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X1
R
X
85%
1
3
5
2
6
4
50% RLdFw
ArgNegRes
0.5·RFFwPP
ArgLd
IEC09000735-2-en.vsd
ArgDir
60°
)
/
(
phase
W
)
/
(
phase
W
7
IEC09000735 V2 EN
Figure 55:
Operating characteristic for phase selection function, forward
direction phase-to-phase faults
Table 22:
Test points for phase-earth loop L3-E (Ohm/loop)
Test point
Value
Comments
1
X
[X1+XN]
XN=(X
0
-X
1
)/3
R
0
2
X
0
R
RLdFw
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
1MRK 504 088-UEN C
Section 13
Verifying settings by secondary injection
123
Installation and commissioning manual
Summary of Contents for RELION RET670
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