Numerical Calculation of the Electromagnetic Vibration and Noise in Power Transformer Based on the Multi-Field Coupling Method

Abstract

Aiming at the electromagnetic vibration and noise problem of power transformer body, the finite element analysis software ANSYS is used to establish the multi-field coupling calculation model including the electromagnetic field-structure field-sound field in power transformer, and the electromagnetic vibration and noise of power transformer body is numerically calculated and analyzed. Firstly, the magnetostrictive force of the core and the electromagnetic force of the winding are obtained through the electromagnetic field calculation. Then, it is applied to the structural field calculation model as an excitation to obtain the vibration displacement of the transformer body. Finally, the structure field calculation results are imported into the sound field calculation model, and the sound field distribution in the outer space of the transformer and the sound pressure value at the test point are obtained. By comparing with the test results, the effectiveness and accuracy of the method are proved. At the same time, the specific measures to reduce the vibration and noise of the transformer are given, which is of great significance to solve the vibration and noise problem of the transformer.