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Insulation Gas distribution transformer testing Siemens

How To Test A Transformer - Top Electrical Engineers· Insulation resistance of a new transformer should be greater than 1 Giga ohm, and the old transformer should greater than 300 Mega ohms. In summary, if the transformer's insulation resistance test between high voltage windings and the transformer body is less than 300 Mega Ohm indicates the weakness of insulation.

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