What is the Role of Oil in Immersed Transformers?

Oil-immersed transformers are sealed insulation materials that use insulation oil. Oil-immersed transformers are widely used in the power supply of civil construction and are one of the important equipment in the power supply equipment system. So what is the role of oil in oil-immersed transformers?

As mentioned earlier, oil-immersed transformers use insulation oil as insulation material, so this type of power transformer has insulation effects. Unlike dry-type transformers, the iron core and windings of oil-immersed transformers are immersed in the oil-filled oil tank. Insulation oil has the function of heat dissipation.

The first function of oil in oil-immersed transformers is insulation, serving as the dielectric strength between transformer oil and gas. Immersing insulation material in oil not only improves the dielectric strength, but also prevents the erosion of moisture. The second function of transformer oil is heat dissipation. Transformer oil has a high specific heat and can be used as a coolant. The heat generated during transformer operation will increase the thermal expansion of oil near the iron core and windings. By convection of oil and heat dissipation from the radiator, normal operation of transformer oil can be ensured.