BLANK FOR MANUFACTURING A SUPERCONDUCTING COMPOSITE WIRE BASED ON NB3SN

The invention relates to the field of electrical engineering and the creation of long composite wires based on superconducting compounds for use in the manufacture of electrical equipment. A blank for manufacturing a superconducting composite wire based on Nb3Sn consists of a copper jacket, inside which a copper-containing matrix is disposed, at the centre of which lies a rod containing tin, around which a plurality of niobium-containing rods are arranged in a copper-containing casing, wherein the copper-containing matrix is surrounded by a diffusion barrier, and a niobium-containing rod is comprised of a composite containing a matrix which is made of niobium or an alloy thereof and which is reinforced with filaments made of a Nb-Ti alloy, which are arranged at a distance of not less than one average size of a Nb-Ti alloy filament to the boundary of the copper-containing casing, wherein the distance between said filaments is not less than one average size of a Nb-Ti alloy filament. The technical result is high current carrying capability in a superconducting composite wire based on Nb3Sn in magnetic fields with an induction greater than 12 T.