Transformer Overhauling is a comprehensive maintenance procedure that involves the complete disassembly, cleaning, inspection, and repair of a transformer to restore it to its original operating condition. Unlike routine maintenance, which addresses minor issues, overhauling is a more intensive process performed to extend the life of a transformer, often after a failure or as part of a scheduled maintenance program every 5 to 7 years. . The process typically includes draining and testing the old oil, lifting the core and coil assembly for inspection, cleaning all internal components to remove sludge and contaminants, replacing old gaskets and seals, and often, rewinding damaged coils. The transformer is then reassembled, filled with new or filtered oil, and subjected to a battery of final tests to ensure it meets safety and performance standards. This procedure is a cost-effective alternative to replacing the entire unit and is crucial for maintaining the reliability and efficiency of a power system.