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 41: Operating characteristic for phase selection function, forward direction
single-phase faults
X1
R
X
85%
1
3
5
2
6
4
50% RLdFw
ArgNegRes
0.5·RFFwPP
ArgLd
IEC09000735-3-en.vsd
ArgDir
60°
)
/
(
phase
W
)
/
(
phase
W
7
IEC09000735 V3 EN-US
Figure 42: Operating characteristic for phase selection function, forward direction
phase-to-phase faults
Table 25: Test points for phase-to-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
Table continues on next page
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
116
Commissioning manual
