9-18 G650 Generator Protection & Control System GEK-113285A
9.14 OVERVOLTAGE ELEMENTS (59P, 59X, 59NH) 9 COMMISSIONING
9.14.3 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]
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