When both the first and second connection changing switches are closed, {HEAD ~ the interconnection} of {TAIL ~ the stator windings} becomes a parallel Y connection in which the phase difference produced is 60° 
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When both the first and second connection changing switches are closed , { HEAD ~ the interconnection } of { TAIL ~ the stator windings } becomes a parallel Y connection in which the phase difference produced is 60 °
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH