How does a transformer oil purification system work?

A transformer oil purification system works by removing impurities, moisture, and gases from the oil to restore its insulating and cooling properties. The process typically involves several steps:

Heating: The oil is heated to lower its viscosity, making it easier to filter and process.
Vacuum Dehydration: The oil is subjected to a vacuum, which removes dissolved water and gases. This step is crucial for preventing electrical breakdowns caused by moisture.
Filtration: The oil is passed through fine filters that remove solid particles, sludge, and other contaminants.
Degassing: Any remaining dissolved gases are extracted in a vacuum chamber, improving the oil’s dielectric strength.
Recirculation: The purified oil is recirculated back into the transformer to ensure even distribution and maintain optimal insulation and cooling.