Transformer Overhauling is a comprehensive, scheduled maintenance procedure to restore a Transformer to its optimal operating condition and extend its life. This process typically involves a thorough internal and external inspection, including dismantling the unit to assess components like the core and windings. The key steps include cleaning the core and coil assembly, replacing worn-out or damaged parts such as gaskets and bushings, and purifying or replacing the insulating oil. A crucial part of overhauling is performing extensive electrical tests to ensure the transformer's insulation integrity and overall performance before it is reassembled and put back into service.