ABB Relion 670 series, Installation And Commissioning Manual

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Check of the non-directional phase overcurrent function. This
is done in principle as instructed above, without applying any
polarizing voltage.
15.6.2.2 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.
15.6.3 Instantaneous residual overcurrent protection EFPIOC
Prepare the IED for verification of settings outlined in section "Overview" and
section "Preparing for test" in this chapter.
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.
15.6.3.1 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.
15.6.3.2 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.
15.6.4 Four step residual overcurrent protection EF4PTOC
Prepare the IED for verification of settings outlined in section "Overview" and
section "Preparing for test" in this chapter.
Section 15
1MRK 502 029-UEN A
Verifying settings by secondary injection
170
Installation and commissioning manual