Regeneration restores oil by removing oxidation byproducts, acids, and polar contaminants that simple filtration cannot eliminate. Plants typically combine dehydration and degassing with adsorption media such as activated clay or proprietary columns, followed by polishing filtration. This can raise IFT, lower acidity, improve dielectric losses, and reduce sludge precursors. Regeneration is used when oil is aged but the transformer is still serviceable, helping extend life. After treatment, inhibitor levels may be adjusted and acceptance tests are repeated to confirm recovery.
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