1.
Supply the IED with healthy conditions for at least two seconds.
2.
Apply the fault condition and slowly decrease the measured impedance to find
the operate value for of the phase-to-earth loop L3, test point 1, according to
figure
. Compare the result of the measurement with the expected value
according to table
.
The corresponding binary signals that inform about the operation of the phase
selection measuring elements are available in the local HMI under
Main menu/Test/Function status/Impedance Protection/
PhaseSelection(PDIS, 21)/FRPSPDIS:x
.
3.
to find the operate values for the remaining test points
.
When the load encroachment characteristic is deliberately set
very high in order not to have an influence, then the test points 2
and 5 can be replaced by test point 7.
4.
Repeat steps
to find the operate value for the phase-to-phase fault in L1 —
10.4.6.2
Completing the test
Continue to test another function or end the test by changing the
TestMode
setting to
Off
. Restore connections and settings to their original values, if they were changed for
testing purposes.
10.4.7
High speed distance protection zones, quadrilateral and mho
characteristic ZMFPDIS
Prepare the IED for verification of settings outlined in section
in this chapter.
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.
1MRK 506 355-UEN A
Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC
107
Commissioning manual
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