ABB RED670 - Page 126

X1
R
X
85%
1
3
5
2
6
4
50% RLdFw
ArgNegRes
0.5·RFFwPP
ArgLd
IEC09000735-3-en.vsd
ArgDir
60°
)/( phaseW
)/( phaseW
7
IEC09000735 V3 EN-US
Figure 26: Operating characteristic for phase selection function, forward
direction phase-to-phase faults
Table 23: Test points for phase-to-phase loops L1–L2 (Ohm/phase)
Test point Reach Value Comments
1 X X1
R 0
2 X 0
R RLdFw When RLdFw < 0,5·RFFwPP
R 0,5·RFFwPP When RLdFw > 0,5·RFFwPP
3 X 0.85·X1 R=0.491·X1+0.5 RFFwPP
R 0.85·X1·1/tan(60°)+0.5 RFFwPP
4 X 0.85·X1 Can be limited by RFFwPP
R -0.85·X1·tan (AngNegRes-90°)
5 X 0.5·RFFwPP·tan (ArgLd) Only when RLdFW < RFFwPP
R 0.5·RFFwPP
6 X -0.5·RLdFw·tan (ArgDir)
R 0.5·RLdFw
Table 23 is used together with figure 26.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
120 Line differential protection RED670 2.2 IEC
Commissioning manual