GE GEK-106273L, Instruction Manual

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RELAY COMMISSIONING
9-12 MIF Digital Feeder Protection GEK-106273L
9.19 THERMAL IMAGE UNIT (49)
1. Enable 49 function only.
2. Set the relay as follows:
49 Settings Group
Tap / Pickup 0.4 x In
Heating Time Constant T1 3 min.
Cooling Time Constant T2 1 times T1
3. Apply the following currents and check that the operating time is within the given range:
If your relay is 5 Amps rated current:
Relay Rated Current
(Amps)
Applied Current
(Amps)
Times the tap set in
the relay
Operating time
(sec.)
4.0 2 48.5 – 53.6
5 10.0 5 7.06 - 7.80
20.0 10 1.77 - 1.95
If your relay is 1 Amps rated current:
Relay Rated Current
(Amps)
Applied Current
(Amps)
Times the tap set in
the relay
Operating time (sec)
0.8 2 48.5 - 53.6
1 2.0 5 7.06 - 7.80
4.0 10 1.77 - 1.95
5 Repeat the test with a Heating Time Constant equal to 60 minutes. Check that the operating values are within the
given range:
If your relay is 5 Amps rated current:
Relay Rated Current
(Amps)
Applied Current
(Amps)
Times the tap set in
the relay
Operating time
(sec.)
4.0 2 960 - 1072
5 10.0 5 141 - 156
20.0 10 35.4 - 39
If your relay is 1 Amps rated current:
Relay Rated Current
(Amps)
Applied Current
(Amps)
Times the tap set in
the relay
Operating time
(sec.)
0.8 2 960 - 1072
1 2.0 5 141 - 156
4.0 10 35.4 - 39
Note: You must reset the Thermal Image Unit after each test, to start the following one from the same cold
status.
9.20 TIME SYNCHRONIZATION
Synchronise the relay date and time with the PC, using the ENERVISTA MII SETUP communications program.
Check using the keypad and display that the relay is actually in synchronism with the computer.