What are the standard procedures for testing of transformer oil?

The standard procedures for testing transformer oil include sampling, visual inspection, and laboratory analysis. Key tests involve measuring dielectric strength, moisture content, acidity, and dissolved gas analysis (DGA). Samples should be taken from the transformer under clean conditions to avoid contamination. Tests are conducted according to ASTM D3487 and IEC 60475 standards to ensure the oil meets performance criteria and to assess the transformer’s condition and insulation integrity.