ABB Relion 650 Series Technical Manual page 483

1MRK 506 326-UUS B
Table 420: Expressions for V
Fault type:
AG
BG
CG
ABC, AB, ABG
BC, BCG
CA, CAG
The K complex quantity for zero-sequence compensation for the single line is equal to:
N
Z
0L
----------------------- -
K =
N
3 Z
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
because this is the value used in the algorithm.
For double lines, the fault equation is:
=
V I p Z
A A
EQUATION1600 V1 EN-US
Where:
I
0P
Z
0M
D
A
The K compensation factor for the double line becomes:
N
Line distance protection REL650
Technical manual
, I and I
A A FA
V
A
V
AA
V
BA
V
CA
V -V
AA BA
V -V
BA CA
V -V
CA AA
– Z
1L
×
1L
I
× × + × +
FA R I
1L F 0P
D
A
is a zero sequence current of the parallel line,
is a mutual zero sequence impedance and
is the distribution factor of the parallel line, which is:
( ) × (
1 p – Z + Z +
A A L
---------------------------------------------------------------------------- -
D =
A
×
2 Z + Z + 2 Z
A L
EQUATION101 V1 EN-US
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for different types of faults
I
A
I + K x I
AA N NA
I + K x I
BA N NA
I + K x I
CA N NA
I - I
AA BA
I - I
BA CA
I - I
CA AA
, Z
A
×
Z
0M
)
Z + Z
B B
×
B
I
FA
( )
3 × D -
I I
2
AA 0 A
EQUATION1597 V1 EN-US
( )
3 × D -
I I
2
BA 0 A
EQUATION1598 V1 EN-US
( )
3
× D -
I I
2
CA 0 A
EQUATION1599 V1 EN-US
DI
ABA
DI
CBA
DI
CAA
and Z is inserted into the equations,
B L
Section 13
Monitoring
(Equation 87)
(Equation 88)
477