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
Table 20 is used together with figure 17.
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 16. Compare the result of the measurement with the expected value
according to table
19.
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. Repeat steps 1 to 2 to find the operate values for the remaining test points
according to figure 16 and table 19.
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 1 to 3 to find the operate value for the phase-to-phase fault in L1 —
L2 according to figure 17 and table 20.
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
"Preparing the IED to
verify settings".
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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