THREE-WINDING SCOTT CONNECTION TRANSFORMER

PURPOSE:To be small-sized and to get good balance of ampere-turn by a method wherein a tap winding is an independent separate winding, the tap winding is made multiple winding, especially a primary U-phase tap winding and a primary W-phase tap winding of a principal transformer are made common parallel windings. CONSTITUTION:The other end of a primary U-phase winding 1 to be connected to a primary U-terminal of a principal transformer is connected to one end of a primary U-tap winding 2, while the other end of the primary U-tap winding 2 is connected to the primary side neutral point M of the principal transformer. Similarly, the other end of a primary W-phase winding 3 to be connected to a primary W-terminal of the principal transformer is connected to one end of a primary W-tap winding 4, while the other end of a winding 4 is connected to the primary side neutral point M. A principal secondary winding 5 is wound correspondingly to the primary U-phase winding 1, while a principal 3-phase winding 6 is wound correspondingly to a winding 3. On the other hand, the other end of a primary V-phase winding 7 to be connected to a primary V-terminal of a T-seat transformer is connected to one end of a primary V-tap winding 8, while the other end of the winding 8 is connected to the primary neutral point M. A T-seat secondary winding 9 and a T-seat third winding 10 are wound correspondingly to the winding 7.