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Section 11
Testing functionality by secondary injection
Table 23:
Test point
1
2
3
4
5
6
Table
23
IEC09000735 V3 EN-US
Figure 26:
104
Test points for phase-to-earth loop L3-E (Ohm/loop)
Reach
Value
X
[X1+XN]
R
0
X
0
R
RLdFw
R
RFFwPE
X
0.85·[X1+XN]
R
0.85·[X1+XN]·1/tan(60°)+RFFwPE
X
0.85·[X1+XN]
R
-0.85·[X1+XN]·
tan (AngNegRes-90°)
X
RFFwPE·tan (ArgLd)
R
RFFwPE
X
-0.5·RLdFw·tan (ArgDir)
R
0.5·RLdFw
is used together with figure 25.
X
1
4
85%
X1
ArgNegRes
50% RLdFw
0.5·RFFwPP
Operating characteristic for phase selection function, forward direction phase-to-
phase faults
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Comments
XN=(X
When RLdFW < RFFwPE
When RLdFwPE > RFFwPE
R≈0.491·(X1+XN)+RFFwPE
Can be limited by RFFwPE
Only when RLdFw < RFFwPE
W
(
/
phase
)
5
60°
2
7
6
ArgDir
1MRK 505 378-UEN Rev. K
-X
)/3
0
1
3
ArgLd
W
(
/
phase
)
R
IEC09000735-3-en.vsd
Line differential protection RED670
Commissioning manual
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