For the flow and heat transfer processes of large-scale oil-immersed transformer’s internal fluid-solid coupling

the nonlinear partial differential equations of flow-solid-thermal coupling flow and heat transfer can be transferred based on FVM method into conservation equations of integral form on the grid unit

which applies the Gauss divergence formula to get the integral conservation equation of control body in the form of borders. Finally

the temperature distribution of core

winding and transformer oil by applying PISO algorithm

verified the reliability and accuracy of FVM method is verified by comparison of the calculated results with the measured data. Also

the temperature distribution of transformer winding and oil is gotten by the application of FVM simulation. The optimal control strategy of fan is realized by comparative analysis. This has a certain significance reference for the intelligent control of large oil-immersed power transformer’s fan.