High Speed Distance Protection Zones, Quadrilateral And Mho Characteristic Zmfpdis (21) - ABB RET670 Commissioning Manual

Section 10
Testing functionality by secondary injection
10.4.7 High speed distance protection zones, quadrilateral and mho
characteristic ZMFPDIS (21)
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
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
24 and 25
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-ground fault
The shape of the operating characteristic depends on the values of the setting parameters.
100
in this chapter.
and tables 27 and 28. In cases where the load encroachment characteristic is activated
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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"Requirements" and
Commissioning manual