Test point
Reach
Value
Comments
5
X
0.5·RFFwPP·tan (ArgLd)
Only when RLdFW < RFFwPP
R
0.5·RFFwPP
6
X
-0.5·RLdFw·tan (ArgDir)
R
0.5·RLdFw
10.4.2.1
Measuring the operating limit of set values
Procedure:
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)/FDPSPDIS: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 —
10.4.2.2
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.
10.4.3
Full scheme distance protection, mho characteristic
ZMHPDIS
Prepare the IED for verification of settings outlined in section
.
Consider releasing of the zone to be tested by setting the phase selector FMPSPDIS to
On
.
1MRK 506 355-UEN A
Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC
97
Commissioning manual
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