STC Three Phase A.C Synchronous Generator STC Three Phase A.C Synchronous Generator ZONESUN POWER DRICE YOUR WORLD.EUROPE QUALITY ,CHINA PRICE ... excitation system,easy operation and maintenance.The generators are ther-phase,four-wire type,adopted star connection with neutral point, ... The rated line voltage is 400V,phase voltage 230V,frequency 50Hz,power factor 0.8(lag). ...