What is the transformer oil processing procedure?

The transformer oil processing procedure involves several key steps: first, the oil is filtered to remove particulate contaminants. Next, it undergoes dehydration to eliminate moisture, often using vacuum distillation or centrifugation. Following this, the oil is treated with clay or activated carbon to remove dissolved gases and polar compounds. Finally, the processed oil is tested for dielectric strength and other properties before being reintroduced into the transformer, ensuring optimal performance and longevity.