ABB REL650 - Page 147

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 67: Relation between distance protection ZQMPDIS (21) and FDPSPDIS
(21) for phase-to-ground fault φloop>60° (setting parameters in italic)
1
FDPSPDIS (21) (red line)
2 ZQMPDIS(21)
3 RFltRevPG
PHS
4 ( X1
PHS
+XN)/tan(60°)
5 RFltFwdPG
PHS
6 RFPE
Zm
RFPG
ZM
7 X1
PHS
+XN
8 φloop
9 X1
ZM
+XN
1MRK 506 334-UUS A Section 6
Impedance protection
141
Application manual