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Section 10
Testing functionality by secondary injection
10.3.2.2
10.4
10.4.1
90
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.
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.
Impedance protection
Distance protection zones, quadrilateral characteristic
ZMQPDIS
Prepare the IED for verification of settings outlined in section
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
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.
The figures illustrating the characteristic for the distance protection
function can be used for settings with and without load encroachment.
14
and
15
and tables
17
1MRK 506 355-UEN A
"Preparing the IED to
and 18. In cases where the load
Line distance protection REL670 2.1 IEC
Commissioning manual
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