接触电阻和扭距序列作用下CICC耦合损耗模型

Coupling Loss Model of CICC with Contact Resistance and Cabling Sequence

国际热核试验反应堆ITER和国内今后要建造的聚变工程实验堆CFETR上的CICC导体,将运行在大电流快速励磁的瞬变复杂磁场中,这使得中心螺线CS磁体上的导体会遭受10T以上的磁场冲击,目前已采用铌三锡(Nb3Sn)材料,但应变对Nb3Sn导体临界性能退化作用的研究还在探索中,同时更缺乏导体绞缆级扭距序列和股线接触特性对耦合损耗影响的实验分析研究.为此,在周期载荷模拟应变情况下,开展了不同扭距序列和导体接触电阻对耦合损耗作用的探索.研究分析表明,相对于经典耦合损耗和频谱损耗计算模型,由导体扭距序列比和接触电阻作用组合分析模型,计算获得的耦合损耗误差较小,与测试值最接近.结果显示采用扭距序列比和接触电阻组合的计算方法能取得较满意效果.

International thermal-nuclear experimental reactor and China fusion engineering testing reactor, to be built in the future, will run in the transient complex magnetic field with the large current quick exciting, which makes the conductor on the center spiral magnet suffer the impact of the magnetic field above 10 T. So, the N-b3 Sn material has been used. However, for the Nb3 Snbased conductor, research of the critical performance degradation due to strain is still inadequate. Especially, it is lack of the experi- mental analysis study of the influence of the twist pitch and contact charactersfics on coupling loss. Therefore, by simulating strain with the cycle load,the effect exploration of coupling loss is carried out with the different cabling sequence ratio and a contact resis- tance. Compared with calculation models of classical coupling loss and the spectrum loss,the coupling loss error with the combination model of conductor cabling sequence ratio and contact resistance is small, the combination model calculation is the closest to the measured value. The result shows that the calculation technology of the cabling sequence ratio and contact resistance can obtain sat- isfactory result.