ABB RELION RET670, Commissioning Manual, Page: 186 / 328

11.5.2.2 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled . Restore connections and settings to their original values, if they were changed
for testing purposes.
11.5.3 Instantaneous residual overcurrent protection EFPIOC (50N)
Prepare the IED for verification of settings outlined in Section "Preparing the IED to
verify settings" .
Values of the logical signals for EFPIOC are available on the local HMI under Main
menu/Tests/Function status/Current protection/
InstResidualOverCurrent(50N,IN>>)/EFPIOC(50N;IN>>):x
, where x = 1, 2, and 3.
The Signal Monitoring in PCM600 shows the same signals that are available on the local
HMI.
To verify the settings the following fault type should be tested:
• Phase-to-ground 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.
11.5.3.1 Measuring the trip limit of set values
1. Inject a phase current into the IED with an initial value below the set value of IN>>
and also make sure that the set value IN>> is in between IN>>Min and IN>>Max .
2. Increase the injected current in the Ln or in the neutral (summated current input)
phase until the TRIP signal appears.
3. Disable the fault current
Do not exceed the maximum permitted overloading of the current
circuits in the IED.
4. Compare the measured operating current with the set value.
Section 11
1MRK 504 165-UUS -
Testing functionality by secondary injection
180 Transformer protection RET670 2.2 ANSI
Commissioning manual