Simulation Calculation and Analysis of Temperature Field of 35kV Station Transformer Based on Fluid-Solid Coupling Method

Abstract

The reliable operation of substation transformers is very important, but in recent years, there have been many failures caused by insulation damage, which deserves attention. The occurrence of insulation problems is closely related to the internal temperature of the transformer. Therefore, this paper applies the fluid structure coupling method to simulate the temperature field of a 35kV station oil immersed transformer, calculates the temperature distribution law through the transformer loss, and explores the influence law of oil flow velocity and load coefficient on the internal temperature of the transformer, so as to provide a reference for the insulation state evaluation and early defect identification of the station transformer. The calculation results show that the highest temperature of the transformer occurs in the middle and upper part of the middle layer of the high-voltage winding, about one-third from the top, which is 63.85°C; as the inlet oil flow rate increases, the maximum temperature inside the transformer shows a downward trend; as the load factor increases, the maximum temperature inside the transformer shows an upward trend.