Cables comprising a flexible core and formed of wound superconducting tape wrapped helically around the flexible core, as well as methods of producing such cables are disclosed. The superconducting tape is wrapped around a conductive layer comprising conductive material, providing mechanical cushioning and electrical stabilization for the superconducting material. When producing such cables, tension control techniques support the protection of the superconducting tape and hence degradation of the superconducting material is largely or entirely avoided.

A processing apparatus 200 for a multicore cable 1 processes the multicore cable 1 including a sheath 2 and cores 3 and 4 inserted in the sheath 2, and includes: a slitter 21 that makes a slit along a circumferential direction; a puller 22 that moves at least one of a distal portion of the sheath 2 and a proximal portion of the sheath 2 in a longitudinal direction of the multicore cable 1 to thereby expose the core wires 3 and 4, the distal portion being closer to a distal end of the multicore cable 1 than the slit, the proximal portion being closer to a proximal end of the multicore cable 1 than the slit; a detector 31 that detects a position of a specific core 3 of the cores 3 and 4 in a circumferential direction of the multicore cable 1; and a rotator 32a that rotates the multicore cable 1 based on the detected position of the specific core 3 in the circumferential direction to thereby move the specific core 3 to a predetermined position in the circumferential direction.

The invention relates to a method for manufacturing a medium- or high-voltage electric cable, of the type comprising: a core formed of an elongate electrically conductive element and of an insulating system comprising at least one layer comprising at least one cross-linked polyethylene, said at least one layer being arranged coaxially around the elongate electrically conductive element, and a tape enveloping the core the tape being formed of a semiconductor polymer material., characterised in that the method comprises at least one step of extracting at least one chemical species from the tape, said chemical species being a chemical species able to reach the insulating system by migration from the tape and to decrease the dielectric performance of the insulating system.