A synchronous electrical machine comprises a plurality of phases and {HEAD ~ detecting means} arranged to detect {TAIL ~ an open circuit fault} in at least one of the phases of the synchronous electrical machine 
arranged to detect
A synchronous electrical machine comprises a plurality of phases and { HEAD ~ detecting means } arranged to detect { TAIL ~ an open circuit fault } in at least one of the phases of the synchronous electrical machine
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH