Transformer core for a cut-and-stack type transformer and transformer including same

Abstract

A transformer core includes two stacks, each of first thickness with ≥1 flat parts, the cutting directions rectilinear and parallel or perpendicular to one another, the stacks facing across a gap, the flat parts made of an austenitic FeNi alloy 30-80% Ni and 10% alloying elements, with a sharp {100} <001> cubic texture, the cutting directions of the flat parts parallel to the rolling or transverse direction, the flat parts having magnetic losses, for a maximum induction of 1 T, <20 W/kg at 400 Hz, producing apparent magnetostriction for maximum induction values and field directions as follows: 1.2 T<5 ppm, large side of the sample parallel to rolling direction; 1.2 T<5 ppm, large side of the sample parallel to transverse direction in the rolling plane; and 1.2 T<10 ppm, length direction parallel to intermediate direction 45° to rolling and transverse directions.