Transformer oil purification is a process to remove sludge, dissolve moisture and dissolved gases from the oil. Transformer oil conditioning may also include to some extent improving the acidity of the oil.
Advantages of transformer oil purification
Transformers are theoretically designed to last 300 years; the limitation to their life span is the deterioration of the insulation paper. Today majority of transformers are operating at a 25 % higher work load than recommended, this leads to gas production and faster deterioration of the insulation paper.