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 36: Operating characteristic for phase selection function, forward direction
phase-to-phase faults
Table 20: Test points for phase-to-phase loops L1–L2 (Ohm/phase)
Test point
Reach
Value
Comments
1
X
X1
R
0
2
X
0
R
RLdFw
When RLdFw < 0,5·RFFwPP
R
0,5·RFFwPP
When RLdFw > 0,5·RFFwPP
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
Can be limited by RFFwPP
R
-0.85·X1·tan (AngNegRes-90°)
5
X
0.5·RFFwPP·tan (ArgLd)
Only when RLdFW < RFFwPP
R
0.5·RFFwPP
6
X
-0.5·RLdFw·tan (ArgDir)
R
0.5·RLdFw
.
12.4.2.1
Measuring the operating limit of set values
M13906-73 v6
Procedure:
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
108
Commissioning manual
