Megger testing of a transformer is a vital insulation resistance test performed to assess the condition of insulation between transformer windings and between windings and the ground. Using a megohmmeter (Megger), a high DC voltage is applied, typically ranging from 500V to 5kV, depending on the transformer's rating. The test identifies insulation degradation, moisture ingress, or contamination, which can lead to breakdowns or faults. Results are measured in megohms; higher resistance indicates better insulation. This preventive maintenance step is crucial for ensuring transformer reliability, longevity, and safety. It’s typically performed before commissioning and during routine maintenance checks.
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