Siemens SIPROTEC Manual page 669

Line differential protection with distance protection
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Figure A-17
Current connections to three current transformers and earth current from the star-point current of an
earthed power transformer (for directional earth fault protection)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Appendix
A.3 Connection Examples
669

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