... excitation system, easy operation and maintenance.The generators are three-phase, four-wire type, adopting star connection with neutral ... point. The rated line voltage is 400V, phase voltage is 230V, frequency is 50Hz. power factor ... . When the rotation speed of prime mover change 3%, load varies in the range of 0~100%, ... air damping: not exceed 90% STC Series Three Phase Synchronous Generator,