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