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332
Fault locator (FLOC)
For double lines, the fault equation is:
I
FA
⋅ ⋅
⋅
------- - R
U
=
I
p Z
+
A
A
1L
D
A
Where:
I
is a zero sequence current of the parallel line,
0P
Z
is a mutual zero sequence impedance and
0M
D
is the distribution factor of the parallel line, which is:
A
D
A
Because the D
distribution factor according to equation 66 or 69 is a function of p, the
A
general equation 68 can be written in the form:
2
⋅
⋅
p
p K
K
K
R
–
+
–
1
2
3
F
Where:
U
Z
A
B
--------------- -
-------------------------- -
K
=
+
⋅
1
I
Z
Z
Z
+
A
L
L
A DD
U
Z
A
B
⋅
K
-------------- - -
-------------------------- -
=
⋅
2
I
Z
Z
Z
+
A
L
L
A DD
I
Z
Z
+
F A
A
B
⋅
K
--------------- -
-------------------------- -
=
⋅
3
I
Z
Z
+
Z
A
L
1
A DD
⋅
+
I
Z
F
0P
0M
(
)
⋅
(
)
1 p
Z
Z
Z
–
+
+
A
A L
B
---------------------------------------------------------------------------- -
=
⋅
⋅
2 Z
+
Z
+
2 Z
A
L
B
0
=
+
1
1
+
1
+
Z
+
B
&KDSWHU
0RQLWRULQJ
(Equation 68)
(Equation 69)
(Equation 70)
(Equation 71)
(Equation 72)
(Equation 73)
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