Due to the physical and chemical properties of natural ester oil

the temperature rise of transformer with natural ester oil as cooling medium is higher than that of mineral oil transformer with the same structure. In order to solve the problem that the temperature rise of natural ester oil transformer is high and there is no reliable analytical calculation formula

we take an SWFZ-40000/132 natural ester transformer as a research object to establish a refined simulation model of electromagnetic field and fluid field of transformer. Moreover

we accurately calculate the loss of transformer

analyze the influence of axial oil duct height on the temperature rise of transformer winding

and reasonably design the transformer. The main insulation strength of transformer is checked to ensure the electrical safety of transformer. Finally

the correctness of theoretical analysis is verified by the test of transformer.