Table of Contents
Advertisement
16
16.1
16.2
100
Trip logic (TR)
Trip logic (TR)
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.
3ph operating mode
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.
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
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 different phase-to-phase and three-phase faults.
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.
Chapter 11
Verifying settings by secondary
injection
Advertisement
Table of Contents
