Electromagnetic vibration noise analysis of transformer windings and core


Analyses of transformer electromagnetic vibration noise are presented during this study. A finite component model is established which combines transient electromagnetic field analysis, mechanical field analysis and acoustic analysis to calculate the sound pressure level of the radiated noise around the transformer. Transient electromagnetic field analysis is performed to induce the Lorentz, reluctance magnetic forces and magnetostriction according to Maxwell theory and virtual displacement principle. Mutual influence of strain and magnetisation has been thought of. The main frequency components of harmonic electromagnetic excitations are analysed by Fourier transformation so as to carry out the harmonic response analysis and obtain the nodes displacements of the windings and core. The noise distribution is additional calculated by acoustic analysis primarily based on the achieved vibration information. Comparison of calculated results and measured data verifies that the combined noise calculating model is applicable for transformer noise prediction.

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