Siemens SIPROTEC 7SD610 - Connection Examples; Current Transformer Connection Examples; A.3 Connection Examples

Appendix
A.3 Connection Examples
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
379
A.3 Connection Examples
A.3.1 Current Transformer Connection Examples
Figure A-3 Current connections to three current transformers with a starpoint connection for earth current
(residual 3I0 neutral current), normal circuit layout
Figure A-4 Current connections to three current transformers with separate earth current transformer
(summation current transformer or toroidal current transformer)
Important! The cable shield must be earthed on the cable side.
In case of an earthing of the current transformers on the busbar side, the current polarity of the device is
changed via the address 0201. This also reverses the polarity of the current input I4.