What diagnostics are performed in a transformer oil analysis laboratory?

Laboratories perform dielectric tests, moisture analysis, acidity measurement, interfacial tension, resistivity, and color assessment. Advanced diagnostics include Dissolved Gas Analysis, furan analysis for paper aging, particle count, inhibitor content, and corrosive sulfur testing. These diagnostics identify internal overheating, arcing, insulation deterioration, and contamination. Results are compared with standards and historical data to assess transformer condition and recommend maintenance or corrective actions.