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6-18
G650 Generator Protection & Control System
GEK-113328A
6.14 OVERVOLTAGE ELEMENTS (59P, 59X, 59NH)
6 COMMISSIONING
6
6.14.3 59NH ELEMENT
Set the relay as follows
Apply voltage as indicated on the table under the overvoltage setting level and verify that the relay does not trip.
Verify that the relay trips for the set voltage (with an admissible error of 5%).
Vn voltage is calculated as a sum of the phase voltages.
NEUTRAL OV HIGH (59NH)
Function
ENABLED
Pickup Level
120 V
Trip Delay
2.00
Reset Delay
0.00
ELEMENTS
INPUT
PICKUP LEVEL
(VOLTS)
TRIP DELAY
(SECONDS)
APPLIED
VOLTAGE (V)
TRIPPING TIME (S)
EXPECTED
ADMISSIBLE
59NH
VI
120 2
114
NO
TRIP
NA
132
2
[1.9–2.1 ]
132
2
[1.9 – 2.1]