Megger testing of transformers is a vital insulation resistance test used to assess the condition of a transformer’s winding insulation. This test involves applying a high DC voltage using a megger (insulation tester) to measure the resistance between windings and between windings and earth. A high resistance value indicates good insulation, while a low value may signal deterioration, moisture, or contamination. Regular megger testing helps prevent insulation failure, enhances safety, and ensures reliable transformer performance. It is commonly performed during commissioning, routine maintenance, or after repairs. Accurate megger testing supports early fault detection and extends the lifespan of the transformer.
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