ABB RELION RET670 - Page 371

R
X
60°
60°
1
2
3
5
4
6
6
6
6
6
6
7
7
W( /phase)
IEC09000257_1_en.vsd
W( / phase)
5
3
8
4
8
IEC09000257 V1 EN-US
Figure 171: Relation between distance protection (ZMQPDIS) (21) and FDPSPDIS
(21) characteristic for phase-to-phase fault for φline>60° (setting
parameters in italic)
1 FDPSPDIS (phase selection)(21) (red line)
2 ZMQPDIS (Impedance protection zone) (21)
3 0.5 ·
RFltRevPP
PHS
4
( )
60tan °
PHS
X1
5 0.5 ·
RFltFwdPP
PHS
6 0.5 · RFPP
Zm
7 X1
PHS
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 365
Application manual