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The Transformer Oil Tan Delta Test is conducted to assess the insulation quality of transformer oil. It measures the dissipation factor or tan delta, which indicates the power factor of the insulating material. High tan delta values suggest potential issues with the insulation, helping identify and prevent transformer failures.
The recommended value for tan delta or dissipation factor in used transformer oil as per IEC (International Electrotechnical Commission) standards is typically below 0.5%. Higher values may indicate potential issues with the insulation system of the transformer. Regular testing of transformer oil helps assess its condition and detect any deterioration in the insulation properties.