... 2.easy operate and maintainance 3.cheap Best Sale!!!ST/STC generator low rpm alternator ... salient pole rotating field self excitation and constant voltage type.The alternator is adopted with high quality ... with neutral point. The rated line voltage is 400V,phase voltage 230V,frequency 50Hz, power factor 0 ... .8~1.0, the generators offer constant voltage when sudden change(increase or decrease) of load ...