ABB REL670 - Distance Protection; Distance Protection Zones (PDIS, 21)

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Distance protection Chapter 11
Verifying settings by secondary
injection
5 Distance protection
5.1 Distance protection zones (PDIS, 21)
Prepare the IED for verification of settings as outlined in section 1 "Overview" and section2
"Preparing for test" in this chapter. Consider releasing Zone 1, the PHS and the TR0n. If the au-
torecloser is not released and in service, trip will always be three phase.
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 30% of the rated
current.
Ensure that the maximum continuous current in an IED does not exceed four times its rated val-
ue, if the measurement of the operating characteristics runs under constant voltage conditions.
The test procedure has to take into consideration whether the shaped load encroachment charac-
teristic is on or off. It is therefore necessary to check the setting. To verify the settings without
the shaped load encroachment characteristic the test should be carried out according to
figures 26 and 27 and tables 15 and 16. 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 (when the Ph-Ph measurement is included in the IED
SW)
• One phase-to-earth fault (when the Ph-E measurement is included in the IED
SW)
The shape of the operating characteristic depends on the values of the setting parameters.
The angles a (angle on blinder in second quadrant for forward direction), b (angle to blinder in
fourth quadrant for forward direction) and c (Load angle determining the load impedance area)
in the figures below are adjusted with the parameters ArgNegRes, ArgDir and ArgLd respec-
tively.
Note!
The diagrams 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 operationLdCom parameter is set to 1 (On). This is the de-
fault setting. The solid line and all test points except 13 are valid for this setting.
When it is set to 0 (Off) then the dotted lines and test point 13 are valid. Test points 5, 6, and 7
are not valid for this measurement.