What are the steps in the transformer oil filtration process?

The transformer oil filtration process involves several key steps: First, the oil is drained from the transformer and pre-filtered to remove large particles. Next, it undergoes a vacuum dehydration process to eliminate moisture and dissolved gases. Following this, fine filtration is performed using filter cartridges to remove smaller contaminants. Finally, the treated oil is tested for quality and reintroduced into the transformer, ensuring optimal performance and longevity.