WOUND IRON CORE FOR STATIC ELECTROMAGNETIC DEVICE, THREE-PHASE TRANSFORMER, AND THREE-PHASE REACTOR

The objective of the present invention is to provide a wound iron core for a static electromagnetic device that reduces the electrode spacing of each iron core, and allows the voltage drop or loss occurring in the electrode wiring to be reduced. A three-phase wound iron core for a static electromagnetic device provided with two adjacent inner iron cores (2) on which are wound a magnetic material in the form of a thin strip, and an outer iron core (1) on which is wound a magnetic material in the form of a thin strip so as to cover the outer circumference of the two inner iron cores (2), wherein the width of the thin magnetic material strip on the outer iron core (1) is made smaller relative to the width of the thin magnetic material strip on the inner iron cores (2), the cross-section area of the outer iron core (1) is smaller than the cross-section area of the inner iron core (2), and the difference in cross-section area between the inner iron core (2) and the outer iron core (1) constituting one magnetic leg is no more than 40% of the sum of the cross-section areas of both iron cores (1, 2).