Transformer oil is petroleum, which is a fractionation product of petroleum. Its main components are alkanes, naphthenic saturated hydrocarbons, aromatic unsaturated hydrocarbons and other compounds, commonly known as Fangpeng oil, light yellow transparent liquid. Transformer oil is a mineral oil obtained from natural oil through distillation and refining. It is a mixture of liquid natural hydrocarbons with pure, stable, low viscosity, good insulation and good cooling property obtained from the lubricating oil fraction in oil after acid and alkali refining. The role of transformer oil is as follows:
1. It mainly plays the role of heat dissipation and cooling during operation;
2. Insulate and maintain the winding;
3. The arc suppression function is played at the high-voltage lead and the contact point of the tap changer to prevent the generation of corona and arc discharge.