What is oil sludging in transformer?

Oil sludging in Transformers refers to the accumulation of solid particles and degraded oil byproducts that form as a result of thermal stress, oxidation, and contamination. This sludge can hinder the flow of insulating oil, reduce the cooling efficiency, and impair the dielectric properties of the transformer oil. Consequently, oil sludging can lead to overheating, reduced operational efficiency, and potential failure of the transformer if not addressed promptly. Regular maintenance and oil testing are essential to prevent and manage this issue.