Research on vibration and noise of power transformer cores including magnetostriction effects

An important source of transformer noise is magnetostrictive vibration of the magnetic core. In order to calculate the vibration due to magnetostriction (MS), magneto-mechanical strong coupled model for power transformer cores including anisotropic reluctivity tensor and MS is founded based on the energy variation principle. Using the proposed model, the magnetic flux and vibration of three-phase three-column transformer cores with no-load are calculated by the finite element method. And on the basis of the vibration calculation, the acoustic field around the transformer is analyzed. In order to verify the model, vibration and noise were studied experimentally. Numerical calculation results together with experimental results confirm the validity of the proposed method. Furthermore, this method which could help prediction the noise level in transformer design step and seek new denoise methods has great potential in the future application.