Isolating means is arranged to isolate {HEAD ~ the at least one phase} of the synchronous electrical machine with {TAIL ~ the fault} 
with
Isolating means is arranged to isolate { HEAD ~ the at least one phase } of the synchronous electrical machine with { TAIL ~ the fault }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL