ABB Relion 670 series, Installation And Commissioning Manual

Page: 174 / 260

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.
15.6.1.1 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. Set the operation mode to 1 out of 3 .
3. Increase the injected current in the Ln phase until the TRL (n=1–3) signal
appears.
4. Switch the fault current off.
Observe: Do not exceed the maximum permitted overloading
of the current circuits in the IED.
5. Compare the measured operating current with the set value.
6. Set the operation mode to 2 out of 3 and inject current into one of the phases.
Check - no operation.
15.6.1.2 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.
15.6.2 Four step phase overcurrent protection OC4PTOC
Prepare the IED for verification of settings outlined in section "Overview" and
section "Preparing for test" in this chapter.
When inverse time overcurrent characteristic is selected, the
operate time of the stage will be the sum of the inverse time delay
and the set definite time delay. Thus, if only the inverse time delay
is required, it is of utmost importance to set the definite time delay
for that stage to zero.
15.6.2.1 Verifying the settings
1. Connect the test set for appropriate current injection to the appropriate IED
phases.
Section 15
1MRK 502 029-UEN A
Verifying settings by secondary injection
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Installation and commissioning manual