... `insulation class B ST/STC single/three-phase alternator/generator(1)ST single-phasesynchronous ... Three-phase A.C. Synchronous GeneratorS The generators are widely used in town, countryside,worksites, mountain and pasture districts as electric power ... three-phase, four-wire type, adopted star connection with neutral point. The rated line voltage is 400V,phase voltage 230V,frequency 50Hz, power ...