Comparative analysis of multi-physical fields of vegetable and mineral insulating oil power transformer

This article calculates and studies the oil flow distribution, temperature distribution and electric field distribution of vegetable and mineral Insulating oil in the low-voltage winding of the transformer with finite element method (FEM). The results show that the maximum flow rates of vegetable Insulating oil and mineral oil are located on the side wall of low-voltage winding at 0.1, 0.3 and 0.6 m/s inlet velocities, and the maximum flow rate of mineral oil is higher. In addition, the increase of inlet flow rate will also cause the temperature inside the low voltage (LV) winding to drop. Due to the low viscosity of mineral oil, its heat transfer efficiency is higher. In addition, at the same flow rate, the pressure of mineral oil in the low-voltage winding is smaller, which is also due to the low viscosity and strong fluidity of mineral oil.