Siemens SIPROTEC 7UT63 series - Page 532

A Appendix
532
7UT613/63x Manual
C53000-G1176-C160-2
Figure A-23 Connection example 7UT613 as high-impedance protection on a transformer
winding with earthed starpoint (the illustration shows the partial connection of
the high-impedance protection); I
Z3
is connected to the high-sensitivity input