ABB RET670 Commissioning Manual page 94

Section 10
Testing functionality by secondary injection
X +
( 1
ANSI09000734 V2 EN-US
Figure 16: Operating characteristic for phase selection function, forward direction single-
Table 19:
Test point
1
2
3
4
5
6
Table 19
88
X
1
4
85%
XN )
ArgNegRes
6
50% of RLdFwd
RFltFwdPG
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
0.85·[X1+XN]
X
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 16.
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
( )
W
loop
/
R
-X )/3
0 1
Commissioning manual
1MRK 504 154-UUS B