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Turns Ratio & Winding Resistance Testing

Transformer problems or faults occur due to poor design, assembly, handling, environmental damage, overloading or subpar maintenance.

Measuring the resistance of the transformer windings ensures that the connections are correct and the resistance measurements indicate that there are no severe mismatches or opens.

The transformer turns ratio test, or TTR test, confirms that the transformer has the correct ratio of primary turns to secondary turns. Using this test correctly can help to identify tap changer performance, shorted turns, open windings, incorrect winding connections and other faults inside transformers.