
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
. 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.
6.3.1.2
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.
6.3.2
Restricted earth fault protection, low impedance REFPDIF
Prepare the IED for verification of settings as outlined in
.
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.
6.3.2.1
Verifying the settings
1MRK 504 126-UEN -
Section 6
Testing functionality
41
Commissioning Manual
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