YBCO超导带材堆叠导线中内封接头的电流分布仿真模型研究  

Study on Current Distribution Simulation Model of Inner Encapsulated Joints for the YBCO Soldered-stacked(SS) Wire

作　　者：钱刚 刘斌 张建文[1] 王龙彪 李柱永 金之俭[1] QIAN Gang;LIU Bin;ZHANG Jianwen;WANG Longbiao;LI Zhuyong;JIN Zhijian(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海市闵行区200240

出　　处：《中国电机工程学报》2022年第14期5360-5373,共14页Proceedings of the CSEE

基　　金：国家电网有限公司科技项目(520940200016);国家自然科学基金项目(52077134)。

摘　　要：由于目前超导带材制备工艺的限制,单根超导带材长度通常为数十米到数百米。为满足超导电机等实际工程应用中对超导线材长度以及载流能力的需求,可利用接头工艺将多根超导带材搭接,再经过堆叠、封装,形成含有“内封接头”的高温超导堆叠导线。但是,当高温超导堆叠导线通流时,内封接头处的电流分布会导致堆叠导线的整体阻值呈现复杂性。因此,为了探究流经内封接头的电流分布特性,针对含有内封接头的高温超导堆叠导线,该文搭建一种非线性电路仿真模型。首先,从单根超导带材的搭接接头出发,分析3种典型结构的接头模型,并采用拱形接头进行等效后建立了等效电路模型;其次,比较在不同电流下,堆叠导线中铜带层对电流分布的影响;然后,基于二者建立了含有2根超导带的堆叠导线的简化电路模型,并基于该模型解释了含内封接头堆叠导线的“多线性阻值”现象;最后,利用该模型,比较了2种解决超导带材含坏点问题的方案。结果为分析含有内封接头的堆叠导线的电流分布提供了参考依据,并为后续堆叠导线的长线化工艺提供了指导。Due to the limitation of the manufacturing process of high temperature superconducting tapes(HTS tapes),the length of a single HTS tape is usually tens of meters to hundreds of meters.In order to meet the needs of the length and current carrying capacity of superconducting wires in practical engineering applications such as HTS motors,lapped joints can be formed to join several HTS tapes,and these tapes are stacked and packaged to form HTS stacked wires with "inner encapsulated joints".However,the current distribution at the inner encapsulated joints will lead to complex characteristics of the overall resistance of the stacked wires.Therefore,in order to investigate the current distribution in the inner encapsulated joint of HTS stacked wires,a nonlinear circuit simulation model was proposed in this paper.Firstly,this paper analyzed three typical lap joint structures of single HTS tape,and established the equivalent circuit model based on the equivalent structure of an arched joint.Secondly,under different current conditions,this paper investigated the influence of copper layers on current distribution in stacked wires.Thirdly,based on the aforementioned research,a simplified model of stacked wires with two HTS layers was established.Based on this model,the phenomenon of “multi-linear resistance” of stacked wires with inner encapsulated joints was explained in detail.Finally,two improvement methods for stacked wires with defects on HTS layers were compared by using the model proposed in this paper.This study could provide a reference for analyzing current distribution in stacked wires with inner encapsulated joints,and provide guidance for future work of extending the length of stacked wires.

关 键 词：高温超导带材 超导接头 堆叠导线 电流分布 非线性电路 

分 类 号：TM72[电气工程—电力系统及自动化]