What is the purpose of the oil pan in transformers?

The purpose of the oil pan in transformers is to provide a reservoir for transformer oil, which serves as both an insulating and cooling medium. The oil pan allows for the expansion and contraction of the transformer oil due to temperature changes, ensuring that the oil remains at an optimal level for effective heat dissipation and electrical insulation. This design is crucial for maintaining the operational efficiency and longevity of power transformers.