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).
11.4.5.2 Measuring the operating time of distance protection zones
GUID-9AEFB83B-A343-4965-BB41-59062CC0DB5F v3
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 29 and table 26 for zone 1. Compare
the result of the measurement with the setting tPP.
3. Repeat steps 1 to 2 to find the operating time for the phase-to-earth
fault
according to test point 10 in figure
30 and table 27. Compare the result of the
measurement with the setting tPE.
4. Repeat steps 1 to 2 to find the operating time for all other used measuring
zones.
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
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Prepare the
IED for verification of settings as outlined in section
"Preparing for
test" in this chapter.
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
31 and 32 should be
tested. See also tables 28 and 29 for information.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
128 Line differential protection RED670 2.2 IEC
Commissioning manual
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