Research on Temperature of Dry Hollow Reactor Based on Multiphysics Simulation

Based on electromagnetic and heat transfer effects, a finite element model of a dry-type air-core reactor is established in this paper. The conductive properties of the epoxy resin for the reactor's sealing insulation at different ambient temperatures are tested using the frequency domain dielectric spectroscopy method. The finite element simulation based on ANSYS software is used to perform magnetic-fluid-thermal multiphysics coupling calculations on the traditional dry-type air-core reactor. The losses of the insulation are calculated considering material properties, and the distribution of magnetic field, fluid field, and temperature field in the reactor is analyzed. The research results show that, in terms of magnetic field intensity, the maximum and minimum magnetic induction intensities of the reactor are 1.85 T and 0.0018 T, respectively. The radial distribution of magnetic induction intensity is symmetrically distributed with the center of the bushing as the axis of symmetry. The magnetic induction intensity is higher at the spider arm position. The axial magnetic field of the reactor is symmetrically distributed along the central axis. By comparing the calculated losses obtained from analytical methods with the simulated results, it is found that the accuracy of loss calculation can be ensured. At the same ambient temperature, the fluid at 0 ℃ reduces the temperature rise of the reactor by approximately 6%, and the highest temperature is concentrated mainly at the contact welding points between the spider arm and sealing of the reactor.