What are the methods for transformer oil purification in South Africa?

The methods for transformer oil purification in South Africa typically include vacuum dehydration, which removes moisture and gases, and clay filtration, which eliminates particulate contaminants and improves oil quality. Additionally, some facilities utilize centrifugal separation to effectively separate water and sludge from the oil. These methods ensure that transformer oil maintains its insulating properties and extends the operational life of power transformers.