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| Heat Transfer Analysis of Force-Cooled Current Leads in Superconducting Electric Equipment |
| Liu Ruifang1, Ma Jing1, 2 |
1. Beijing Jiaotong University Beijing 100044 China;
2. Beijing Jingyi Jingye Electric Technology Co.Ltd. Beijing 100069 China |
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Abstract In superconducting electric equipment, the current lead connects the room-temperature power supply and the low-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.
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Received: 20 September 2012
Published: 16 June 2014
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2014, Vol. 29 
