Completing The Test; Impedance Protection; Distance Protection Zones, Quadrilateral Characteristic Zmqpdis (21) - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
5. Connect a trip output contact to a timer.
6. Decrease the injected current stepwise to 50 % of the trip level and check the time delay.
7. Repeat steps 3 – 6 for phases B and C.
10.3.4.2

Completing the test

Continue to test another function or end the test by changing the test mode setting to disabled.
Restore connections and settings to their original values, if they were changed for testing
purposes.
10.4

Impedance protection

10.4.1 Distance protection zones, quadrilateral characteristic ZMQPDIS
(21)
Prepare the IED for verification of settings outlined in section "Requirements" and section
"Preparing for test" 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 14
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-ground fault
The shape of the operating characteristic depends on the values of the setting parameters.
Commissioning manual
and 15 and tables 17 and 18. In cases where the load encroachment characteristic is
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.
Testing functionality by secondary injection
GUID-BE74F565-7465-4300-B2A6-D99CE8844147 v2
GUID-AF589812-9034-4DA4-B081-E3ACBA947058 v9
Section 10
SEMOD53525-1 v2
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