10 kV三相同轴高温超导电缆暂态电热特性分析  

Transient electrothermal characteristics analysis of a 10 kV tri-axial HTS cable

作　　者：管广域 丁开忠[2] 诸嘉慧[3] 曹京荥 刘佳鑫 杜庆庆[2] 董育军[2] 陈杰 杜双松 冯昌乐 Guan Guangyu;Ding Kaizhong;Zhu Jiahui;Cao Jingying;Liu Jiaxin;Du Qingqing;Dong Yujun;Chen Jie;Du Shuangsong;Feng Changle(Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;China Electric Power Research Institute,Beijing 100192,China;State Grid Jiangsu Electric Power Co.,Ltd,Nanjing 210000,China;State Grid Liaoning Electric Power Co.,Ltd,Shenyang 110006,China)

机构地区：[1]安徽大学物质科学与信息技术研究院,合肥230601 [2]中国科学院合肥物质科学研究院,合肥230031 [3]中国电力科学研究院,北京100192 [4]国网江苏省电力有限公司,南京210000 [5]国网辽宁省电力有限公司,沈阳110006

出　　处：《低温与超导》2021年第7期27-32,共6页Cryogenics and Superconductivity

基　　金：国家电网科技攻关项目(DG71-20-006)资助。

摘　　要：三相同轴高温超导电缆会受到电力系统中短路故障电流冲击,产生大量热,并可能被损坏。通过采用超导电缆各层的电流分布解析算法和温度分布数值计算法,构建了电缆仿真分析模型,包含电路模型、热模型和电热耦合模型。对10 kV/1.5 kA三相同轴高温超导电缆在20 kA,持续0.21 s故障电流冲击时的电流、电阻和温度分布进行计算。结果表明,在故障时间内,伴随着温度的上升,电缆各相等效电阻逐渐上升和电流逐渐下降。电缆三相同时短路时超导层的温度上升最大,温度最高可达131.1 K。电缆单相或两相短路时通过中性线的电流最大。分析结果为电缆的参数优化和保护运行系统的装置设计提供了参考依据。Tri-axial high temperature superconducting(HTS) cable usually subjects to the impact of fault currents in the power system.During the fault, a large amount of Joule heat is generated, which may be damage cable. In this paper, a simulation analysis model of tri-axial HTS cable was built by using the current distribution analysis algorithm and the numerical calculation method of the temperature distribution of each layer of the HTS cable, which included the circuit model, the thermal model and the electro-thermal coupling model.The current and temperature distributions of the 10 kV/1.5 kA tri-axial HTS cable under the short-circuit fault of 20 kA lasting 0.21 s were calculated. The result shows that the each phase equivalent resistance gradually rises and the each phase current gradually decreases with the gradually rise of temperature during the short-circuit fault. The temperature is the largest under three-phase short-circuit, and the maximum temperature can reach 131.1 K. The current of neutral wire is the largest under the single-phase and two-phase short-circuit fault. The analysis result can provide a reference for cable parameters optimization and the device design of cable protection system.

关 键 词：短路故障 三相同轴 电流分布 电阻分布 温度分布 

分 类 号：TM26[一般工业技术—材料科学与工程]