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Section 11
Testing functionality by secondary injection
11.3.5.9
Completing the test
Continue to test another function or end the test by navigating to Main menu/Test/IED test mode/
TESTMODE:1 and change the IEDTestMode setting to Off. Restore connections and settings to their
original values, if they were changed for testing purposes.
11.4
Impedance protection
11.4.1
Distance protection zones, quadrilateral characteristic
ZMQPDIS
Prepare the IED for verification of settings outlined in Section
Measure operating characteristics during constant current conditions. Keep the measured current as
close as possible to its rated value or lower. But make sure it is higher than the set minimum
operating current.
Ensure that the maximum continuous current to the IED does not exceed four times its rated value, if
the measurement of the operating characteristics runs under constant voltage conditions.
The test procedure has to take into consideration that the shaped load encroachment characteristic
is active. It is therefore necessary to check the setting. To verify the settings with the shaped load
encroachment characteristic the test should be carried out according to figures
20
and 21. In cases where the load encroachment characteristic is activated tests according to the
adjusted figures should be carried out.
To verify the settings for the operating points according to the following fault types should be tested:
•
One phase-to-phase fault
•
One phase-to-earth fault
The shape of the operating characteristic depends on the values of the setting parameters.
102
The figures illustrating the characteristic for the distance protection function can be
used for settings with and without load encroachment. The solid lines designate the
diagram applicable when the load current compensation is active. The solid line and
all test points except 13 are valid for this case.
When the load current compensation is inactive, the dotted lines and test point 13
are valid. Test points 5, 6, and 7 are not valid for this measurement.
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1MRK 504 165-UEN Rev. K
GUID-AC1E3D35-47CA-47C8-B653-C6F525A1CE31 v1
GUID-AF589812-9034-4DA4-B081-E3ACBA947058 v9
"Preparing the IED to verify
25
and
Transformer protection RET670
Commissioning manual
SEMOD53525-1 v2
settings".
26
and tables
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