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6.2.6.1
Phase-to-ground fault
Index PHS in images and equations reference settings for Phase selection
with load encroachment function FDPSPDIS (21).
( , )
( , )
PHS
n
VA B C
IA B C
Z
=
EQUATION1554 V1 EN
(Equation 25)
where:
n
corresponds to the particular phase (n=1, 2 or 3)
The characteristic for FDPSPDIS (21) function at phase-to-ground fault is according to
figure
. The characteristic has a fixed angle for the resistive boundary in the first
quadrant of 60°.
The resistance RN and reactance XN are the impedance in the ground-return path defined
according to equation
.
0
1
3
R
R
RN
-
=
EQUATION1256 V1 EN
(Equation 26)
0
1
3
X
X
XN
-
=
EQUATION1257 V1 EN
(Equation 27)
Section 6
1MRK 506 335-UUS A
Impedance protection
132
Technical manual
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