超電導技術は，既存の技術では実現困難な飛躍的性能 向上をもたらす可能性があること，また省エネルギー， 環境負荷低減の観点からも，様々な技術分野において注 目されている。その中で，従来よりも高い温度で取り扱 いが可能となることで大きな期待を集めてきた高温超電 導技術は，発見から20年が経過し，いよいよ送電ケーブ ル，変圧器，モーター等への応用展開が始まっている。%Twenty years have passed since the discovery of the phenomenon of high-temperature superconductivity. Studies have now shifted away from basic research and are focusing on the field of application. At the same time, remarkable progress has been in the field of high-temperature superconducting (HTS) wires made of rare earth (RE) coated materials featuring high values of critical current in the environment where the temperature is higher and the magnetic field is stronger than ever. In this context, Railway Technical Research Institute (RTRI) has started a study on the application of RE coated wires to HTS magnets for the MAGLEV system. In this study, it is important to examine thoroughly the properties of the wire usable and reflect them in the design of superconducting magnets. Therefore, the authors have developed an HTS wire testing-device to evaluate the conductivity characteristics of HTS wires in detail under arbitrary temperature and magnetic field conditions.
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