Siemens Siprotec 7UM611 Manual page 366

Multi-functional generator protection relay 7um61 series
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A Appendix
Figure A-10
Rotor earth fault protection – with series device 7XR61 for injection of a rated-frequency voltage into the
rotor circuit if the sensitive earth current input is used.
366
7UM61 Manual
C53000-G1176-C127-3

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