ABB RELION RET670, Commissioning Manual, Page: 179 / 328

11.4.14.1 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.
11.4.15 Under impedance protection for Generator ZGVPDIS
Prepare the IED for verification of settings.
Values of the logical signals for ZGVPDIS are available on the local HMI under Main
menu/Tests/Function status/Impedance/ZGVPDIS (21G, Z<)/
1:ZGVPDIS:ZGVPDIS
. The Signal Monitoring in PCM600 shows the same signals that
are available on the local HMI.
11.4.15.1 Verifying the settings
Distance protection zones
While measuring operating characteristics, keep the current constant. Keep the current as
close as possible to its rated value or lower, however make sure it is higher than 30% of
the rated current.
If the measurement of the operating characteristics runs under constant voltage
conditions, ensure that the maximum continuous current in an IED does not exceed four
times its rated value.
To verify the zone 1 mho characteristic, at least two points must be tested.
1MRK 504 165-UUS -
Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 173
Commissioning manual