Analysis of the Thermal State of a Heating Element of Transformer Type

Abstract

The solution of a simulation problem and the analysis of three-dimensional temperature field in a heating element of transformer type are considered. The design of a three-phase heating element with a spatial magnetic system is presented. The features of model construction using ANSYS software package are described. The results of simulation of temperature field in the heating element with the power of 25 kW are shown and analyzed. It is revealed that the temperature field in the area of primary winding is distributed unevenly and there are regions of local overheating. A heat removal from these regions is carried out by two main paths. The heat removal intensity and the distribution of heat fluxes depend on the current density in the jumper, which closes the elements of the secondary winding. Taking this into account, recommendations for selecting the electromagnetic loads in the active parts of the heating element and improving the design of electrical equipment are presented. To justify the modes of operation of the heating element as a part of heating unit of a stand-alone heat-supply system, the interrelation between the flow rate of the heat-transfer agent and the power of the heating element was revealed, which makes it possible to limit the maximum temperature in areas of local overheating and prolong the operation life of electrical equipment.