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目前,由于制作工艺的限制,可生产的YBCO涂层导体(2G)的最大长度低于1km,而其在工程应用中需要的长度远远大于可生产长度,因此,针对超导接头技术开展相关研究具有重要的意义。提出了一种测试YBCO涂层导体焊接接头电流分布的试验方法。利用这种方法,分别对3cm,5cm,6cm,8cm,10cm 5种不同长度接头电流和电阻分布进行了测试,并用一个理论模型与实验结果进行了比较。结果显示:接头上下两层带材之间的电流流动大部分是在端点附近完成的;另外,接头电阻是由上下两层带材之间的电流流动引起的,并且主要是由端点处的电流流动决定的。
At present, the maximum length of YBCO coated conductor (2G) that can be produced is less than 1km due to the limitation of the manufacturing process, and the length required for engineering application is far greater than the producible length. Therefore, the technology for superconducting joint Research is of great significance. A test method for testing the current distribution of YBCO coated conductors is presented. Using this method, the current and resistance distributions of 5 different lengths of 3cm, 5cm, 6cm, 8cm and 10cm were tested and compared with the experimental results by a theoretical model. The results show that the current flow between the two upper and lower strips of the joint is mostly done near the end point. In addition, the resistance of the joint is caused by the current flowing between the two upper and lower strips and is mainly caused by the current Flow-driven.