ABB REC650 Technical Manual page 483

1MRK 511 287-UEN A
Technical manual
Thus, the general fault location equation for a single line is:
I
FA
× × ×
------- - R
U = I p Z +
A A L F
D
A
EQUATION98 V1 EN
Table 411: Expressions for U
Fault type: U
L1-N U
L2-N U
L3-N U
L1-L2-L3, L1-L2,L1-L2- U
N
L2-L3, L2-L3-N U
L3-L1, L3-L1-N U
The K complex quantity for zero-sequence compensation for the single line is equal
N
to:
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
the 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 A
I
L1A L1A
I
L2A L2A
I
L3A L3A
-U I
L1A L2A L1A
-U I
L2A L3A L2A
-U I
L3A L1A L3A
Section 12
Monitoring
I
FA
+ K x I
N NA 3
´ D I
-- -
2
EQUATION110 V1 EN
+ K x I
N NA
3
´ D I (
-- -
2
EQUATION111 V1 EN
+ K x I
N NA
3
´ D I
-- -
2
EQUATION112 V1 EN
- I
L2A
EQUATION113 V1 EN
- I
L3A
EQUATION114 V1 EN
- I
L1A
EQUATION115 V1 EN
, Z and Z is inserted into
A B L
(Equation 64)
( )
I
–
L 1 A 0A
)
– I
L2A 0A
( )
– I
L3A 0A
DI
L 1 L 2 A
DI
L2L3A
DI
L3L1A
(Equation 65)
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