Title :
AC losses in HTSC conductor elements
Author :
Boggs, S.A. ; Collings, E.W. ; Parish, M.V.
Author_Institution :
Underground Systems Inc., Armonk, NY, USA
Abstract :
AC self-field losses and DC dynamic resistivity in HTSC conductor elements have been measured. The data are discussed with reference to the relevant theory. For two very different sample types, the J/sub c/ calculated on the basis of the AC self-field loss is about an order of magnitude lower than the J/sub c/ based on the 1- mu V/cm DC voltage drop criterion often used for HTSC materials. This is attributed to the onset of resistive behavior at currents much lower than the reported J/sub c/ based on the 1- mu V/cm criterion. The J/sub c/ determined from measurements of the dynamic resistivity of a melt-textured YBCO fiber is within 15% of that determined by magnetic measurements.<>
Keywords :
composite superconductors; critical current density (superconductivity); high-temperature superconductors; losses; superconducting cables; AC losses; DC dynamic resistivity; DC voltage drop criterion; YBaCuO; cables; critical current density; high-T/sub c/ superconductor elements; melt-textured fibre; multifilamentary superconductors; onset of resistive behavior; self-field losses; Conductivity; Conductors; Costs; Dielectrics; High temperature superconductors; Magnetic fields; Magnetic materials; Power cables; Superconducting cables; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
