Siemens siprotec 7SA6 User Manual page 711

L1
L1
Figure A-21 Current connections to three current transformers with separate earth current transformer
(summation current transformer or
7SA6 Manual
C53000-G1176-C133-1
15
14
13
k
l
27
L2 L3
k
l
Important! Cable shield grounding must be done on the cable side!
Note: Change of Address 0201 setting changes polarity of 3I
Input, i.e. terminal Q7 must be connected to that CT terminal
pointing in the same direction as the starpoint of the phase current
CTs (towards "Line side" in this diagram)
(50) 25
(49) 24
(48) 23
k
l
(97) 47
L2 L3
k
Important! Cable shield grounding must be done on the cable side!
l
Note: Change of Address 0201 setting changes polarity of 3I
Input, i.e. terminal Q7 must be connected to that CT terminal
pointing in the same direction as the starpoint of the phase current
CTs (towards "Line side" in this diagram)
Housing size
cable core balance
Panel surface mounted
Flush mounted/cubicle
I
L1
Q1
I
L2
Q3
I
L3
Q5
I
4
Q8
7SA6
1
Housing size /
3
Panel surface mounted
Flush mounted/cubicle
I
L1
Q1
I
L2
Q3
I
L3
Q5
I
4
Q8
7SA6
1
/ (figures in brackets relating to size
2
current tranformer)
Q2 30
Q4 29
Q6 28
Q7 12
Current
0
Q2 50 (100)
Q4 49 (99)
Q6 48 (98)
Q7 22 (47)
Current
0
1
/ )
1
Appendix
A-35