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Heat dissipation performance analysis and structural parameter optimization of oil-immersed transformer based on flow-thermal coupling finite element method

In this paper, a coupled flow-thermal field simulation model is established
 based on the parameters of the transformer. Then the distribution of the
 flow and thermal fields are obtained. The results show that oil backflow
 occurs to varying degrees at the top and bottom of the transformer. In
 addition, with the formation of backflow, the hot spot temperature of the
 transformer increases. Through the combination of orthogonal experiments and
 finite element method, the geometric structure of winding oil passage is
 selected as the optimization variable. The law between the winding structure
 and the maximum temperature is acquired by means of range and variance
 analysis, and the optimal parameters are obtained. The hot spot temperature
 is reduced by 34.27 K compared to the pre-optimization period, which is a
 guideline for the design of transformers.