Applied Superconductivity Research - University of Cambridge B.A.Glowacki Resistive barriers - electric decoupling For ac self field application induced by transport current the use of the electric barriers may appeared to be detrimental, especially when the engineering critical current value is substantially reduced. Required conductors with small coupling current decay time constant short twisting pitch length and high effective interfilament transverse resistivity : = l t 2 / e

Applied Superconductivity Research - University of Cambridge B.A.Glowacki Alloyed matrix better but p filament shape more important twisted The loss contribution from the eddy current loss to the total loss is quite small at 50Hz Filaments are more of an elliptical shape therefore there are higher losses. 85 filaments 37 filaments

Applied Superconductivity Research - University of Cambridge B.A.Glowacki 3 phase Superconducting Cable LN 2 Superconductor Electric Insulation Thermal super- insulation SIEMENS American Superconductor Cable