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Autotransformers

Autotransformer is an electrical transformer in which there is one winding, a portion of which is common to both the primary and the secondary circuits. An autotransformer uses common windings and offer no interference or disturbance isolation.
A special form of transformer having one winding, a portion of which is common to both the primary and the secondary circuits. The current in the high-voltage circuit flows through the series and common windings.
The current in the low-voltage circuit flows through the common winding and adds vectorially to the current in the high-voltage circuit to give the common winding current. Thus, an electrical connection exists between high-voltage and low-voltage windings. Because of this sharing of parts of the winding, an autotransformer having the same kilovolt-ampere (kVA) output rating is generally smaller in weight and dimensions than a two-winding transformer. One possible disadvantage of auto-transformers is that the windings are not insulated from each other and that the autotransformer provides no isolation of the primary and secondary circuits.
Auto-transformers are used in small sizes for intermittent-duty starting of motors called as motor starter. For this use the motor is connected for a short time to the common winding voltage.
 Please choose Single phase or Three phase autotransformer

Single phase
Single phase
Three phase
Three phase
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