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330
Fault locator (FLOC)
F
A
Z
pZ
I
A
A
U
A
)LJXUH )DXOW RQ WUDQVPLVVLRQ OLQH IHG IURP ERWK HQGV
From figure 180 it is evident that:
⋅ ⋅
⋅
U
=
I
p Z
+
I
R
A
A
L
F
F
Where:
I
is the line current after the fault, that is, pre-fault current plus current
A
change due to the fault,
I
is the fault current and
F
is a relative distance to the fault
p
The fault current is expressed in measurable quantities by:
I
F A
------- -
I
=
F
D
A
Where:
I
is the change in current at the point of measurement, terminal A and
FA
D
is a fault current-distribution factor, that is, the ratio between the fault cur-
A
rent at line end A and the total fault current.
L
(1-p).Z
I
L
L
B
I
F
R
F
B
Z
B
xx01000171.vsd
&KDSWHU
0RQLWRULQJ
(Equation 63)
(Equation 64)
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