ABB RET670 - Page 260

R
X
60°
60°
1
2
3
5
6
6
6
6
7
7
8
8
4
IEC09000043_1_en.vsd
W( / loop)
W( / loop)
4
3 5
IEC09000043 V1 EN
Figure 109: Relation between distance protection ZMQPDIS (21) and FDPSPDIS
(21) for phase-to-ground fault φloop>60° (setting parameters in italic)
1
FDPSPDIS (21) (red line)
2 ZMQPDIS(21)
3 RFltRevPG
PHS
4 ( X1
PHS
+XN)/tan(60°)
5 RFltFwdPG
PHS
6 RFPG
ZM
7 X1
PHS
+XN
8 φloop
9 X1
ZM
+XN
Reactive reach
Section 3 1MRK504116-UUS C
IED application
254
Application manual