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

1MRK505222-UUS C
6.10.2.1
Technical reference manual
PHSEL = AG*1+BG*2+CG*4+AB*8+BC*16+CA*32

Phase-to-ground fault

Index PHS in images and equations reference settings for Phase
selection, quadrilateral characteristic with settable angle (FRPSPDIS,
21).
VA B C ( , )
Z =
n
PHS
IA B C ( , )
EQUATION1554 V1 EN
where:
n corresponds to the particular phase (n=1, 2 or 3)
The characteristic for FRPSPDIS (21) function at phase-to-ground fault is according to
figure 102. The characteristic has a settable angle for the resistive boundary in the first
quadrant of 70°.
The resistance RN and reactance XN are the impedance in the ground-return path
defined according to equation
-
R PE 0 R PE 1
=
RN
3
EQUATION-2125 V1 EN
-
R 0 R 1
=
RN
3
EQUATION1256 V1 EN
-
X 0 X 1
=
XN
3
EQUATION1257 V1 EN
27 and equation 28.
Section 6
Impedance protection
(Equation 64)
(Equation 65)
(Equation 65)
(Equation 66)
329