Siemens siprotec 7SA522 - Page 565

Appendix
A-177SA522 Manual
C53000-G1176-C119-2
Figure 1-12 Current connections to three current transformers but earth current from the star-point current of a power
transformer (for directional earth fault protection)
Housing size
1
/
2
Line
L1
L2
L3
Transformer
Panel surface mounted
Flush mounted/cubicle
I
4
I
L1
I
L2
I
L3
Q1
Q3
Q5
Q2
Q4
Q6
Q7Q8
25
24
23
47
50
49
48
22
7SA522
k
l
Housing size
1
/
1
Line
L1
L2
L3
Transformer
Panel surface mounted
Flush mounted/cubicle
I
4
I
L1
I
L2
I
L3
Q1
Q3
Q5
Q2
Q4
Q6
Q7Q8
50
49
48
97
100
99
98
47
7SA522
k
l