Appendix
A-157SA522 Manual
C53000-G1176-C119-2
Figure 1-10 Current connections to three current transformers and a separate neutral current
transformer (summation transformer) for earth current — preferred for effectively
or low-resistive earthed networks
Important! Cable shield grounding must be done on the cable side!
Note: Change of Address 0201 setting changes polarity of 3I
0
Current
Input, i.e. terminal Q7 must be connected to that CT terminal point-
ing in the same direction as the starpoint of the phase current CTs
(towards “Line side” in this diagramm)
Panel surface mounted
Flush mounted/cubicle
L1 L2 L3
k
l
I
4
I
L1
I
L2
I
L3
Q1
Q3
Q5
Q2
Q4
Q6
Q7Q8
k
l
25
24
23
47
50
49
48
22
7SA522
Housing size
1
/
2
Panel surface mounted
Flush mounted/cubicle
L1 L2 L3
k
l
I
4
I
L1
I
L2
I
L3
Q1
Q3
Q5
Q2
Q4
Q6
Q7Q8
k
l
50
49
48
97
100
99
98
47
7SA522
Housing size
1
/
1
Important! Cable shield grounding must be done on the cable side!
Note: Change of Address 0201 setting changes polarity of 3I
0
Current
Input, i.e. terminal Q7 must be connected to that CT terminal point-
ing in the same direction as the starpoint of the phase current CTs
(towards “Line side” in this diagramm)
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