Abstract: The noise of three-phase low voltage and heavy current busbar bridge system is studied. First, electromagnetic field is calculated by using edge finite element method. Then, the finite element and the boundary element method are combined together to analyze the vibration and acoustic characteristics of the system by using node electromagnetic forces as load. Based on the analysis, methods are proposed to reduce the noise. The results of numerical simulations and experiments show that the noise can be reduced effectively by using these methods.

Key words: Boundary element, Busbar bridge, Edge finite element, Low voltage and heavy current, Radiated sound field