What is transformer oil regeneration and when is it needed?

Transformer oil regeneration is a process that restores the insulating properties of degraded transformer oil, typically through methods like vacuum distillation or adsorption. It is needed when the oil shows signs of contamination, such as increased acidity, moisture content, or the presence of dissolved gases, which can compromise the performance and lifespan of the transformer. Regular monitoring of oil quality helps determine the appropriate timing for regeneration to ensure optimal operation.