Appendix
A.3 Connection Examples
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
430
Figure A-9 Current transformer connections to three current transformers, ground current from additional
summation current transformer – preferably for effectively or low-resistance grounded networks
Important: Grounding of the cable shield must be effected at the cable side
Note: The switchover of the current polarity (address 201) also reverses the polarity of the current input IN!
Figure A-10 Current transformer connections to two current transformers - additional cable-type current
transformer for sensitive ground fault detection - only for isolated or resonant-grounded net-
works
Important: Grounding of the cable shield must be effected at the cable side
Note: The switchover of the current polarity (address 201) also reverses the polarity of the current input INs!
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