No ECHO and TRWEI should appear.
14. Switch the current off and check that the ECHO, CS and TRWEI appear on the
corresponding binary output during 200ms after resetting the directional element. If
EF4PTOC also trips in forward direction, CS should be obtained.
15. Switch the polarizing voltage off and reset the CRL binary input.
11.11.5.3 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
11.12 Logic
11.12.1 Tripping logic, common 3-phase output SMPPTRC (94)
Prepare the IED for verification of settings outlined in Section "Preparing the IED to
verify settings".
This function is functionality tested together with other protection functions (line
differential protection,ground-fault overcurrent protection, and so on) within the IED. It
is recommended that the function is tested together with the autorecloser function, when
built into the IED or when a separate external unit is used for reclosing purposes. The
testing is preferably done in conjunction with the complete protection scheme and
autoreclosing function.
11.12.1.1 3 phase operating mode
1. Check that AutoLock and TripLockout are both set to Disabled.
2. Initiate a three-phase fault.
An adequate time interval between the faults should be considered, to overcome a
reset time caused by the possible activation of the autorecloser function SMBRREC
(79). The function must issue a three-pole 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, TR_A, TR_B, TR_C and
TR3P.
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
270 Transformer protection RET670 2.2 ANSI
Commissioning manual
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