Test point
Value
Comments
3
X
0.85·[X1+XN]
R≈0.491·(X1+XN)+RFFwPE
R
0.85·[X1+XN]·1/tan(60°)+RFFwPE
4
X
0.85·[X1+XN]
R
-0.85·[X1+XN]·
tan (AngNegRes-90°)
5
X
RFFwPE·tan (ArgLd)
R
RFFwPE
6
X
-0.5·RLdFw·tan (ArgDir)
R
0.5·RLdFw
The table showing test points for phase-to-earth loops is used together with figure
Table 26: Test points for phase-to-phase loops L1–L2
Test point
Value
Comments
1
X
X1
R
0
2
X
0
R
RLdFw
3
X
0.85·X1
R=0.491·X1+0.5 RFFwPP
R
0.85·X1·1/tan(60°)+0.5 RFFwPP
4
X
0.85·X1
R
-0.85·X1·tan (AngNegRes-90°)
5
X
0.5·RFFwPP·tan (ArgLd)
R
0.5·RFFwPP
6
X
-0.5·RLdFw·tan (ArgDir)
R
0.5·RLdFw
The table showing test points for phase-to-phase loops is used together with figure
12.4.6.1
Measuring the operating limit of set values
GUID-B1B7DEB6-7BC3-4A90-8D8F-E4E69B434AFA v3
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)/
FRPSPDIS:x .
3.
to find the operate values for the remaining test points according to
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
117
Commissioning manual
