The β is derived according to equation
for the mho circle and φ is the angle between
the voltage and current.
X
R
ArgDir
ArgNegRes
ZPP
ZRevPP
VAB
ϕ
IAB
en06000469_ansi.ep
ANSI06000469 V1 EN
Figure 121:
Operation characteristic for reverse phase A-to-B fault
Phase-to-ground fault
Mho
The measuring of ground faults uses ground-return compensation applied in a
conventional way. The compensation voltage is derived by considering the influence
from the ground-return path.
For a ground fault in phase A, the compensation voltage Vcomp can be derived, as
shown in figure
A
loop
pol
Vcomp
V
I
Z
=
-
×
EQUATION1793-ANSI V1 EN
(Equation 36)
1MRK505222-UUS C
Section 6
Impedance protection
249
Technical reference manual
Содержание Relion 670 series
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