When the load encroachment characteristic is deliberately set very high in
order not to have an influence, then the test points 2 and 5 can be
replaced by test point 7.
4.
Repeat steps
to find the operate value for the phase-to-phase fault in L1 — L2
according to figure
12.4.6.2
Completing the test
M13906-301 v5
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.4.7
High speed distance protection zones, quadrilateral and mho
characteristic ZMFPDIS
GUID-DF1650F4-EC3E-402B-BE26-EF2EF1034237 v5
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
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
and tables
. 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.
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.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
118
Commissioning manual
