ABB Relion 670 series, Installation And Commissioning Manual

Page: 164 / 260

For more detailed formulas please refer to the application
manual.
15.4.2.2 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off . Restore connections and settings to their original values, if they were
changed for testing purposes.
15.4.3 Restricted earth fault protection, low impedance REFPDIF
Prepare the IED for verification of settings outlined in section "Overview" and
section "Preparing for test" in this chapter.
15.4.3.1 Verifying the settings
1. Connect the test set for single-phase current injection to the protection
terminals connected to the CT in the power transformer neutral-to-earth circuit.
2. Increase the injection current and note the operating value of the protection
function.
3. Check that all trip and start contacts operate 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 twice the operate value.
6. Switch on the current and note the operate time.
7. Connect the test set to terminal L1 and neutral of the three-phase current input
configured to REFPDIF. Also inject a current higher than half the
Idmin
setting in the neutral-to-earth circuit with the same phase angle and with
polarity corresponding to an internal fault.
8. Increase the current injected in L1, and note the operate value. Decrease the
current slowly and note the reset value.
9. Inject current into terminals L2 and L3 in the same way as in point 7 above
and note the operate and reset values.
10. Inject a current equal to 10% of rated current into terminal L1.
11. Inject a current in the neutral-to-earth circuit with the same phase angle and
with polarity corresponding to an external fault.
12. Increase the current to five times the operating value and check that the
protection does not operate.
13. Finally check that trip information is stored in the event menu.
15.4.3.2 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off . Restore connections and settings to their original values, if they were
changed for testing purposes.
Section 15
1MRK 502 029-UEN A
Verifying settings by secondary injection
158
Installation and commissioning manual