Special Form Of Auto Transformers

We are engaged in manufacturer and supplier of Special Form Of Auto Transformers in Kalol, Gujarat, India. These are unique 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 winding (see illustration). The current in the low-voltage circuit flows through the typical 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 auto-transformer 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 Auto Transformer provides no isolation of the primary and secondary circuits.