Multi-physical field coupled analysis of heavy-current irregular buabar

Abstract

A study was conducted on multi-physical field coupled analysis of a certain model of heavy-current switchgear irregular busbar. At first, a 2-D model was established for the conventional rectangular busbar, and the finite element method (FEM) was applied in the electromagnetic field calculation to obtain the distribution of current density and power losses of the busbar conductor. Then, sequential coupled method was adopted to introduce power losses as the heat source into the thermal-fluid field of the rectangular busbar, to determine the proportions of heat release through convection and heat release through radiation of the busbar conductor. Considering the deficiencies that larger material consumption and low current density of the rectangular busbar, the irregular busbar is designed by taking influence of the proximity effect and the skin effect into account. Finally, the electromagnetic field analysis was taken as the basis in the structure field analysis to obtain the vibration distribution of the irregular busbar. According to the comparison between the calculation results and the measurements in test, the numeric calculation was proved to be reliable, and the method of multi-physical field coupled analysis could be taken as a reference for other types of busbar.