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A variable autotransformer is a single-coil transformer in which two portions of the same coil are used as the primary and the secondary. Variable autotransformers are used for the same purposes as regular transformers, but handle lower voltages.n the autotransformer, a primary voltage is connected from the bottom to a specific winding known as a âtap,â and a secondary voltage is connected from the bottom to a separate winding.
An autotransformer is a transformer having part of its winding included in both the input and output circuit. A simple autotransformer connection is shown in Fig. 1. Note that because there is a common portion of the winding (Section 1-2), there is no isolation between the input and output circuits.Also note that there is only one winding. As shown in the diagram, the line current is 10A for a 2000VA output (10A x 200V).. Note that because there is a common portion of the winding (Section 1-2), there is no isolation between the input and output circuits. Also note that there is only one winding. As shown in the diagram, the line current is 10A for a 2000VA output (10A x 200V).