基于第二代高温超导带材的高载流超导导体研究进展

Recent status and development of high current conductor made from 2g HTS tapes

由于其高临界电流密度以及优越的机械性能和电磁特性,第二代高温超导带材(也叫涂层导体)在高温低场的电力传输和低温高场下的磁体应用具有广阔的应用前景。在电力传输的低场应用中,高温超导导体在低电压大容量场合需要几千安培甚至上万安培的传输电流。在大型高场磁体应用方面,为了避免由于过高电感在磁体失超和快速关断过程中的感应高压问题,大载流容量、高电流密度高温超导导体在运行于4.2K及以下温度的大型高场超导磁体方面具有很好的应用前景。近年来,基于第二代高温超导带材,国际上相继提出了几种高载流容量的高温超导导体,本文介绍几种高温超导导体的结构及研发现状和进展,并对其结构、性能和工艺进行简单的比较和评述。

The second-generation high-temperature superconductors（ HTS） tapes,so called REBCO coated conductor（ CC）,are attractive for power transmission at liquid nitrogen temperature and high-field application at low temperatures because of their high critical current density and the excellent mechanical performance as well as electro-magnetic characteristics. For the former application,high-current cables or conductors made from HTS tapes with capacity of tens k A up to more than 100 k A are desirable. In the latter application,high-current HTS conductors are essential for larger high-field magnets operated at 4. 2 K or lower to avoid high inductances which would cause high-voltage breakdown in case of quench or fast shutdown. In recent years,several prototypes of HTS conductors,consisting of 2 G HTS tapes,were successively proposed internationally. This paper presents an overview of such configurations as well as their progress and status,and briefly reviews their geometrical structure and performance as well as processing technology.