China transformers, single phase transformer, three phase transformer

QZB series auto-transformer is applied to unfrequent starting of three-phase squirrel-cage induction motor which is AC 50HZ,rate input voltage 380V,power is 15kW-450kW to improve the affect to the subtransmission network when the motor starting .The transformer often input 65%, 80% and can work in short time when it’s starting.The starting time should less than 20s in an hour.