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18.3
Trip logic (TR)
3.
Initiate a single-phase-to-earth fault and switch it off immedi-
ately when the trip signal is issued for the corresponding
phase. Initiate the same fault once again within the reclaim
time of the used autoreclosing function.
A three-phase trip must be initiated for the second fault.
Check that the corresponding trip signals appear after both faults.
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 immedi-
ately when the trip signal is issued for the corresponding
phase. Initiate the second single-phase-to-earth fault in one
of the remaining phases within the time interval, shorter than
two seconds and shorter than the dead-time of the autore-
closing 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
reclaim time of eventually activated autoreclosing function. Only
a single-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 outputs should be active.
2.
Initiate one-by one different phase-to-phase faults.
Consider sufficient time interval between the faults, to overcome a
reclaim time of eventually activated autoreclosing function. Only
a two-phase trip should occur for each separate fault and only cor-
responding two trip outputs (TRIP-TRLn) should be activated at a
time. Functional outputs TRIP-TRIP and TRIP-TR2P should be
active at each fault. No other outputs should be active.
Chapter 10
Verifying settings by secondary
injection
97
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