ABB REB650, Technical Manual

Page: 311 / 504

D
A
1 p –
( )
Z
×
L
Z
B
+
Z
A
Z
L
Z
B
+ +
----------------------------------------- =
EQUATION97 V1 EN
(Equation 60)
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 61)
Table 248: 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 62)
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:
1MRK 505 277-UUS C
Section 12
Monitoring
305
Technical Manual