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Fault locator (FLOC)
For a single line, the value is equal to:
(
) Z
⋅
1 p
–
+
Z
L
B
-----------------------------------------
D
=
A
Z
Z
Z
+
+
A
L
B
Thus, the general fault location equation for a single line is:
I
FA
⋅
⋅
⋅
U
I
p Z
------- - R
=
+
A
A
L
F
D
A
7DEOH ([SUHVVLRQV IRU 8$ ,
)DXOW W\SH
8$
L1-N
U
L1-N
U
L2-N
U
L1-L2-L3, L1-L2,L1-
U
L2-N
The K
complex quantity for zero-sequence compensation for the single line is equal
N
to:
Z
Z
–
0L
1L
----------------------- -
K
=
⋅
N
2 Z
1L
∆ I is the change in current, that is the current after the fault minus the current before the
fault.
In the following, the positive sequence impedance for Z
the equations, because this is the value used in the algorithm.
DQG ,
IRU GLIIHUHQW W\SHV RI IDXOWV
$
)$
,
$
I
L1A
L1A
I
L1A
L1A
I
L2A
L2A
-U
I
L1A
L2A
L1A
,
)$
3
×
∆ I
(
-- -
2
+ K
x I
3
N
NA
×
∆ I
(
-- -
2
+ K
x I
N
NA
3
-- - ∆ I
×
(
2
- I
L2A
, ZB and Z
is inserted into
A
L
&KDSWHU
0RQLWRULQJ
(Equation 65)
(Equation 66)
)
I
–
L1 A
0A
)
–
I
L1 A
0A
)
–
I
L2A
0A
∆I
L 1L2A
(Equation 67)
331
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