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FA
A
A
1L
F
0P
0M
A
I
V
I p Z
R
I
Z
D
= × ×
+
×
+
×
EQUATION1600 V1 EN
(Equation 66)
Where:
I
0P
is a zero sequence current of the parallel line,
Z
0M
is a mutual zero sequence impedance and
D
A
is the distribution factor of the parallel line, which is:
D
A
1 p
–
(
)
Z
A
Z
A L
Z
B
+
+
(
)
Z
B
+
×
2 Z
A
Z
L
2 Z
B
×
+
+
×
-----------------------------------------------------------------------------
=
EQUATION101 V1 EN
The K
N
compensation factor for the double line becomes:
K
N
Z
0L
Z
1L
–
3 Z
1L
×
------------------------
Z
0M
3 Z
1L
×
-----------------
I
0P
I
0A
-------
×
+
=
EQUATION102 V1 EN
(Equation 67)
From these equations it can be seen, that, if Z
0m
= 0, then the general fault location
equation for a single line is obtained. Only the distribution factor differs in these two cases.
Because the D
A
distribution factor according to equation
can be written in the form:
p
2
p K
1
K
2
K
3
R
F
×
–
+
×
–
0
=
EQUATION103 V1 EN
(Equation 68)
Where:
A
B
1
A
L
L
ADD
V
Z
K
1
I Z
Z
Z
=
+
+
×
+
EQUATION1601 V1 EN
(Equation 69)
A
B
2
A
L
L
ADD
V
Z
K
1
I Z
Z
Z
=
×
+
×
+
æ
ö
ç
÷
è
ø
EQUATION1602 V1 EN
(Equation 70)
1MRK 511 287-UUS A
Section 12
Monitoring
513
Technical manual
Содержание REC650 ANSI
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