X1
R
X
85%
1
3
5
2
6
4
50% RLdFwd
ArgNegRes
0.5·RFltFwdPP
LdAngle
ANSI09000735-1-en.vsd
ArgDir
60°
)
/
(
phase
W
)
/
(
phase
W
7
ANSI09000735 V1 EN
Figure 32:
Operating characteristic for phase selection function, forward direction
phase-to-phase faults
Table 26:
Test points for phase-to-ground loop CG (Ohm/loop)
Test point
Value
Comments
1
X
[X1+XN]
XN=(X
0
-X
1
)/3
R
0
2
X
0
R
RLdFwd
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]
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
The table showing test points for phase-to-ground loops is used together with figure
.
Section 11
1MRK 504 165-UUS -
Testing functionality by secondary injection
130
Transformer protection RET670 2.2 ANSI
Commissioning manual
Summary of Contents for RELION RET670
Page 1: ...RELION 670 SERIES Transformer protection RET670 Version 2 2 ANSI Commissioning manual...
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