What is the process of transformer oil filters and when is it required?

The process of transformer oil filtration involves removing impurities, moisture, and gases from the insulating oil to enhance the transformer’s performance and longevity. This is typically achieved through techniques such as vacuum filtration, centrifugal separation, or adsorption. Transformer oil filters are required when the oil shows signs of degradation, such as increased moisture content or reduced dielectric strength, often indicated by routine testing or during maintenance schedules to ensure optimal operation and prevent failures.