Appendix
A.3 Connection Examples
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
667
Figure A-15 Current connections to 3 current transformers with separate earth current transformer
(summation current transformer) prefered for solidly or low-resistive earthed systems.
Important! The cable shield must be grounded 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 IE or IEE. Therefore the con-
nections of S1 and S2 must be exchanged at Q8 and Q7 when using a toroidal current transformer.
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