ABB REL650 Technical Manual page 634

Section 14
Monitoring
628
I
FA
× × ×
U I p Z ------- - R
= +
A A L F
D
A
EQUATION98 V1 EN-US
Table 442: 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
N
equal to:
Z – Z
0L 1L
----------------------- -
K
=
N ×
3 Z
1L
EQUATION99 V1 EN-US
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
into the equations, because this is the value used in the algorithm.
For double lines, the fault equation is:
I
FA
× × ×
U I p Z ------- - R
= +
A A 1L
D
A
EQUATION100 V1 EN-US
Where:
I is a zero sequence current of the parallel line,
0P
Z is a mutual zero sequence impedance and
0M
D is the distribution factor of the parallel line, which is:
A
, 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
×
I Z
+
F 0P 0M
1MRK 506 382-UEN A
I
FA
+ K x I
3
N NA
´ D I
-- -
2
EQUATION110 V1 EN-US
+ K x I
N NA
3
´ D I (
-- -
2
EQUATION111 V1 EN-US
+ K x I
N NA
3
´ D I
-- -
2
EQUATION112 V1 EN-US
- I
L2A
EQUATION113 V1 EN-US
- I
L3A
EQUATION114 V1 EN-US
- I
L1A
EQUATION115 V1 EN-US
, Z and Z is inserted
A B L
Line distance protection REL650 2.2 IEC
Technical manual
(Equation 82)
( )
– I
L 1 A 0A
)
– I
L2A 0A
( )
– I
L3A 0A
DI
L 1 L 2 A
DI
L2L3A
DI
L3L1A
(Equation 83)
(Equation 84)