ABB Relion 650 Series Technical Manual page 96

Section 5
Impedance protection
=
ZPHS
EQUATION1813-ANSI V1 EN-US
Vm is the leading phase voltage, Vn the lagging phase voltage and In the phase current in the
lagging phase n.
The operation characteristic is shown in figure 43.
60 deg
0.5·RFltRevPP
ANSI05000670 V2 EN-US
Figure 43: The operation characteristics for FDPSPDIS (21) at phase-to-phase fault (setting
In the same way as the condition for phase-to-ground fault, there are current conditions that have
to be fulfilled in order to release the phase-to-phase loop. Those are according to equation
equation 10.
<
3I
0
EQUATION2109-ANSI V1 EN-US
90
-
Vm Vn
- ×
2 In
0.5·RFltRevPP
Kr·X1
0.5·RFltFwdPP
0.5·RFltRevPP
Kr·X1
0.5·RFltFwdPP
parameters in italic, directional lines drawn as "line-dot-dot-line"), ohm/phase
domain
IMinPUPG
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W
( / phase )
X
0.5·RFltFwdPP
X1
60 deg
(
R
X1
1
=
Kr
tan(60 deg)
ANSI05000670-2-en.vsd
W
/ phase )
Line distance protection REL650
1MRK 506 326-UUS B
(Equation 8)
9 or
(Equation 9)
Technical manual