Oil immersed transformers are petroleum based liquids that have the potential for combustion and have environmental drawbacks. However, due to the excellent performance and low cost of transformer oil, the vast majority of power transformers still use transformer oil as an insulation and cooling medium, which is a key equipment for power transmission. Oil immersed transformers use oil as the insulation and heat dissipation medium, effectively isolating the electrical components from the external environment and ensuring long-term stable operation. Its main structure consists of iron core, winding, insulation structure, etc. Oil immersed transformers have various characteristics, such as large capacity, high stability, and good heat dissipation performance. Suitable for power transmission and distribution, it is of great significance to ensure the safe and stable operation of electricity. It plays an indispensable role in the power system, ensuring efficient and stable transmission of electrical energy, and providing stability for various loads.