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An autotransformer is a single-turn transformer. The primary and secondary sides share a winding system, and its voltage transformation ratio is fixed. Compared with the general transformer of the same capacity, it has the advantages of simple structure, material saving, small size, etc., especially in the occasion of the voltage transformation ratio close to 1. Therefore, it is widely used in high-power transmission transformers with similar voltages, and is widely used in step-down starting boxes of asynchronous motors above 10kw.
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