Megger testing of a transformer is an insulation resistance test performed using a megohmmeter (commonly known as a Megger) to assess the condition of the transformer's insulation system. This test applies a high DC voltage between windings and between windings and ground to measure resistance, typically in megohms (MΩ). High insulation resistance indicates good insulation, while low values may signal moisture, contamination, or insulation breakdown. Megger testing is crucial during commissioning, routine maintenance, or after repairs to ensure safety, reliability, and compliance with standards. It helps prevent insulation failures, extending the transformer’s service life and reducing the risk of costly downtime.
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