Research on Finite Element Model of Air-core Reactor Based on Magnetic-thermal Coupling Simulation

Abstract

In actual operation, the air-core reactor is prone to overheating of windings or metal structures under high current operation. Usually, the design temperature rise margin of the reactor is too small, and it is easy for the reactor to overheat, resulting in burning accident. According to the actual dimensions of dry-type air-core reactor wires, insulation materials, ventilation ducts and other components, the finite element simulation graph is established, By endowing the material properties of each part of the reactor, meshing, and based on the combined calculation method of magnetic field and circuit, the reactor loss under typical working conditions is calculated. Through the joint mathematical calculation method of reactor loss and fluid-temperature field, considering the effects of reactor heat conduction, natural convection and radiation, the magnetic field and temperature distribution law of reactor body winding and upper and lower supports are obtained. Finally, the difference between the simulation value and the experimental value of the body temperature is compared, and the convection heat transfer law of the body and the axial and radial temperature distribution law of the package are revealed.