ABB REL650 series Technical Manual page 675

1MRK 506 335-UUS A
Technical manual
I
= × × + ×
V I p Z FA
A A 1L
D
A
EQUATION1600 V1 EN
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
( ) × (
1 p – Z
---------------------------------------------------------------------------- -
D =
A
×
2 Z
A
EQUATION101 V1 EN
The K compensation factor for the double line becomes:
N
Z – Z Z
0L 1L 0M
×
K = ----------------------- - + ---------------- -
N × ×
3 Z 3 Z
1L 1L
EQUATION102 V1 EN
From these equations it can be seen, that, if Z
equation for a single line is obtained. Only the distribution factor differs in these two cases.
Because the D distribution factor according to equation
A
general equation 106 can be written in the form:
2
× ×
p – p K + K – K R =
1 2 3 F
EQUATION103 V1 EN
Where:
V Z
= +
K A B
1
× +
I Z Z Z
A L L ADD
EQUATION1601 V1 EN
æ
V Z
= ×
K A B
ç
2
× +
I Z Z Z
è
A L L ADD
EQUATION1602 V1 EN
+ ×
R I Z
F 0P 0M
)
+ Z + Z + Z
A A L B B
×
Z 2 Z
+ +
L B
I
0P
-------
I
0A
= 0, then the general fault location
0m
0
+
1
ö
+
1
÷
ø
Section 14
Monitoring
(Equation 106)
(Equation 107)
104 or 106 is a function of p, the
(Equation 108)
(Equation 109)
(Equation 110)
669