6.2.6.2
Phase-to-phase fault
For a phase-to-phase fault, the measured impedance by FDPSPDIS (21) will be according
to equation
2
Vm Vn
ZPHS
In
-
=
- ×
EQUATION1813-ANSI V1 EN
(Equation 30)
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
ANSI05000670-2-en.vsd
X1
R
X
0.5·
RFltFwdPP
Kr·X1
Kr·X1
X1
60 deg
60 deg
0.5·
RFltFwdPP
0.5·
RFltRevPP
0.5·
RFltRevPP
0.5·
RFltRevPP
1
Kr
tan(60 deg)
=
0.5·
RFltFwdPP
)
/
(
phase
W
)
/
(
phase
W
ANSI05000670 V2 EN
Figure 54:
The operation characteristics for FDPSPDIS (21) at phase-to-phase fault
(setting parameters in italic, directional lines drawn as "line-dot-dot-line"),
ohm/phase domain
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
Section 6
1MRK 506 335-UUS A
Impedance protection
134
Technical manual
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