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Contact SupplierTransformer oil is highly refined mineral oil that remains stable at high temperature and has outstanding electrical insulating properties. It is normally obtained by fractional distillation and succeeding treatment of crude petroleum that is why this oil is also known as mineral insulating oil. Transformer oil provides part of the electrical insulation between internal parts in the transformer. It also cools the transformer that it serves as a coolant.Causes of contamination of transformer oil are electrical disturbances and thermal decomposition. Various impurities like moisture, grease, dissolved gases etc. All the impurities present in the transformer oil reduces the breakdown strength of transformer oil, promotes heating, increases the electrical conductivity and decreases the electrical and mechanical strength of insulation system. The contaminants also reduce the transformer efficiency.