What is the transformer oil filtration procedure?

The transformer oil filtration procedure involves several steps to remove impurities and moisture from the oil. Initially, the transformer oil is pumped through a filtration system that includes a series of filters and a vacuum chamber. This process helps to separate water, particulate matter, and gases from the oil. After filtration, the oil is tested for dielectric strength and other properties to ensure it meets the required specifications before being returned to the transformer.