ABB Relion 670 series - Page 117

R
X
RFltFwdPG
1
3
)1( XNX +
5
2
4
ArgNegRes
85%
50% of RLdFwd
6
ANSI09000734-2-en.vsd
)
/(
loop
W
)/(
loop
W
7
ANSI09000734 V2 EN-US
Figure 27: Operating characteristic for phase selection function, forward direction single-phase
faults
Table 22: Test points for phase-to-ground loop CG (Ohm/loop)
Test point
Reach Value Comments
1 X [X1+XN] XN=(X
0
-X
1
)/3
R 0
2 X 0
R RLdFwd When RLdFWd < RFltFwPG
R RFltFwPG When RLdFwdPG > RFltFwPG
3 X 0.85·[X1+XN] R≈0.491·(X1+XN)+RFltFwdPG
R
4 X
0.85·[X1+XN]
Can be limited by RFltFwPG
R -0.85·[X1+XN]·
tan (AngNegRes-90°)
5 X RFltFwdPG·tan (LdAngle) Only when RLdFwd < RFltFwPG
R RFltFwdPG
6 X -0,5·RLdFwd·tan (ArgDir)
R 0,5·RLdFwd
Table 22 is used together with figure 27.
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 111
Commissioning manual
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