Research on temperature field of large capacity bridge arm reactor's busbar based on circuit-magnetic-thermal field coupling calculation

The large capacity dry-type air-core bridge arm reactor in service should bear the composite current with AC and DC at the same time. The aluminum busbar of bridge arm reactor with unreasonable structure design is prone to local overheating, so it is necessary to carry out the temperature field calculation and research of the busbar. In this paper, based on the circuit-magnetic-thermal field coupling principle, the design scheme of busbar is proposed. The loss distribution of the busbar can be obtained through the magnetic field simulation. The magnetic field simulation results are imported into the temperature field calculation software to carry out the temperature field simulation calculation of the busbar. The relationship between the loss and the temperature results of the busbar is calculated by considering the factor such as heat dissipation area of the busbar. According to the actual size of the busbar structure, the simulation calculation of temperature field under different convective heat transfer coefficient of the busbar is carried out, which get the range of convective heat transfer coefficient meeting the engineering requirements. The results of research on this paper will provide a powerful technical means and effective reference for the analysis and solution of the overheating problem about the bridge arm reactor's busbar.