How is dehydration of transformer oil performed?

Dehydration of transformer oil is performed using a process called vacuum dehydration. This involves heating the oil to reduce its viscosity and then applying a vacuum to remove moisture and dissolved gases. The oil is circulated through a dehydration unit equipped with a moisture-absorbing material, such as silica gel or molecular sieves, which captures water molecules. This process ensures the transformer oil maintains its insulating properties and prolongs the life of the transformer.