Abstract: Aiming at the common vibration and noise problems of transformers under DC disturbance,considering the current situation that vibration and noise are difficult to observe,an electromagnetic-mechanical-acoustic multi-physics coupling method is proposed in this paper. The threedimensional finite element electromagnetic-vibration model of transformer is constructed and the electromagnetic and vibration parameters of current-carrying coil are calculated based on the electromagnetic-mechanical coupling principle,and the spatial sound pressure distribution of winding is solved by acoustic wave model. Next,taking the Yd-connected three-phase threecolumn transformer as an example,the vibration and noise changes of the winding under various DC disturbances are studied. The corresponding relationship between winding force,vibration acceleration and noise is analyzed,and the variation law is summarized. The dynamic simulation experiment platform is built to measure the vibration parameters of transformer winding. Compared with the simulation data,the correctness of the method is verified. On this basis,the virtual mapping relationship function between DC disturbance and noise anomaly is proposed,and the instability criterion is formulated to realize the purpose of using observable electrical information to characterize unobservable anomaly characteristics, so as to provide technical support for abnormal monitoring and protection of transformer bias effect.