ABB REL650 series Technical Manual page 674

Section 14
Monitoring
668
( ) Z ×
1 p – + Z
L B
-----------------------------------------
D =
A
Z + Z + Z
A L B
EQUATION97 V1 EN
Thus, the general fault location equation for a single line is:
I
= × × + ×
V I p Z FA R
A A L F
D
A
EQUATION1596 V1 EN
Table 494: Expressions for V
Fault type: V
A
AG V
BG V
CG V
ABC, AB, ABG V
BC, BCG V
CA, CAG V
The K complex quantity for zero-sequence compensation for the single line is equal to:
N
Z Z
–
0L 1L
----------------------- -
K =
N ×
3 Z
1L
EQUATION99 V1 EN
DI 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
equations, because this is the value used in the algorithm.
For double lines, the fault equation is:
, I and I for different types of faults
A A FA
I
A
I + K
AA AA
I + K
BA BA
I + K
CA CA
-V I - I
AA BA AA
-V I - I
BA CA BA
-V I - I
CA AA CA
1MRK 506 335-UUS A
I
FA
x I
(
N NA
3 × D
2
EQUATION1597 V1 EN
x I
(
N NA
3
× D
2
EQUATION1598 V1 EN
x I
(
N NA
3 × D
2
EQUATION1599 V1 EN
DI
BA
ABA
DI
CA CBA
DI
AA CAA
, Z and Z is inserted into the
A B L
Technical manual
(Equation 103)
(Equation 104)
)
-
I I
AA 0 A
)
-
I I
BA 0 A
)
-
I I
CA 0 A
(Equation 105)