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

The procedure for electrical transformer oil testing involves sampling the oil, followed by laboratory analysis. Key parameters evaluated include dielectric strength, moisture content, acidity, dissolved gas analysis (DGA), and furan analysis. Dielectric strength assesses insulation capability, while moisture content indicates potential degradation. Acidity measures oil degradation, DGA identifies fault gases, and furan analysis evaluates paper insulation condition. Regular testing ensures transformer reliability and longevity.