switch status function to prevent maloperation of the element.
T
NEUTRAL U/V (3rd)
T
[ENTER] for more
4-36
GROUNDING SWITCH
59G
TO Vneutral OF EACH 489
Figure 4–6: NEUTRAL OVERVOLTAGE DETECTION
ð
LOW POWER BLOCKING
ENTER
LEVEL: 0.05 x Rated MW
ESCAPE
LOW VOLTAGE BLOCKING
ESCAPE
LEVEL: 0.75 x Rated
MESSAGE
NEUTRAL UNDERVOLTAGE
ESCAPE
ALARM: Off
MESSAGE
ASSIGN ALARM
ESCAPE
RELAYS (2-5): ---5
MESSAGE
NEUTRAL U/V ALARM
ESCAPE
LEVEL: 0.5 Vsec
MESSAGE
NEUTRAL UNDERVOLTAGE
ESCAPE
ALARM DELAY: 30 s
MESSAGE
NEUTRAL UNDERVOLTAGE
ESCAPE
ALARM EVENTS: Off
MESSAGE
NEUTRAL UNDERVOLTAGE
ESCAPE
TRIP: Off
MESSAGE
ASSIGN TRIP
ESCAPE
RELAYS (1-4): 1---
MESSAGE
NEUTRAL U/V TRIP
ESCAPE
LEVEL: 1.0 Vsec
MESSAGE
NEUTRAL UNDERVOLTAGE
ESCAPE
TRIP DELAY: 30 s
MESSAGE
489 Generator Management Relay
AUXILIARY CONTACT
TO DIGITAL INPUT FOR
NEUTRAL O/V SUPERVISION
C(B)
A
B(C)
GENERATOR 1 GENERATOR 2

4.7.8 NEUTRAL UNDERVOLTAGE (3RD HARMONIC)

Range: 0.02 to 0.99 × Rated MW in steps of 0.01
Seen only if VT CONNECTION is Delta
Range: 0.50 to 1.00 × Rated in steps of 0.01
Seen only if VT CONNECTION is Delta
Range: Off, Latched, Unlatched
Range: Any combination of Relays 2 to 5
Range: 0.5 to 20.0 Vsec in steps of 0.1
Seen only if VT CONNECTION is Delta
Range: 5 to 120 s in steps of 1
Range: On, Off
Range: Off, Latched, Unlatched
Range: Any combination of Relays 1 to 4
Range: 0.5 to 20.0 Vsec in steps of 0.1
Seen only if VT CONNECTION is Delta
Range: 5 to 120 s in steps of 1
4 SETPOINT PROGRAMMING
C(B)
A
B(C)
808816A3.CDR
GE Power Management