Siemens Siprotec 7UM611 Manual page 362

Multi-functional generator protection relay 7um61 series
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A Appendix
Figure A-6
Busbar System with Low-Ohmic Earthing: CT connections to three voltage transformers (phase-to-
ground voltages) and in each case three current transformers – earth fault detection as differential current
measuring of two CT sets; detection of displacement voltage at broken delta winding (e–n) as an additional
criterion.
362
7UM61 Manual
C53000-G1176-C127-3

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