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7. ACCEPTANCE TESTS
TABLE 3: BREAKER FAILURE TRIPPING OUTPUT CONTACTS
7.9.
COUPLING DEVICE TEST
Set the three latching relays 52 EB/CS to the OFF position and connect them, applying +EB to terminal
EB11, make sure that -EB is applied to terminal EB-13.
Set the adjustment 50 of the coupling to 0.9 and set the time to 0.4 s that is:
1.- First step: 100 ms (SFI module).
2.- Second step: 300 ms (DTE module).
Remove the positive from EB11 to EB10. Apply current through EB23 and EB26, checking that:
• the differential does not trip.
• the 50 trips with 0.9 A.
• the restraint measured in the corresponding lead of the differential A is between 0.77-0.85.
• contacts EB1-EB, EB3-EB4, EB 9-EB10 and X25-X26, X27-X28 are closed.
Apply the same current through terminals EB24, EB26, checking as above (phase 2).
The same applies to terminals EB25, EB26 (phase 3).
Successively, apply current (0.9 A) through EB27, EB30 (phase l), EB28, EB30 (phase 2), EB29, EB30
(phase 3) and check that in all three cases, the restraint measured in the corresponding terminal of the
restraint module of differential B is between 0.77 and 0.85.
Check that the differential and the 50 + B.F. do not operate, making sure that contacts from EB1-EB2 EB3-
EB4 EB 9-EB10 and X25-X26, X27-X2 are open.
Set the timer of the coupling to the maximum. Apply a jumper from the positive to terminal EB10. Apply 1.2 A
through terminals EB27 and EB30, checking that:
• contact EB1, EB2 closes as soon as the differential trips and opens again after about 1 s.
• the three latching relays 52EB/CS are now in the reset position.
• the current is still closed by the above latching relays.
7-8
1st Step
9-10
TABLE 4: BREAKER FAILURE INITIATION
Phase A
Phase B
17
18
BUS1000 Busbar Protection
2nd Step
1-2, 3-4
Phase C
3 Phase
19
20
7.9.1. BUS A
7.9.2. BUS B
GEK-98514B
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