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Each time the differential unit operates the following contacts will close: X37-X38, X39-X40. These contacts
will remain closed until the reset bottom (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.
7.6.2.2. 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: X37-X38, X39-X40. These contacts
will remain closed until the reset bottom (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.
Undo the bridges of the stabilization resistors and applying current through the above terminals check that
the alarms in all 3 phases operate with 28 mA (range: 27- 29mA); that the operation time is 10 s. (9.5, 10.5)
and that the green target of the differential B goes off as the red target lights up.
Check as well that contact X43-X44 closes taking into account that every time the alarm operates the
differential must be reset by pressing the corresponding green button.
Set the following adjustments to the differential boards of bus B:
Slope: 0.8 (bridge on the left side of the board)
Supervision: 1 (bridge on the right side of the board)
Remove jumpers from U3 and U4, P7-11 and P7-14. Apply positive to P7-15.
GEK-98514B
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
7-5
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