ABB RELION 670 Series Applications Manual page 284

Section 7
Impedance protection
3
IEC09000043 V1 EN-US
Figure 157: Relation between distance protection phase selection (FDPSPDIS) and
1 FDPSPDIS (phase selection)(red line)
2 ZMQPDIS (Impedance protection zone)
3 RFltRevPG
X1
4 (
PHS
RFltFwdPG
5
6 RFPG
X1
7
PHS
8 φloop
X1
9
ZM
Reactive reach
The reactive reach in forward direction must as minimum be set to cover the measuring zone
used in the Teleprotection schemes, mostly zone 2. Equation
minimum recommended reactive reach.
X1
PHS
EQUATION1309 V1 EN-US
278
3
1
6
2
60°
8
6
4
impedance zone (ZMQPDIS) for phase-to-earth fault φloop>60° (setting
parameters in italic)
PHS
+XN)/tan(60°)
PHS
ZM
+XN
+XN
³ ×
1.44 X1
Zm
X
W
( / loop)
4 5
6
60°
8
W
( / loop)
6
5
IEC09000043_1_en.vsd
1MRK 504 152-UEN B
7
R
7
258 and equation 259
Application manual
M13142-9 v4
gives the
(Equation 258)