Transformer Oil Fltration is a Maintenance process that purifies the insulating oil in a transformer. Over time, the oil can become contaminated with moisture, dissolved gases, and solid particles, which can reduce its dielectric strength and cooling efficiency. The filtration process, often using a vacuum purification machine, heats the oil to remove water and gases, while physical filters remove solid impurities. This restores the oil's insulating properties and extends the transformer's lifespan by preventing breakdowns and insulation degradation.