What methods are used for transformer oil testing and what parameters are evaluated?

Transformer oil testing employs several methods, including Dissolved Gas Analysis (DGA), Furan Analysis, and dielectric strength testing. Key parameters evaluated include moisture content, acidity, dissolved gases (like hydrogen and methane), furan compounds (indicating paper insulation degradation), and the oil’s dielectric strength. These tests help assess the condition of the transformer and predict potential failures, ensuring reliable operation and maintenance.