High temperature superconducting current limiter

摘要

A superconducting current limiter comprising a bar or tube of high temperature superconducting material of the composite type made up of glass and a high temperature superconducting oxide, the volume fraction of the glass lying in the range 10% to 40%, the bar or tube being selected to comply with the following inequalities: rho >10-4 OMEGA xm jc>10+5 A/m2 rho x2<1011 W/m3 in which inequalities: rho designates the resistivity of the material in the normal, i.e. the non-superconducting, state; jc designates the critical current density; rho x2 designates the power density dissipated in the bar or tube during the transition stage; it being specified that the critical current density is defined as the density which produces an electric field of 10-4 V/m along the tube or bar and that it is accepted that limitation takes place for a current density equal to five times the critical current density.