Megger testing of transformers, also known as insulation resistance testing, is a crucial diagnostic procedure used to assess the condition of a transformer's insulation system. Performed using a megohmmeter (commonly called a Megger), this test applies a high DC voltage between windings and between windings and the ground to measure insulation resistance. High resistance indicates good insulation, while low resistance may suggest moisture ingress, aging, or insulation breakdown. Megger testing is typically done during commissioning, routine maintenance, or after repairs. It helps prevent failures, ensures safety, and extends the lifespan of the transformer by identifying potential insulation issues early.
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