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26.4
148
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.
5.
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 single-phase trip in a second initiated
phase.
6.
Initiate a phase-to-phase fault and switch it off immediately when the
trip signal is issued for the corresponding two phases. Initiate anoth-
er phase-to-phase fault (not between the same phases) within the
time, shorter than 2 seconds.
Check, that the output signals, issued for the first fault, correspond to
two-phase trip for included phases.
The output signals for the second fault must correspond to the
three-phase tripping action.
Completing the test
Continue to test another function or complete the test by setting the test mode to off.
Chapter 13
Verifying settings by secondary
injection
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