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

The procedure for testing an oil transformer involves several key steps: visual inspection, insulation resistance testing, power factor testing, and transformer oil analysis. Parameters evaluated include insulation resistance, power factor, dielectric strength, moisture content, and dissolved gas analysis (DGA). These tests assess the transformer’s operational integrity, insulation condition, and potential fault indicators, ensuring reliable performance and longevity in service. Regular testing is crucial for preventive maintenance and safety.