ABB RET670 Commissioning Manual page 104

Section 10
Testing functionality by secondary injection
X1
ANSI09000735 V1 EN-US
Figure 23: Operating characteristic for phase selection function, forward direction phase-
Table 25:
Test point
1
2
3
4
5
6
The table showing test points for phase-to-ground loops is used together with figure 22.
98
W
(
X
1
4
85%
ArgNegRes
6
50% RLdFwd
0.5·RFltFwdPP
to-phase faults
Test points for phase-to-ground loop CG (Ohm/loop)
Value
X [X1+XN]
R 0
X 0
R RLdFwd
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 RFltFwdPG·tan (LdAngle)
R RFltFwdPG
X -0,5·RLdFwd·tan (ArgDir)
R 0,5·RLdFwd
/ phase )
3
LdAngle
5
60°
2
7
ArgDir
ANSI09000735-1-en.vsd
Comments
XN=(X
0
R≈0.491·(X1+XN)+RFFwPE
W
( / phase )
R
-X )/3
1
Commissioning manual
1MRK 504 154-UUS B