What is the transformer oil replacement procedure?

The transformer oil replacement procedure involves several key steps. First, ensure the transformer is de-energized and grounded. Next, drain the old oil using a vacuum pump to minimize air exposure. Inspect and clean the transformer components, including the insulation. Then, refill with new, filtered transformer oil, ensuring proper levels and avoiding air pockets. Finally, perform tests to check for moisture and dielectric strength before re-energizing the transformer. Always follow safety protocols and manufacturer guidelines.