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8. Comprehend the principle of auto-transformer.

8.4. Convert a Two-winding transformer to auto-transformer.

Conversion of 2-Winding Transformer into Auto-transformer

Any two-winding transformer can be converted into an auto-transformer either step-down or step-up. Figure below as shows such a transformer with its polarity markings. Suppose it is a 20-kVA,

You can convert a two winding transformer into a Auto transformer by connecting its winding in series .But while connecting the windings keep the polarity into account because it will change its capacity.suppose you have a 240/120V two winding transformer by connecting these two windings with additive polarity the voltage at output terminal will be 240+120=360V,then transformer will be step up transformer .Similiarly connecting these two windings in subtractive polarity output votage will be 240-120.


Two winding transformer to auto-transformer




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