when transformer oil filtration is required?

Transformer oil filtration is required when the insulating oil in a transformer becomes contaminated with moisture, particulate matter, or other impurities. This contamination can degrade the oil’s dielectric strength and overall performance, leading to potential failures. Regular filtration is essential during maintenance, after repairs, or when a transformer is taken out of service for an extended period. Additionally, filtration is crucial when oil testing indicates high levels of dissolved gases or other contaminants.