What is the procedure for oil transformer testing and what parameters are evaluated?

The procedure for oil transformer testing involves several key steps: first, perform visual inspections for leaks and corrosion; next, conduct insulation resistance tests and power factor measurements. Additionally, Dissolved Gas Analysis (DGA) is crucial for assessing the condition of the insulating oil. Key parameters evaluated include dielectric strength, moisture content, acidity, and the presence of gases like hydrogen and ethylene, which indicate potential faults. Regular testing ensures optimal transformer performance and longevity.