SUITABLE MAGNETIC NUCLEUS FOR USE IN AN INTENSITY TRANSFORMER, PROCEDURE FOR MANUFACTURING A MAGNETIC NUCLEUS AND INTENSITY TRANSFORMER WITH A MAGNETIC NUCLEUS.

摘要

Magnetic core for an intensity transformer - which is constituted by a wound strip (B) of a ferromagnetic alloy in which at least 50% of the volume of the alloy is occupied by fine crystalline particles with an average particle size of 100 nm or less (nanocrystalline alloy), - which has a permeability that is greater than 12000 and less than 300000, - that has a saturation magnetostriction whose magnitude is less than 1 ppm, - that is substantially free of mechanical stress, - that has a Anisotropy axis (A) along which the magnetization of the magnetic core (M) is oriented with special ease and which is perpendicular to a plane in which the middle line of the strip (B) runs, the alloy presenting a composition consisting substantially of the formula FeaCobCucSidBeMf where M is at least one of the elements V, Nb, Ta, Ti, Mo, W, Zr and Hf, since, b, c, d, e, f are indicated in% in atoms , and where a, b, c, d, e and f satisfy the following conditions: 0.5 c 2; 6, 5 d 18; 5 and 14; 1 f 6, with d + e 18 and 0 b 15, where a + b + c + d + e + f = 100, and characterized in that the strip (B) has a lower depth of roughness Ra (ef.) to 7%.