SINGLE-PHASE THREE-WINDING TRANSFORMER

PURPOSE:To contrive miniaturization and lightweightedness of the titled transformer by a method wherein a parallel connection is performed between each medium voltage wire, the high tension wiring on the line side and the high tension winding on the neutral point side are connected in series, and a tap winding is series-connected to the high tension winding on the neutral point side. CONSTITUTION:A tap winding 5, a medium voltage winding 3A and a line-side high tension winding 2A are wound around the main leg 1A of a single-phased and four-legged core from core side successively, and a low voltage winding 4, a medium voltage winding 3B and a neutral point side high tension winding 2B are successively wound around the main leg 1B. Then, the winding 2A of the main leg 1A, the winding 2B of the main leg 1B and the tap winding 5 of the leg 1A are connected in series, the winding 3A of the main leg 1A and the winding 3B of the main leg 1B are connected in parallel, and a single-phase and three-winding transformer is constituted. As a result, the shielding of the core is unnecessitated, and the insulated area is reduced, thereby enabling to remarkably increase the space factor of the winding located inside the core window.