超导除铁器二元电流引线设计及实验研究

Design and Experiment Research of the Binary Current Lead for SEIR System

二元电流引线是超导电磁除铁器的关键部件之一,主要由上端的铜电流引线、中部的热交换器以及下端的高温超导电流引线3部分组成。设计制作了中心场磁感应强度为3 T的200 A二元电流引线;通过实验对电流引线的漏热、换热器内部的热阻以及高温超导线与铜基体的焊接电阻进行了测量,并研究了制冷机故障或者停电状态下电流引线的瞬态温度变化。理论分析和实验结果都表明,所设计的电流引线可以满足超导除铁器运行的性能要求。

Binary current lead is one of the key parts of superconducting electromagnet iron remover （SEIR） system. It mainly consists of a copper current lead at the upper end, an intermediate heat exchanger and a high temperature superconductor （HTS） current lead at the lower end. A 200A binary current lead with a central magnetic induction strength of 3T is designed. The heat leak of the current lead, the internal heat resistance of the exchanger and the welding resistance between HTS line and the copper matrix are measured and the transient temperature change of the current lead at a eryocooler breakdown or power failure is studied. Both the theoretical and experiment results show that the designed current lead can satisfy the performance requirement for the operation of superconducting electromagnet iron remover （SEIR） system.