DIY electric testing of a transformer's insulation strength can be done using a megohmmeter (megger) to measure insulation resistance between windings and between windings and the core. Before starting, ensure the transformer is de-energized, properly grounded, and fully discharged. Connect the megger probes to the test points and apply the test voltage as per the transformer’s rating. A high resistance reading (in megohms) indicates good insulation, while low resistance suggests possible insulation failure. Always follow safety precautions and manufacturer guidelines, as incorrect testing can be dangerous. For critical transformers, professional testing is recommended to ensure accuracy and safety.
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