ABB Relion 670 Series Commissioning Manual page 117

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