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Test points 8 and 9 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 6, 7, 8 and 9 once, in the forward direction (the largest
reverse zone can be used to facilitate the test) in order to test
the accuracy of directionality (directional angles). Directional
functionality testing (trip inside, no-trip outside) should
always be carried for all impedance zones set with
directionality (forward or reverse).
13.5.1.2
Measuring the operate 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
for zone 1. Compare
the result of the measurement with the setting
t1PP
.
3.
to find the operating time for the phase-to-earth fault
according to test point 10 in figure
measurement with the setting
t1PE
.
4.
Repeat steps
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.
When the load shaped characteristic is activated (
OperationLdCmp=On
) the
test point for phase-to-phase faults is 12 in figure
and table
earth faults according to P12 in figure
13.5.1.3
Completing the test
Continue to test another function or end the test by changing the test mode setting
to off.
13.5.2
Phase selection with load encroachment, quadrilateral
characteristic FDPSPDIS
Prepare the IED for verification of settings as outlined in section
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.
1MRK 504 088-UEN C
Section 13
Verifying settings by secondary injection
121
Installation and commissioning manual
Содержание RELION RET670
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