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

The process of a transformer oil filtering machine involves the removal of impurities, moisture, and gases from transformer oil to restore its dielectric strength and extend the transformer’s lifespan. This is achieved through techniques such as vacuum dehydration, coalescence, and fine filtration. Transformer oil filtering is required when the oil shows signs of contamination, such as increased acidity or reduced insulation properties, often indicated by regular maintenance checks or after a fault event.