Appendix
A.3 Connection Examples
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
388
Figure A-14 Current transformer connections to two phase currents and two ground currents;
IN/INs – ground current of the line, IG2 – ground current of the transformer starpoint
Important! Grounding of the cable shield must be effected at the cable's side
For busbar-side grounding of the current transformer, the current polarity of the device is changed via address
0201. This also reverses the polarity of current input IN/INs. When using a cable-type current transformer, the
connection of k and l at Q8 and Q7 must be changed.
Figure A-15 High-impedance differential protection for a grounded transformer winding (
showing the partial connection for the high-impedance differential protection)
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