The aim of this final paper was to present the current conditions in an asymmetrically loaded two-winding transformer for typical examples of single-phase or two-phase asymmetrical loading. Three-phase power systems can be divided into symmetrical and asymmetrical systems. In the case of non-symmetrical systems, the problem of asymmetry is usually solved using the method of symmetrical components. On the examples of a two-phase asymmetrically loaded transformer on the side of a delta-connected winding, a two-phase asymmetrically loaded transformer on the side of a star-connected winding and a single-phase asymmetrically loaded transformer on the side of a star-connected winding, the transformation from an asymmetrical to a symmetrical system is shown in detail using the method of symmetrical components. The previously presented theory was analyzed and confirmed in laboratory conditions.