超导电力装置电流引线迫流冷却传热分析  

Heat Transfer Analysis of Force-Cooled Current Leads in Superconducting Electric Equipment

作　　者：刘瑞芳[1] 马菁[1,2] 

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]北京京仪敬业电工科技有限公司,北京100069

出　　处：《电工技术学报》2014年第1期196-201,共6页Transactions of China Electrotechnical Society

摘　　要：超导电力装置中连接低温磁体与室温电源的电流引线是整个系统漏热的主要来源。为减少系统漏热,有必要对电流引线进行热损耗分析。本文应用有限元法对超导储能系统中的35kV/2kA电流引线进行漏热分析和优化设计,并研究了对引线采用氮气迫流冷却时的传热问题。在利用传统方法得到电流引线初始取值范围的基础上,采用有限元法对自冷条件下的电流引线进行电热耦合分析,得到最小漏热目标下电流引线的长横比。接着分析了氮气迫流冷却条件下电流引线与氮气的共轭传热问题,得到铜引线的温度分布及氮气流速、换热系数与出口压强之间的关系。分析结果为确定真空泵的运行参数提供了依据。In superconducting electric equipment, the current lead connects the room-temperature power supply and the tow-temperature superconducting magnet. It is the main source of thermal leakage in the system. In order to decrease the thermal leakage, it is necessary to analyze the thermal loss of current lead. The heat leakage analysis and optimization design of 35kV/2kA current lead are presented in this paper. Based on initial range of current lead acquired from traditional methods, the electric-thermal coupling analysis will be executed based on finite element method. The length and cross sectional area ratio of the current lead at minimum heat leakage condition will be obtained. Under the nitrogen forced cooling flow condition, the heat transfer problem of the current lead and the nitrogen is analyzed. The temperature distribution of copper wire and nitrogen flow, heat transfer coefficient and pressure will be calculated. The results are helpful to determine the operating parameters of the vacuum pump.

关 键 词：电流引线 迫流冷却 优化设计 有限元法 传热 超导装置 

分 类 号：TM315[电气工程—电机]