How is dielectric oil dehydrated and degassed?

Dielectric oil is dehydrated and degassed using a vacuum purification process. The oil is first heated to reduce viscosity, making it easier to remove water and gases. It is then exposed to a vacuum, where the low pressure causes moisture and dissolved gases to evaporate. The dehydrated and degassed oil is recirculated back into equipment like transformers, ensuring optimal insulation and cooling properties.