Ratio testing of a transformer verifies the turns ratio between the primary and secondary windings, ensuring it matches the design specifications. This test is crucial for confirming proper voltage transformation and overall performance. Conducted using a transformer turns ratio (TTR) meter, the test applies a low voltage to one winding and measures the resulting voltage in the other, comparing it to the expected ratio. Accurate ratio values indicate correct winding configuration, while deviations may suggest shorted turns, incorrect connections, or manufacturing defects. Ratio testing is performed during factory acceptance, commissioning, and maintenance to ensure the transformer operates safely and efficiently.
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