The vibration method has been widely used in the diagnosis of transformer’s mechanical faults. In this paper

the axial vibration characteristics of a transformer winding are analyzed to establish necessary theoretical basis for the study of the vibration method. The axial vibration mechanism of the transformer winding is introduced based on the mass-spring model. A winding vibration test platform based on piezoelectric acceleration sensor is built to explore the axial vibration distribution features of the transformer winding and the influences of load current fluctuation and winding looseness on the distribution features. It is found that the axial vibration of the transformer winding is of approximate U-shape distribution

and the current fluctuation has no obvious influence on the vibration distribution of the winding.With the variation of pre-tightening force of the winding

its vibration distribution varies significantly.