Which transformer oil tests are required for condition assessment and asset management?

Core tests include DGA, moisture content, breakdown voltage, acidity, interfacial tension, dissipation factor, and resistivity. For deeper asset management, furan analysis tracks paper aging, and particle count assesses cleanliness. Inhibited oil requires inhibitor content monitoring. Specific tests like corrosive sulfur screening may be used depending on fleet risk. Trending results and correlating with loading and temperature data enables condition based maintenance, prioritization of interventions, and early detection of developing thermal faults, partial discharge, or arcing conditions.