Siemens SIPROTEC 7UT63 series - Page 533

A.3 Connection Examples
533
7UT613/63x Manual
C53000-G1176-C160-2
Figure A-24 Connection example 7UT613 for a three-phase power transformer with current transformers between star-
point and earthing point, additional connection for high-impedance protection; I
Z3
connected to the high-
sensitivity input