What are transformer oil dryers used for in power transformers?

Transformer oil dryers are used for in power transformers to remove moisture and impurities from the insulating oil. Moisture in transformer oil can significantly reduce its dielectric strength and lead to insulation failure. By utilizing a transformer oil dryer, the oil is heated and passed through a drying agent, effectively lowering the water content and enhancing the overall performance and longevity of the power transformer.