What is the correct transformer oil filtration procedure?

The correct transformer oil filtration procedure involves several key steps: First, ensure the transformer is de-energized and isolated. Next, connect the filtration unit to the oil inlet and outlet. Begin the filtration process by circulating the oil through the filtration system, which typically includes a vacuum chamber and fine filters to remove moisture, particulate matter, and gases. Monitor the oil’s dielectric strength and moisture content throughout the process, and repeat as necessary until the desired quality is achieved. Finally, safely return the filtered oil to the transformer.