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1MRK 505 378-UEN Rev. K
1.
Connect the test set for three phase current injection to the appropriate IED terminals.
2.
Inject a symmetrical three phase current larger than the set value IUC<
3.
Decrease the injected current in phase L1 and note the operate value (start value) of the
studied step of the function.
4.
Increase the current slowly and note the reset value.
5.
Connect a trip output contact to a timer.
6.
Decrease the injected current stepwise to 50 % of the operate level and check the time delay.
7.
Repeat steps 3 – 6 for phases L2 and L3.
11.3.5.2
Completing the test
Continue to test another function or end the test by changing the test mode 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
21
and 22. 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.
Line differential protection RED670
Commissioning manual
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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Testing functionality by secondary injection
GUID-BE74F565-7465-4300-B2A6-D99CE8844147 v2
GUID-AF589812-9034-4DA4-B081-E3ACBA947058 v9
"Preparing the IED to verify
23
and
Section 11
SEMOD53525-1 v2
settings".
24
and tables
99
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