The equivalent circuit of a two-winding autotransformer with mapping of magnetic fluxes

The fundamentals of a new theory of a two-winding autotransformer have been suggested, and a universal 4T-shaped equivalent circuit has been obtained. The circuit has a universal behavior, since it provides mapping of all the magnetic fluxes in the window and in the yoke of the autotransformer, as well as in the region between the yoke and autotransformer, tank in the case of saturation under any load. It is shown that super- and antifluxes with respect to the idle flux occur in the magnetic circuit of a short-circuited autotransformer. It has been shown that these fluxes can be much higher than the corresponding fluxes in shortcircuited transformers. It has been concluded that the autotransformer theory should be refined. It is shown that the solution of the problem requires a fundamental understanding of the operation of transformers and autotransformers. © 2017, Allerton Press, Inc.