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7.6.1.1. Main Unit
Set the following adjustments in the differential boards:
-Slope: 0,5 (bridge on the left side of the board)
-Supervision: 0,2 (bridge on the right side of the board)
Apply current through terminals 23 and 26 of the position for phase 1, through 24 and 26 for phase 2,
through 25 and 26 for phase 3 and check that in all 3 instances, the corresponding main units operate
according to the following table:
Also check that contact 1, 2 of the position closes. (if the alarm operates, the contact will open)
Each time the differential unit operates the following contacts will close: X29-X30, X31-X32. These contacts
will remain closed until the reset button (place in cabinet 1 front panel) is pushed.
NOTE : Should the alarm go off as a result from the current having been applied for over 10 s, the differential
will be blocked and the corresponding red light in the test box will light up, and a message will show
up on the alarm's screen. In such event, to proceed with the test, the differential should be reset by
pressing the corresponding green button, and acknowledge the alarm to clear up the screen of the
alarms.
7.6.1.2. Supervision Units
Set the following adjustments in the differential boards:
-Slope: 0,5 (bridge on the left side of the board)
-Supervision: 0,2 (bridge on the right side of the board)
Apply current through terminals 23 and 26 of the position for phase 1, through 24 and 26 for phase 2,
through 25 and 26 for phase 3 and check that in all 3 instances, the corresponding supervision units operate
according to the following table:
Also check that contact 1, 2 of the position closes. (if the alarm operates, the contact will open)
Each time the differential unit operates the following contacts will close: X29-X30, X31-X32. These contacts
will remain closed until the reset bottom (place in cabinet 1 front panel) is pushed.
GEK-98514B
SLOPE
PICKUP CURRENT
0.5
0.190 - 0.210
0.6
0.237 - 0.263
0.7
0.313 - 0.347
0.8
0.475 - 0.525
ADJUSTM. VALUE
0.2
0.3
0.5
0.8
1.0
1.5
2
BUS1000 Busbar Protection
PICKUP VALUE
0.190-0.210
0.285-0.315
0.475-0.525
0.760-0.840
0.950-1.050
1.425-1.575
1.900-2.100
7. ACCEPTANCE TESTS
7-3
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