What is the purpose of transformer oil in power transformers?

The purpose of transformer oil in power transformers is to provide electrical insulation and cooling. Transformer oil acts as a dielectric fluid, preventing electrical discharges and maintaining the insulation integrity of the transformer. Additionally, it dissipates heat generated during operation, ensuring optimal performance and longevity of the transformer. The oil also helps in preventing oxidation and moisture ingress, further enhancing the reliability of the power transformer.