What is transformer oil purification and why is it necessary?

Transformer oil purification is the process of removing impurities, such as water, particulate matter, and dissolved gases, from transformer oil to enhance its insulating properties and thermal conductivity. This process is necessary to maintain the operational efficiency and longevity of power transformers, as contaminated oil can lead to electrical failures, overheating, and reduced dielectric strength. Regular purification ensures reliable performance and minimizes the risk of transformer outages.