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1MRK 505 378-UEN Rev. K
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition and slowly decrease the measured impedance to find the operating
value of the phase-to-phase fault for zone 1 according to test point 1 in figure
Compare the result of the measurement with the set value.
3.
Repeat steps
Observe that the zones that are not tested have to be blocked and the zone that is tested has
to be released.
4.
Repeat steps 1 to 3 above to find the operating value for the phase-to-earth fault L3-E
according to figure
11.4.5.2
Measuring the operating time of distance protection zones
Procedure:
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition to find the operating time for the phase-to-phase fault according to test
point 10 in figure
setting tPP.
3.
Repeat steps
10 in figure
4.
Repeat steps
Observe that the zones that are not tested have to be blocked and the zone that is tested has
to be released.
11.4.6
Phase selection, quadrilateral characteristic with settable angle
FRPSPDIS
Prepare the IED for verification of settings as outlined in section
The phase selectors operate on the same measuring principles as the impedance measuring zones.
So it is necessary to follow the same principles as for distance protection, when performing the
secondary injection tests.
Measure operating characteristics during constant current conditions. Keep the measured current as
close as possible to the rated value of its associated input transformer, or lower. But ensure that it is
higher than 30% of the rated current.
Ensure that the maximum continuous current of an IED does not exceed four times its rated value, if
the measurement of the operating characteristics runs under constant voltage conditions.
To verify the settings the operating points according to figures
tables
29
Line differential protection RED670
Commissioning manual
1
to
2
to find the operating value for test points 2, 3 in table27.
30
and table 28.
Test points 8, 9, 10 and 11 are intended to test the directional lines of impedance
protection. Since directionality is a common function for all 5 measuring zones, it is
only necessary to test points 8, 9, 10 and 11 once, in the forward direction in order
to test the accuracy of directionality (directional angles). Directional functionality
testing (trip inside, no-trip outside) should always be made for all impedance zones
set with directionality (forward or reverse).
29
and table
1
to
2
to find the operating time for the phase-to-earth fault according to test point
30
and table 28. Compare the result of the measurement with the setting tPE.
1
to
2
to find the operating time for all other used measuring zones.
and
30
for information.
© 2017 - 2022 Hitachi Energy. All rights reserved
27
for zone 1. Compare the result of the measurement with the
Testing functionality by secondary injection
29
and table 27.
GUID-9AEFB83B-A343-4965-BB41-59062CC0DB5F v3
GUID-701C863B-40C6-42D7-A0C8-ECEB084B1165 v4
"Preparing for test"
in this chapter.
31
and
32
should be tested. See also
Section 11
111
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