ABB REL 551 2.3 Series - Page 128

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Trip logic (TR) &KDSWHU
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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.
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Check that the second trip is a three-phase trip.
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The following tests should be carried out in addition to some other tests, which depends
on the complete configuration of a terminal:
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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.
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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.