Megger testing of a transformer, also known as insulation resistance testing, is performed to assess the condition of the insulation between transformer windings and between windings and the ground. Using a Megger instrument, a high DC voltage is applied, and the resistance is measured in megohms. High insulation resistance indicates healthy insulation, while low readings may suggest moisture, contamination, or insulation degradation. This test is crucial during routine maintenance, after installation, or following repairs to ensure safety and prevent electrical failures. Regular Megger testing helps detect potential issues early, ensuring the reliability, longevity, and safe operation of the transformer.
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