What is the role of transformer oil in 3-phase oil immersed distribution transformers?

The role of transformer oil in 3-phase oil immersed distribution transformers is crucial for both insulation and cooling. Transformer oil provides electrical insulation between live components and the tank, preventing electrical breakdown. Additionally, it absorbs and dissipates heat generated during operation, maintaining optimal temperature levels. The oil also helps to prevent moisture ingress and oxidation, ensuring the longevity and reliability of the transformer.