
where
V
pol
is the polarizing voltage (memorized VA for Phase A-to- ground fault)
Z
loop
is the loop impedance, which in general terms can be expressed as
(
)
1
1
Z +ZN
1
Z
KN
=
× +
EQUATION1799 V1 EN
(Equation 37)
where
Z
1
is the positive sequence impedance of the line (Ohm/phase)
KN
is the zero-sequence compensator factor
The angle β between the Vcomp and the polarize voltage Vpol for a A-to-ground fault is
(
)
A
A
arg V
I
IN KN ZPE
arg(Vpol)
b =
-
+
×
×
-
é
ù
ë
û
EQUATION1592 V1 EN
(Equation 38)
where
V
A
is the phase voltage in faulty phase A
I
A
is the phase current in faulty phase A
I
A
is the phase current in faulty phase A
IN
is the zero-sequence current in faulty phase A (3I0)
KN
EQUATION1593 V1 EN
Z0-Z1
3 Z1
×
EQUATION1594 V1 EN
the setting parameter for the zero sequence compensation consisting of the
magnitude
KN and the angle KNAng.
V
pol
is the 100% of positive sequence memorized voltage V
A
V
pol
is the 100% of positive sequence memorized voltage V
A
Section 6
1MRK505222-UUS C
Impedance protection
250
Technical reference manual
Содержание Relion 670 series
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