Three-phase transformer

A three-phase transformer comprising a magnetic circuit and three coil blocks, wherein the magnetic circuit comprises:

• two spaced-apart parallel plate-like elements in the form of toroids;
• and
• three spaced-apart, parallel column-like elementary circuits in the form of toroids, each of the column-like elementary circuits carrying the corresponding one of said three coil blocks and serving for the corresponding one of the three phases, wherein the column-like elementary circuits are substantially perpendicular to the plate-like elements and are enclosed therebetween such as to form a spatial symmetrical structure about a central axis of the transformer;
• wherein
• at least the column-like toroids are in the form of multi-layer structures, each structure being composed of an array of N amorphous strips packages wound about the central axis of the toroid and being aligned along said central axis, each package being a stack of n layers formed by n amorphous strips aligned along an axis perpendicular to said central axis and shifted with respect to each other a predetermined distance in a direction along said central axis such that each of air gaps naturally existing between each two adjacent strips in the layer is overlapped by (n−1) strips aligned along the axis perpendicular to the central axis of the toroid, and
• each of the column-like elementary circuits is formed with a radial slot filled with an insulating material.