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D
A
1 p
–
(
)
Z
×
L
Z
B
+
Z
A
Z
L
Z
B
+
+
-----------------------------------------
=
EQUATION97 V1 EN
(Equation 63)
Thus, the general fault location equation for a single line is:
FA
A
A
L
F
A
I
V
I p Z
R
D
= × ×
+
×
EQUATION1596 V1 EN
(Equation 64)
Table 411:
Expressions for V
A
, I
A
and I
FA
for different types of faults
Fault type:
V
A
I
A
I
FA
AG
V
AA
I
AA
+ K
N
x I
NA
(
)
AA
0 A
3
2
I
I
× D
-
EQUATION1597 V1 EN
BG
V
BA
I
BA
+ K
N
x I
NA
(
)
BA
0 A
3
2
I
I
× D
-
EQUATION1598 V1 EN
CG
V
CA
I
CA
+ K
N
x I
NA
(
)
CA
0 A
3
2
I
I
× D
-
EQUATION1599 V1 EN
ABC, AB, ABG
V
AA
-V
BA
I
AA
- I
BA
D
I
ABA
BC, BCG
V
BA
-V
CA
I
BA
- I
CA
D
I
CBA
CA, CAG
V
CA
-V
AA
I
CA
- I
AA
D
I
CAA
The K
N
complex quantity for zero-sequence compensation for the single line is equal to:
K
N
Z
0L
Z
1L
–
3 Z
1L
×
------------------------
=
EQUATION99 V1 EN
(Equation 65)
D
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
A
, Z
B
and Z
L
is inserted into the
equations, because this is the value used in the algorithm.
For double lines, the fault equation is:
Section 12
1MRK 511 287-UUS A
Monitoring
512
Technical manual
Содержание REC650 ANSI
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