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E 2.2.3 -
F 2.2.4 -
G 2.2.4 The upper limit of ROA setting range is changed from 90 degrees to 119 degrees.
H 2.2.5 -
11.3.3.2 Verifying the settings
SEMOD55252-86 v12
1. Connect the test set for single-phase current injection to the protection terminals connected to the
CT in the power transformer neutral-to-ground circuit.
2. Increase the injection current and note the operating value of the protection function.
3. Check that all trip and pickup signals appear according to the configuration logic.
4. Decrease the current slowly from operate value and note the reset value.
5. Connect the timer and set the current to ten times the value of the IdMin setting.
6. Switch on the current and note the operate time.
7. Connect the test set to terminal A and neutral of the three-phase current input configured to
REFPDIF (87N). Also inject a current higher than half the IdMin setting in the neutral-to-ground
circuit with the same phase angle and with polarity corresponding to an internal fault.
8. Inject current into terminals B and C in the same way as in step 7 above and note the operate and
reset values.
9. Inject a current equal to 10% of rated current into terminal A.
10. Inject a current in the neutral-to-ground circuit with the same phase angle and with polarity
corresponding to an external fault.
11. Finally check that trip information is stored in the event and disturbance recorder.
11.3.3.3 Completing the test
SEMOD55252-118 v5
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.3.4 Additional security logic for differential protection LDRGFC (11)
GUID-0E064528-0E70-4FA1-87C7-581DADC1EB55 v2
11.3.4.1 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 v3
Procedure
1. Set Operation to Enabled.
2. Connect the test set for three phase current injection to the appropriate IED terminals.
3. Inject symmetrical phase currents equal to half the rated current
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 99
Commissioning manual
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