Transformer overhauling is a comprehensive process of refurbishing and restoring a transformer to its optimal working condition. It includes dismantling, thorough inspection, rewinding, core repairs, insulation replacement, oil filtration or replacement, bushing checks, cooling system servicing, and reassembly. The process helps in removing contaminants, repairing faults, and improving efficiency, ensuring a longer lifespan and reliable power distribution. Overhauling is performed according to IEC and IEEE standards, minimizing the risk of failures, overheating, and energy losses. It is a cost-effective solution compared to replacement, providing enhanced performance and reducing downtime in industrial, commercial, and utility applications.