A mechanism causing an additional AC loss in a large CICC coil
A mechanism causing an additional AC loss in a large CICC coil
复制标题
在大型 CICC 线圈中引起额外交流损耗的机制
DOI：
10.1109/77.920211
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发表时间：
2001
影响因子：
1.8
通讯作者：
T. Satow
中科院分区：
文献类型：
--
作者：
T. Hamajima;M. Yoshida;H. Shimamura;N. Harada;M. Tsuda;S. Hanai;T. Satow
一个大型超导线圈缠绕电缆导管（CIC）导体引起的额外的交流损耗，不能估计从短导体样品测试结果。经证实，额外的交流损耗是由CIC导体中的长电流回路产生的。通过霍尔探针观察到具有不同长时间常数的环的磁场衰减。我们提出了一种形成长循环的机制。CIC导体由多个分级的子电缆组成。如果子电缆表面上的一股线与相邻子电缆表面上的另一股线接触，则两股线必须在所有分级电缆节距的LCM（最小公倍数）距离处再次彼此相遇，从而导致形成一对长环。我们按照子索在所有子阶段绕惯性中心旋转的方法跟踪CIC中的每一股。计算了长时间常数，其结果可以解释大型超导磁储能线圈的测量数据。所提出的机制是有效的估计线圈中的附加交流损耗。
A large superconducting coil wound with cable-in-conduit (CIC) conductor caused an additional AC loss which cannot be estimated from short conductor sample test results. It was confirmed that the additional AC loss was generated by long current loops in the CIC conductor. Magnetic field decays of the loops with various long time constants were observed through Hall probes. We propose a mechanism forming the long loops. The CIC conductor is composed of several staged sub-cables. If one strand on the surface of a sub-cable contacts with the other strand on the surface of the adjacent sub-cable, the two strands must encounter each other again at LCM (least common multiplier) distance of all staged cable pitches and thereby result in forming a pair of a long loop. We traced each strand in the CIC according to a method that the sub-cables at all sub-stages rotate around a center of inertia. The long time constants were calculated and their results can explain the data measured in a large SMES coil. The proposed mechanism is effective for estimating the additional AC loss in the coil.