Research on the Relation between Load Coefficient and Hot Spot Temperature of Oil-immersed Power Transformer

Hot spot temperature of oil-immersed power transformer winding is an important parameter affecting the insulation life-span of transformer, which is closely related to the load coefficient of transformer. In this paper, the finite element simulation method is used to simulate and analyze the hot spot temperature of a 220 kV oil-immersed three-phase power transformer, and the temperature distribution of the transformer winding under rated load is obtained. The relationship between different load coefficients and winding hot spot temperature is researched by changing the load coefficient of transformer.