GE DFF1000 Series, Instructions Manual, Page: 40 / 59

GEK – 106166B
37
7.11 CONTROL OPERATIONS.
1. Time setting.
Set date and time of the relay and verify the proper operation.
2. Communications Trigger.
Apply to any phase a voltage signal, operate the communication trigger of the oscillography waveform capture
function. Retrieve the oscillography register through GE_LOCAL software and display the record using GE_OSC
software package. Verify that the captured waveform fits with the applied voltage signal.
7.12 INHIBITION VOLTAGE CHECKING.
NOTE: Tests must be done with phase B and 50 Hz frequency .
•
Set the relay to 50 Hz.
•
Set one frequency unit as absolute threshold and set the operating value to 60 Hz.
•
Set nominal voltage to 90 Vac.
•
Set inhibition voltage to 40 %.
•
Check that the unit trips with 22.5 Vac and does not trip with 20 Vac
•
Set inhibition voltage to 110 %.
•
Check that the unit trips with 61.75 Vac and does not trip with 55 Vac.
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Set nominal voltage to 220 Vac.
•
Set inhibition voltage to 40 %.
•
Check that the unit trips with 54.9 Vac and does not trip with 49 Vac.
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Set inhibition voltage to 110 %.
•
Check that the unit trips with 150.9 Vac and does not trip with 135.5 Vac
7.13 VOLTAGE FUNCTIONS CHECKING.
NOTES: Voltage functions are only done in phase B. In undervoltage tests, initial voltage must be 10% higher than
trip voltage, and in overvoltage ones 10% lower.
1. 27P FUNCTION CHECKING
Set 27 function as follows:
27P PICKUP : 20 Vac
27P OPERATION t : 0 s.
27P RESET t : 0 s.
Decrease the voltage and check that the relay trips with 19.6 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