Siemens Siprotec 7UM612 - Page 364

A Appendix
364
7UM61 Manual
C53000-G1176-C127-3
Figure A-8 Unit Connection with Isolated Starpoint: Connection to three current transformers and three voltage
transformers (phase-to-earth voltages) –with series device 7XR61 for rotor circuit injection and with super-
vision of the rotor ground insulation by sensitive earth fault detection; detection of displacement voltage at
open delta winding (e–n).
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