R
X
RFFwPE
1
3
5
2
4
ArgNegRes
85%
50% of
RLdFw
6
IEC09000734-4-en.vsd
7
60°
)
/
(
loop
W
)
/
(
loop
W
)
1
(
XN
X
+
IEC09000734 V4 EN-US
Figure 35: Operating characteristic for phase selection function, forward direction
single-phase faults
Table 19: Test points for phase-to-earth loop L3-E (Ohm/loop)
Test point
Reach
Value
Comments
1
X
[X1+XN]
XN=(X
0
-X
1
)/3
R
0
2
X
0
R
RLdFw
When RLdFW < RFFwPE
R
RFFwPE
When RLdFwPE > RFFwPE
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]
Can be limited by RFFwPE
R
-0.85·[X1+XN]·
tan (AngNegRes-90°)
5
X
RFFwPE·tan (ArgLd)
Only when RLdFw < RFFwPE
R
RFFwPE
6
X
-0.5·RLdFw·tan (ArgDir)
R
0.5·RLdFw
Table
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
107
Commissioning manual
