GE Multilin DFF Instruction Manual page 41

7.13 VOLTAGE FUNCTION CHECKS.
NOTES: Voltage functions operate on phase B voltage. For undervoltage tests, initial voltage must be 10% higher
than trip voltage setting, and for overvoltage tests initial voltage must be 10% lower.
1. 27P UNDERVOLTAGE FUNCTION CHECKS
Set 27 function as follows:
27P PICKUP : 20 Vac
TIME DELAY 27P : 0 s.
RESET TIME 27P: 0 s.
Decrease the voltage and check that the relay trips with 19.4 Vac and drops out with 21.6 Vac
Modify the 27P PICKUP to 65 Vac
Decrease the voltage and check that the relay trips with 63.05 Vac and drops out with 70.2 Vac
Modify the 27P PICKUP to 110 Vac
Decrease the voltage and check that the relay trips with 106.7 Vac and drops out with 118.8 Vac
2. 59P OVERVOLTAGE FUNCTION CHECKS
Set 59P function as follows:
59P PICKUP: 50 Vac
TIME DELAY 59P: 0 s.
RESET TIME 59P: 0 s.
Increase the voltage and check that the relay trips with 51.5 Vac and drops out with 46 Vac
Modify the 59P PICKUP to 135 Vac
Increase the voltage and check that the relay trips with 139.05 Vac and drops out with 124.2 Vac
Modify the 59P PICKUP to 220 Vac
Increase the voltage and check that the relay trips with 226.6 Vac and drops out with 202.4 Vac.
40
ACCEPTANCE TESTS
DFF Digital Feeder Relay GEK-106166E