ABB REG316 4 Series - Page 88

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-50
Example:
The compensation for the currents of a three-winding trans-
former Yd5y0 is as follows:
s1 = Y
s2 = d5
s3 = y0
CBC results from Table 3.5.1.2, i.e. the
compensation matrix
for winding 1
= C = (1 -1 0)
(see Table 3.5.1.1)
with an amplitude factor of 1/ 3
compensation matrix
for winding 2
= B = (-1 0 0) (see Table 3.5.1.1)
with an amplitude factor of 1
compensation matrix
for winding 3
= C = (1 -1 0)
(see Table 3.5.1.1)
with an amplitude factor of 1/ 3
The function currents then become:
Function currents (calculated)
Currents measured at
the c.t's
Winding 1:
I
I
I
r
s
t
1
1
1
1
3
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
=
110
01 1
10 1
1
1
1
-
-
-
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
I
I
I
R
S
T
Winding 2:
I
I
I
r
s
t
2
2
2
1
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
=
-
-
-
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
10 0
010
00 1
2
2
2
I
I
I
R
S
T
Winding 3:
I
I
I
r
s
t
3
3
3
1
3
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
=
110
01 1
10 1
3
3
3
-
-
-
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
æ
è
ç
ç
ç
ö
ø
÷
÷
÷
I
I
I
R
S
T