Abstract
A study on the development of a superconducting cable has been conducted actively due to its ‘0’ resistance characteristics. A superconducting cable consists of three parts: termination, core, and joint box. A joint box could be classified into normal joint box (NJB) and stop joint box (SJB) according to its structure. In this paper, a study on the development of the design technology of SJB where a bulkhead is installed to maintain a constant pressure and temperature of a cryogenic system is conducted. In an SJB system, a bulkhead is installed at a superconducting core system and impregnated with epoxy resin, and then wound with polypropylene laminated paper (PPLP) in order to insulate the superconducting core system. The creepage discharge characteristics along the surface of a solid insulation material in liquid nitrogen (LN₂) are investigated through dielectric experiments and the criterion to perform electrical insulation design of an SJB system for a distribution superconducting cable is proposed.
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