Siemens Siprotec 7UM611 Manual page 363

Figure A-7
7UM61 Manual
C53000-G1176-C127-3
Busbar system with high-ohmic, switchable starpoint resistors ,CT connection
to three current transformers and three voltage transformers (phase-to-ground
voltages) –earth fault detection as differential current measuring between star-
point current and summation current measured via toroidal CTs; detection of
displacement voltage at open delta winding (e–n).
A.3 Connection Examples
363