Siemens Siprotec 7UM612 - Page 368

A Appendix
368
7UM61 Manual
C53000-G1176-C127-3
Figure A-12 Asynchronous motor:Connection to three voltage transformers (phase-to-earth voltages, usually from the
busbar); Displacement voltage detection at broken delta winding, three current transformers; Earth fault di-
rection detection by toroidal CTs
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