ABB REL 551 2.3 Series Installation And Comissioning Manual page 127




Trip logic (TR)
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Prepare the terminal for verification of settings as outlined in section "Preparing for
test" in this chapter.
The function is tested functionally together with other protection functions (distance
protection ZMn--, line differential protection DIFL-, earth-fault overcurrent protection
IOC-- or TOC--, etc.) within the REx 5xx terminals. It is recommended to test the func-
tion together with the autoreclosing function, when built into the terminal or when a
separate external unit is used for the reclosing purposes.
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The function must issue a three-phase trip in all cases, when trip is initiated by any pro-
tection or some other built-in or external function. The following functional output sig-
nals must always appear simultaneously: TRIP-TRIP, TRIP-TRL1, TRIP-TRL2, TRIP-
TRL3 and TRIP-TR3P.
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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 three-phase trip should occur for each separate fault and all of the
trip outputs (TRIP-TRLn) should be activated at a time. Functional
outputs TRIP-TRIP and TRIP-TR3P should be active at each fault.
No other outputs should be active.
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