Undervoltage Unit; Overvoltage Unit; Zero Sequence Overvoltage Unit, High Level (59 Nh) - GE SMOR-B GEK 105593C Instructions Manual

• Apply 36 Vac on phase B, at a frequency of 54 Hz. The relay should not trip, due to the voltage
supervision.

6.22. UNDERVOLTAGE UNIT (27)

• Enable only 27P function and its related trip.
• Set the relay as follows:
27/'59 Functions Settings Group
27P Pick up
Time Delay 27P
• Apply on the three phases of the relay 6.4 Vac and check that the relay does not trip.
• Apply 5.2 Vac and check that the relay trips.
• Check that for this trip, the operating time is in between 0.18 and 0.22 sec.
• Set the relay as follows:
27/'59 Functions Settings Group
27P Pick up
Time Delay 27P
• Apply on the three phases of the relay 60.5 Vac and check that the relay does not trip.
• Apply 54.8 Vac and check that the relay trips.
• Check that for this trip, the operating time is in between 3.9 and 4.1 sec.

6.23. OVERVOLTAGE UNIT (59)

• Enable only 59P function and its related trip.
• Set the relay as follows:
27/'59 Functions Settings Group
59P Pick up
Time Delay 59P
• Apply on phase A of the relay 9 Vac and check that the relay does not trip.
• Apply 11 Vac and check that the relay trips.
• Check that for this trip, the operating time is in between 0.18 and 0.22 sec.
• Set the relay as follows:
27/'59 Functions Settings Group
27P Pick up
Time Delay 27P
• Apply on phase A of the relay 95 Vac and check that the relay does not trip.
• Apply 105 Vac and check that the relay trips.
• Check that for this trip, the operating time is in between 3.9 and 4.1 sec.
• Repeat both tests for phases B and C.

6.24. ZERO SEQUENCE OVERVOLTAGE UNIT, HIGH LEVEL (59 NH)

• Enable only 59NH function and its related trip.
• Set the relay as follows:
GEK-105593C
10 V (ph-ph) (5.77 V ph-gnd)
0.20 sec
100 V (ph-ph) (57.7 V ph-gnd)
4.0 sec
10 V (ph-ph)
0.20 sec
100 V (ph-ph) (57.7 V ph-gnd)
4.0 sec
59