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13.3
Tripping logic (TR)
If not the autoreclosing function is used the functional outputs
TRIP-TRIP, TRIP-TR1P and the corresponding phase signal
(TRIP-TRLn) should be active at each fault.
4.
Initiate a single-phase-to-earth fault and switch it off immediately
when the trip signal is issued for the corresponding phase. Initiate
the second single-phase-to-earth fault in one of the remaining phas-
es within the time interval, shorter than two seconds and shorter
than the dead-time of the autoreclosing function, when included in
protection scheme.
Check that the second trip is a three-phase trip.
1ph/2ph/3ph operating mode
The following tests should be carried out in addition to some other tests, which depends on the
complete configuration of a terminal:
Procedure
1.
Initiate one-by one different single-phase-to-earth faults.
Consider sufficient time interval between the faults, to overcome a re-
claim time of eventually activated autoreclosing function. Only a sin-
gle-phase trip should occur for each separate fault and only one of the trip
outputs (TRIP-TRLn) should be activated at a time. Functional outputs
TRIP-TRIP and TRIP-TR1P should be active at each fault. No other out-
puts should be active.
2.
Initiate one-by one different phase-to-phase faults.
Consider sufficient time interval between the faults, to overcome a re-
claim time of eventually activated autoreclosing function. Only a
two-phase trip should occur for each separate fault and only correspond-
ing two trip outputs (TRIP-TRLn) should be activated at a time. Func-
tional outputs TRIP-TRIP and TRIP-TR2P should be active at each fault.
No other outputs should be active.
3.
Initiate a three-phase fault.
Consider sufficient time interval between the faults, to overcome a re-
claim time of eventually activated autoreclosing function. Only a
three-phase trip should occur for the fault and all trip outputs
(TRIP-TRLn) should be activated at the same time. Functional outputs
TRIP-TRIP and TRIP-TR3P should be active at each fault. No other out-
puts should be active.
4.
Initiate a single-phase-to-earth fault and switch it off immediately
when the trip signal is issued for the corresponding phase. Initiate
the same fault once again within the reclaim time of the used autore-
closing function.
A three-phase trip must be initiated for the second fault.
Check that the corresponding trip signals appear after both faults.
Chapter 13
Verifying settings by secondary
injection
121
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