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

The procedure for transformer oil testing frequency typically involves annual testing for operational transformers, with more frequent testing (semi-annual or quarterly) for critical applications. Key parameters evaluated include dielectric strength, moisture content, acidity, dissolved gas analysis (DGA), and furan analysis. These tests help assess the oil’s insulation properties, detect potential failures, and ensure the transformer’s reliability and longevity. Regular monitoring is essential for effective maintenance and risk management.