Completing The Test; Instantaneous Residual Overcurrent Protection Efpioc; Measuring The Operate Limit Of Set Values - ABB RET670 Installation And Commissioning Manual

1MRK 504 088-UEN C
13.6.2.2
13.6.3
13.6.3.1
13.6.3.2
Installation and commissioning manual
13. If 2 out of 3 or 3 out of 3 currents for operation is chosen: Check that the
function will not operate with current in one phase only.
14. Repeat the above described tests for the higher set stages.
15. Finally check that start and trip information is stored in the event menu.
Check of the non-directional phase overcurrent function. This
is done in principle as instructed above, without applying any
polarizing voltage.

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.

Instantaneous residual overcurrent protection EFPIOC

Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
To verify the settings the following fault type should be tested:
• Phase-to-earth fault
Ensure that the maximum continuous current, supplied from the current source
used for the test of the IED, does not exceed four times the rated current value of
the IED.

Measuring the operate limit of set values

1. Inject a phase current into the IED with an initial value below that of the setting.
2. Increase the injected current in the Ln or in the neutral (summated current
input) phase until the TRIP signal appears.
3. Switch the fault current off.
Observe to not exceed the maximum permitted overloading of the current
circuits in the IED
4. Compare the measured operating current with the set value.
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.
Verifying settings by secondary injection
in this chapter.
Section 13
"Overview" and
137