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

The procedure for testing transformer oil insulation involves several key steps: sampling the oil, performing physical and chemical tests, and evaluating electrical properties. Key parameters evaluated include dielectric strength, moisture content, acidity, and dissolved gas analysis (DGA). Dielectric strength assesses the oil’s ability to withstand electrical stress, while moisture content indicates potential degradation. Acidity measures the presence of corrosive compounds, and DGA identifies fault conditions within the transformer. Regular testing ensures optimal performance and longevity of the transformer.