１００ｍ超電導ケーブル実用性検証試験の概要

Abstract

Since the discovery of High-Tc superconducting (HTSC) materials, elementary technologies of an HTSC cable system have been developed such as the manufacturing technology of a conductor wound with HTSC wires, cold dielectric properties, and thermally insulated pipes. HTSC cable models have also been constructed to evaluate these technologies. As a next step, new test project of a 100m, 66kV/1, 000A/100MVA class, three-core HTSC cable system, integrating these elementary technologies, are planned to verify the practicability of an HTSC cable system as an actual power system equipment. It is a joint project of Tokyo Electric Power Company and Sumitomo Electric Industries, Ltd., and is being conducted in collaboration with the Central Research Institute of Electric Power Industry. The purposes of this project are to prove newly developed technologies satisfying the requirement as actual deployments, to prove manufacturing abilities and installation technologies, and to conduct long-term current-voltage loading tests. The cable consists of three-core conductors placed in thermally insulated pipes having a vacuum insulation layer between them. Each conductor consists of a copper former, superconducting layers, PPLP/LN2 composite insulating layer, and superconducting shielding layers. The cable is placed at a CRIEPI test yard and is bent into U-shape at its center, partially installed into a duct 150mm in inner diameter. The following tests are scheduled, using this cable system, such as an initial cooling test, continuous rated current-voltage loading tests, load fluctuation tests, cooling cycle test between room temperature and LN2 temperature, and overloading and overvoltage withstand tests. Through these tests, problems are expected to be extracted that may be difficult to foresee in individual part tests for development of an actual level HTSC power cable system.