Dynamic Balance Research of Shaft System for 300MW Turbo-generator Set

According to vibration problems occurring in operation of 300MW turbo-generator sets, an analysis has been carried out on vibration phenomenon, feature, mechanism and the causes, while various countermeasures for on-site dynamic balancing summarized. Results show that vibration disturbance exits in 300MW turbine unit medium-pressure rotors due to asymmetric structures and should be taken into consideration in site dynamic balance; the abnormal vibration occurring in low-pressure rotor of some turbine units are caused by insufficient rigidity of supports for relevant bearing seats, which may be handled by fine dynamic balance on site; the vibration on generator rotor presents two-order mode and three-order mode and the dynamic balance for generator and excitation rotor should be according to actual instance on site.