Restricted Earth Fault Protection, Low Impedance Refpdif; Verifying The Settings; Completing The Test; High Impedance Differential Protection Hzpdif - ABB RET670 Installation And Commissioning Manual

1MRK 504 088-UEN C
13.4.2
13.4.2.1
13.4.2.2
13.4.3
13.4.3.1
Installation and commissioning manual

Restricted earth fault protection, low impedance REFPDIF

Prepare the IED for verification of settings as outlined in section
section "Preparing for test"

Verifying the settings

Procedure
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.

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.

High impedance differential protection HZPDIF

Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
Verifying the settings
Verifying settings by secondary injection
in this chapter.
in this chapter.
Section 13
"Overview" and
"Overview" and
115