ABB RELION 670 SERIES Applications Manual page 356

Section 8
Impedance protection
350
1
2
60°
8
6
4
3
IEC09000043 V1 EN
Figure 168: Relation between distance protection phase selection (FDPSPDIS) (21)
and impedance zone (ZMQPDIS) (21) for phase-to-ground fault
φloop>60° (setting parameters in italic)
1 FDPSPDIS (phase selection)(21) (red line)
2 ZMQPDIS (Impedance protection zone)(21)
RFltRevPG
3
PHS
4 ( X1 +XN)/tan(60°)
PHS
RFltFwdPG
5
PHS
RFPG
6
ZM
7 X1 +XN
PHS
8 φloop
X1
9 +XN
ZM
X
W
( / loop)
3 4
6
6
8
6
5
1MRK 506 369-UUS -
5
7
60°
R
W
( / loop)
7
IEC09000043_1_en.vsd
Line distance protection REL670 2.2 ANSI
Application manual