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The injected current must be 4 times the operating current. The time
measurement is stopped by the trip output.
Note that tripping times at this loop test includes sending the local currents to
remote side and with a factor sending them back. This means that tripping
times are virtually double to the times achieved at a real fault or at bench
testing.
10. Check the negative sequence fault discriminator by injecting a three-phase
current with changed phase sequence: switch phases L1 and L2. The injected
current will now be seen as a pure negative-sequence current where the phase
angle between the local negative-sequence current and the remote negative-
sequence currents will be 120°.
With the current above
IMinNegSeq
, the signal external fault (EXTFAULT)
must apply. No trip must be generated.
11. Disconnect the test equipment and reconnect the current transformers.
12. Read and check the service values of the three-phase current.
13. Switch off the test mode and the release local.
14. With a through load current (maximum current of line ends) of minimum
20% of IBase the current IDiff and IBias are read in all phases.
IDiff must be less than 10% of the maximum line end current and IBias must
be equal to the largest line end current.
11.3.4.2
Completing the test
SEMOD56264-104 v5
Continue to test another function or end the test by changing the
TESTMODE
setting to
Off
. Restore connections and settings to their original values, if they were
changed for testing purposes.
After finishing a loop test with line in service and before leaving
test mode, the setting ReleaseLocal in local HMI under: Main
menu/Test/Line differential test/LineDiffLogic must be set to
BlockAll. If not, the load current might cause incorrect
operation of the differential function at restarts of the line
differential protection IED.
11.3.5
Additional security logic for differential protection LDRGFC
GUID-0E064528-0E70-4FA1-87C7-581DADC1EB55 v2
11.3.5.1
Verifying the settings
GUID-D9F626D4-4038-416F-888E-D3DB5047E79A v1
Prepare the IED for verification of settings outlined in section 1 “Overview” and
section 2 “Preparing for test” in this chapter.
Current variation local criteria
GUID-804E13B6-DC31-487B-A582-7886B1EF3EB7 v2
Procedure
1MRK 505 378-UEN A
Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC
111
Commissioning manual
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