Winding resistance testing of a transformer is an essential diagnostic procedure used to assess the condition of the transformer windings. It involves applying a low DC current to each winding and measuring the resulting voltage to calculate resistance using Ohm’s law. This test detects issues such as shorted turns, loose connections, or deteriorated conductors. Deviations from expected resistance values can indicate problems that may lead to overheating or failure. The test is performed on all windings—primary, secondary, and tertiary (if applicable)—both during commissioning and routine maintenance. Accurate winding resistance values are critical for load sharing and efficient transformer operation.
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