JPS6465813A - Transformer - Google Patents

Abstract

PURPOSE:To substantially make zero the thrust in axial direction generated on a winding by a method wherein high-tension windings are composed of the main wire stacked in axial direction and a tap winding, and low-tension windings, which are opposing to axial direction for every group of said high- tension windings, are provided and parallel-connected. CONSTITUTION:Low-tension windings 1, consisting of an upper low-tension winding 11 and a lower low-tension winding 12, is provided on the outer circumference of an iron core 9, high-tension windings 2, consisting of an upper main winding 20 and a lower tap winding 3 stacked on the main winding 20, is provided outside the low-tension winding 1, and the windings 11 and 12 constituting the low-tension winding 1 are parallel-connected. In the above-mentioned state, when the non-current application part of a winding 3 is changed by switching the tap of the tap winding 3, in other words, when the center of the ampere-turn distribution of the high-tension winding 2 is changed, the center position of the ampere-turn distribution of the low-tension winding 1 is also changed in the same manner as above. Accordingly, the center position of each ampere-turn does not change so much even when the tap is switched and a transformer which is resistant to outside short-circuit can be obtained.