A superconducting cable having at least one phase and having: a) a layer of
tapes of superconducting material; b) a tubular element of superconducting
material for supporting said layer of tapes, said tubular element having
at least one portion made of metallic material, and being in electrical
contact with the layer of tapes of superconducting material; c) a cooling
circuit adapted to cool the superconducting material to a working
temperature not higher than its critical temperature, having a fluid at a
predetermined working pressure ranging between a minimum value and a
maximum value; wherein the deformation of said tapes of superconducting
material, consequent to a temperature variation between the room
temperature and the working temperature of the cable is lower than the
critical deformation of the same tapes. A predetermined amount of
conductive material of resistive type in electrical contact with the layer
of superconducting material is present, such that the maximum temperature
reached by the superconducting material in case of short circuit is lower
than the minimum temperature between the critical temperature of the
superconducting material and the boiling temperature of said cooling fluid
at the minimum working pressure of said fluid.
