What tests are performed in a transformer oil laboratory?

Common lab tests include BDV, moisture by Karl Fischer, acidity, interfacial tension, dielectric dissipation factor, resistivity, viscosity, flash point, density, inhibitor content, dissolved gas analysis, furan analysis, and particle count. Additional tests may include corrosive sulfur, PCB screening, and oxidation stability. Laboratories provide interpretation, trend reports, and recommendations, often aligned with IEC, ASTM, or utility specific standards.