Completing The Test; Restricted Earth Fault Protection, Low Impedance Refpdif; Verifying The Settings - ABB ret650 Commissioning Manual

1MRK 504 126-UEN -
6.3.1.2
6.3.2
6.3.2.1
Commissioning Manual
12. If available on the test set a second harmonic current of about 20% (assumes
15% setting on I1/I2ratio parameter) can be added to the fundamental tone in
phase L1. Increase the current in phase L1 above the start value measured in
step 6. Repeat test with current injection in phases L2 and L3 respectively.
Note that during this test setting SOTFMode must be set to Off.
The balancing of currents flowing into and out of the differential zone is
typically checked by primary testing when suitable supply facilities exist on
site.
Fifth harmonic blocking can be tested in a similar way. Note, the blocking
level for the fifth harmonic is 10% higher than the I5/I1Ratio setting.

Completing the test

Continue to test another function or end the testing by setting the parameter
TestMode to Off under Main menu/Tests/IED test mode/1:TESTMODE. If
another function is tested, then set the parameter Blocked to No under Main menu/
Tests/Function test modes/Differential/T2WPDIF(87T,Id)/1:T2WPDIF for the
function, or for each individual function in a chain, to be tested next. Remember to
set the parameter Blocked to Yes, for each individual function that has been tested.
Continue to test another function or end the testing by setting the parameter
TestMode to Off under Main menu/Tests/IED test mode/1:TESTMODE. If
another function is tested, then set the parameter Blocked to No under Main menu/
Tests/Function test modes/Differential/T3WPDIF(87T,Id)/1:T3WPDIF for the
function, or for each individual function in a chain, to be tested next. Remember to
set the parameter Blocked to Yes, for each individual function that has been tested.

Restricted earth fault protection, low impedance REFPDIF

Prepare the IED for verification of settings as outlined in
verify settings".
Values of the logical signals for REFPDIF are available on the local HMI under
Main menu/Tests/Function status/Differential/REFPDIF(87,INd)/
X:REFPDIF. The Signal Monitoring in PCM600 shows the same signals that are
available on the local HMI.

Verifying the settings

Section 6
Testing functionality
5.1 "Preparing the IED to
41