Temperature Rising Analysis of Dry-type Reactor Based on Multi-physical Coupled-field Method

Abstract

To study the temperature-rising characteristics of the windings of the dry-type reactor, a three-dimensional (3D) finite element (FE) simulation model of electromagnetic-fluid-temperature coupling of the reactor is constructed by using the method of the multi-physical field coupled modeling. Firstly, based on the magnetic-circuit coupled theory, the electromagnetic analytical model of the reactor is created and analyzed, and the heat density per unit volume of the reactor is obtained. Then, based on the heat transfer principle of fluid-temperature coupling, taking the heat density per unit volume of the reactor as the heat source, the 3D model of the reactor with fluid-temperature coupling is analyzed by the finite volume method, and the distribution of the internal temperature of the reactor is obtained. From the simulation results of the reactor, the temperature in the upper region is higher than that in the lower region, and the temperature of both sides is lower than that of the middle region. The change regulations of the temperatures in the different encapsulations are basically the same. The temperature gradually increases from the bottom to the top, and the maximum temperature locates at approximately 90% of the axial height of the reactor. The research results provide reference for structure modification, temperature-rising monitoring and overheating fault diagnosis of the reactor.