20KV oil immersed transformer

Insulation. Transformer oil has a higher dielectric strength than air, which can improve the insulation strength between the windings and other electrical components, while protecting them from moisture erosion.
Heat dissipation. Because transformer oil has a large specific heat capacity, it is used as a coolant to help dissipate heat generated during transformer operation and keep the transformer within a safe operating temperature range.
Arc Cancellation. On oil circuit breakers and transformer on-load voltage regulator switches, transformer oil can quickly extinguish arcs as they are generated, increasing the safety of the equipment.
Mechanical support and corrosion protection. Transformer oil can provide certain mechanical support, enhance the mechanical strength of the transformer, and extend the service life of the oil by adding corrosion inhibitors and antioxidants.
Reduce partial discharge and gas generation. Transformer oil absorbs and dilutes gases generated in the windings and other components, reducing the risk of partial discharges and thus extending the service life of the equipment.
Provides pressure equalization. In the event of a change in pressure within a transformer, oil can help maintain pressure balance and prevent excessive internal pressure.