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13
13.1
13.2
120
Tripping logic (TR)
Tripping logic (TR)
Prepare the terminal for verification of settings as outlined 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 function together with the au-
toreclosing function, when built into the terminal or when a separate external unit is used for the
reclosing purposes.
3ph operating mode
The function must issue a three-phase trip in all cases, when trip is initiated by any protection or
some other built-in or external function. The following functional output signals must always
appear simultaneously: TRIP-TRIP, TRIP-TRL1, TRIP-TRL2, TRIP-TRL3 and TRIP-TR3P.
1ph/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 different phase-to-phase and three-phase faults.
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 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 out-
puts should be active.
3.
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
section 2 "Preparing for test"
injection
in
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