Low current criteria
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Procedure
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
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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
SEMOD53525-1 v2
11.4.1 Distance protection zones, quadrilateral characteristic
ZMQPDIS
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Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
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
23 and 24 and tables 20 and 21. In cases where the load
encroachment characteristic is activated tests according to the adjusted figures
should be carried out.
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 113
Commissioning manual
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