Electrical degradation of a high-T/sub c/ superconductor by continuous current transport
Electrical degradation of a high-T/sub c/ superconductor by continuous current transport
复制标题
连续电流传输导致高温/亚c/超导体的电退化
DOI：
10.1109/tasc.2003.812066
复制
发表时间：
2003
影响因子：
1.8
通讯作者：
T. Ko
中科院分区：
文献类型：
--
作者：
D. Bae;Sangjin Lee;J. Bae;K. Sim;Kyong;T. Ko
世界上有几家公司正在销售超导产品，如电线、薄膜和块状等。高低温/亚低温/超导（High-T/sub - c/ superconducting， HTS）系统已经开始商业化，对其的需求也在不断增加。高温度/低温/超导体的电退化数据库是高温超导系统商业化的基本要求。本文研究了Bi-2223焊丝的电退化问题。为了模拟实际系统的情况，制备了两种类型的试样。一种是将Bi-2223丝盘绕在直径为400mm的筒子上，称为环形试样；另一种是将Bi-2223丝盘绕在直径为100mm的筒子上，称为双煎饼试样。将双煎饼试样的Bi-2223丝用几种缠绕张力缠绕。采用连续电流输运法对电退化进行了测量。在每个导体上施加不同程度的输运电流。环形试件的水平分别为临界电流（I/sub / c/）的90、95、98和110%，双煎饼试件的水平分别为95和150%。虽然在长Bi-2223丝中发现了I/sub / c/的差异，但在环形试样中没有任何严重的退化。当输运电流低于临界电流时，双煎饼试样也未出现劣化现象。然而，当输运电流水平为I/sub / c/的150%时，它们降解得非常快。
Several companies in the world are marketing superconducting products, such as wires, films, and bulk, and so on. High-T/sub c/ superconducting (HTS) systems have begun to be commercialized with these HTS products, and the demand for them is increasing. A database on the electrical degradation of high-T/sub c/ superconductors is an essential requirement to commercialize HTS systems. The electrical degradation of Bi-2223 wire has been investigated in this paper. To simulate the conditions of real systems, two types of specimens were prepared. One was named Ring Specimen with Bi-2223 wire on a bobbin of 400 mm diameter and the other was named Double-Pancake Specimen with Bi-2223 wire coiled on a bobbin of 100 mm diameter. The Bi-2223 wire of the Double -Pancake Specimen was coiled with several winding tensions. The continuous current transport method was used for the measurement of the electrical degradation. Various levels of transport current were applied to each conductor. The levels are 90, 95, 98, and 110% of the critical current (I/sub c/) in Ring Specimens and 95 and 150% in Double-Pancake Specimens. Although a difference of the I/sub c/ in the long Bi-2223 wire was found, there was not any severe degradation in the Ring Specimens. When the level of transport current was below the critical current, degradation did not appear in the Double-Pancake Specimens either. However, they degraded very quickly when the level of transport current was 150% of I/sub c/.