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7. ACCEPTANCE TESTS
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 previous terminals. Check
that both the alarms of the three phases operate with 28 mA (range: 27- 29mA) and that the red light of
differential A goes off while the red light lights up.
Check as well that X35-X36 contact is closed.
Bear in mind that every time the alarm operates, the differential must be reset by pressing the corresponding
green button.
Set the following adjustments in the differential boards of bus A:
-Slope: 0.8 (bridge on the left side of the board)
-Supervision: 1 (bridge on the right side of the board)
Remove jumpers from U1-U2, and P7-11 & P7-12.
Set the latching relay corresponding to Bus B, he line 7 (89B/P7) to the ON position, that is, make a jumper
between P7-11 & P7-14.
Set the BUSY/AB latching relay to the ON position, contact X45-X46 is closed. Apply positive to P7-13 and
these contacts will open.
Set the block latching relay corresponding to this differential to the ON position (3B/87B), check that X41-X42
is opened. The green light corresponding to bus B in the test box should be lit up. If not so, light it up by
pressing the green button.
Shorten the stabilization resistors and shorten U3 with U4.
7.6.2.1. 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 three instances, the corresponding main units operate
according to the following table:
Check as well that contacts 1 and 2 of the position close. (if the alarm operates, the contact opens).
7-4
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
BUS1000 Busbar Protection
7.6.2. BUS B
GEK-98514B
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