Development And Tests Of Extruded Ethylenepropylene-Rubber-Insulated Superconducting Cable

The simultaneous application of the design voltage (20 kVrms) and current (2 kArms) to ethylenepropylene-rubber (EPR)-insulated superconducting cable, cooled by liquid helium, was successfully carried out. The superconductor was a niobium layer clad on a copper pipe. The EPR insulation was extruded simultaneously with semiconducting electrostatic shielding layers. A specific advantage of this cable design is the complete exclusion of the cryogenic helium from the electrical Insulation structure.