Treeing Characteristic of EPR for Solid Insulated Superconducting Cable

Abstract

Superconducting power cables are one of the promising ways for handling large volumes of electric power efficiently in the future. The authors have proved that ethylene-propylene rubber (EPR) is suitable for use as the solid electrical insulating material of superconducting cable due to its excellent mechanical and electrical properties at cryogenic temperature. It is therefore imperative to study EPR resistance to treeing in view of long-term reliability as a cable insulator. The objectives of this study were to examine EPR resistance to treeing both at liquid nitrogen and room temperatures and the effect of fillers on resistance to treeing. The results show that EPR has sufficient resistance to AC treeing at liquid nitrogen temperature and the fillers improve resistance to AC treeing slightly.