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1MRK 506 331-UUS A
Commissioning Manual
4
X +
(
1
XN
)
50% of RLdFwd
ANSI09000734 V1 EN
Figure 13:
Operating characteristic for phase selection function, forward direction
single-phase faults
Table 6:
Test points for phase-ground loop CG (Ohm/loop)
Test point
Reach
Value
1
X
[X1+XN]
R
0
2
X
0
R
RLdFwd
R
RFltFwPG
3
X
0.85·[X1+XN]
R
0.85·[X1+XN]
4
X
R
-0.85·[X1+XN]·
tan (AngNegRes-90°)
5
X
RFltFwdPG·tan (LdAngle)
R
RFltFwdPG
6
X
-0,5·RLdFwd·tan (ArgDir)
R
0,5·RLdFwd
Table
6
is used together with figure 13.
W
(
/
phase
)
X
1
85%
5
ArgNegRes
2
7
6
RFltFwdPG
Section 6
Testing functionality
3
LdAngle
60 deg
W
(
/
phase
R
ArgDir
ANSI09000734-1-en.vsd
Comments
XN=(X
-X
)/3
0
1
When RLdFWd < RFltFwPG
When RLdFwdPG > RFltFwPG
R≈0.491·(X1+XN)+RFltFwdPG
Can be limited by RFltFwPG
Only when RLdFwd < RFltFwPG
)
53
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