GE BUS1000, Instructions Manual

Page: 46 / 129

7. ACCEPTANCE TESTS
7-10 BUS1000 Busbar Protection GEK-98514B
7.11. TEST ELEMENT TEST
7.11.1. AC AND SWITCHES CIRCUIT
Set the AL-DIF switch to position DIF; the TAKES switch (I, II, III) to position II; and switch 01,02,03 to
position 01.
Press the TEST button and check that the phase 1, corresponding to the pressed button, trips.
Set switch 01,02,03 to position 03. Press the TEST button and check that the phase 3, corresponding to the
button pressed, trips.
Set switch AL-DIF to position DIF; the TAP switch (I, II, III) to position III and proceed with the same check ,
as above.
NOTE : to test position l of the switch, slope and supervision adjustments must be lowered.
Set AL-DIF switch to position AL; TAP switch (I, II, III) to any position; and 01,02,03 switch to position 01.
Press the TEST button and check that after 10 s., the alarm in phase 1, as well as the alarm corresponding
to the button pressed, go off.
Set 01,02,03 switch to position 02. Press the TEST button and check that after 10 s., the phase 2 alarm of
the differential corresponding to the button pressed, goes off.
Set 01,02,03 switch to the position 03. Press the TEST button and check that after 10 s., the phase 3 alarm
of the differential corresponding to the button pressed, goes off.
7.11.2. ON AND OFF PUSH-BUTTONS CHECK
Check that the differential can be connected and disconnected with the ON and OFF push-buttons; for this
purpose, check the following:
When the green light of differential A is on, the latching relay 3B/87A will be in (1) whereas with the red one
on , it will be in (0) .
Do the same check with the other differential and with its corresponding 3B/87B latching relay.
7.11.3. TEST MEMORY CHECK
With the green light on, check that as you push the test button, the green light goes off as well as the red
one, and the corresponding 3B latching relay goes to (1).
Also check that when releasing the TEST button everything is automatically reset.
Check that while doing the same but with the red light on, this light will stay on with or without pushing the
button.
NOTE : Should any of the tests not be satisfactory, refer to UNITS CALIBRATION.