GROUND FAULT DETECTION

摘要

The present invention relates to a ground fault detection arrangement for a synchronous three-phase electrical machine, and an electrical system comp rising a ground fault detection arrangement and a synchronous three-phase el ectrical machine. The ground fault detection arrangement injects an off-nomi nal frequency voltage between a neutral point of the synchronous three-phase electrical machine and ground and measure resultant currents to detect a gr ound fault.