Phase-To-Phase Fault - ABB Relion 670 Series Technical Reference Manual

1MRK505222-UUS C
6.10.2.2
Technical reference manual

Phase-to-phase fault

For a phase-to-phase fault, the measured impedance by FRPSPDIS (21) is according to
equation 29.
-
Vm Vn
=
ZPHS
- ×
2 In
EQUATION1813-ANSI V1 EN
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 103.
0.5·FRvPP
0.5·RFRvPP
R1PP
0.5·RFRvPP
IEC09000634 V1 EN
Figure 171: The operation characteristic for FRPSPDIS (21) at phase-to-phase
fault (directional lines are drawn as "line-dot-dot-line")
X (ohm/phase)
R1PP
0.5·RFFwPP
0.5·RFFwPP
X1
0.5·RFFwPP
Section 6
Impedance protection
(Equation 69)
X1
R (ohm/phase)
IEC09000634-1-en.vsd
331