绕组螺距对CORCs制ccic动态电阻的影响

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2025-03-12 DOI:10.1016/j.physc.2025.1354681

Liguang Hu , Xuhui Xu , Bibo Zhou , Xian Chen , Qi Cheng , Bangzhu Wang , Junhua Cheng

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引用次数: 0

摘要

第二代（2G）高温超导（HTS） REBCO带是目前唯一可能用于25 T以上的未来大型高场磁体的候选材料，是用于聚变和电力传输的大型高场磁体的大容量电流电缆导体（CICC）的有希望的选择。通常，基于HTS的ccic由若干HTS电缆或由单个REBCO磁带组成的股制成。提出了一种由六芯圆芯电缆（CORCs）在花瓣铜制成线上对称螺旋绕组构成的中芯电缆结构。冷却介质分别在前两个中心通道和六个中心通道流动。虽然ccic一般工作在直流模式下，但至少在充放电过程中不可避免地会受到交流的影响，甚至会受到纹波电流的影响。因此，动态电阻的出现不仅会产生额外的交流损耗，而且会导致电流分布不均匀和不稳定。本文采用解析模型和数值模拟方法分别研究了不同绕组节距下CORC和CICC导体的动态电阻特性。建立了基于旋转磁场法的解析模型，有效地计算了单层CORC和CICC的动态电阻。在此基础上，建立了不同绕组节距下的CORC和CICC的三维模型。基于T-A公式，采用有限元法计算了绕组节距对动态电阻的影响。数值模拟结果与解析计算结果一致，表明绕组节距对动电阻有显著影响。该研究可为大型高场磁体的设计提供有价值的参考。

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Effect of winding pitches on dynamic resistance of CICC made from CORCs

The second generation (2G) high temperature superconducting (HTS) REBCO tapes, presently a unique possible candidate for use in future large high field magnets above 25 T, are promising choice for high capacity current cable-in-conduit conductor (CICC) used in large high field magnets of fusion and power transmissions. Generally, HTS based CICCs are made from several HTS cables or strands consisting of individual REBCO tapes. A configuration of CICC is proposed, which is made from six conductor on round core cables (CORCs) with symmetrically helical winding on a petal copper former. The cooling medium flows in central channels of former and six CORCs, respectively. Although the CICCs generally operate in DC mode, they inevitable endure AC influence at least in charging and discharging process or even ripple current. Consequently, the dynamic resistance appears, which not only generates additional AC loss but also importantly causes nonuniform current distribution and instability. This paper employs analytical model and numerical simulations to investigate the dynamic resistance characteristics of CORC and CICC conductors with different winding pitches respectively. An analytical model is established based on the rotating magnetic field method to efficiently compute the dynamic resistance of single-layer CORC and CICC. Subsequently, three-dimensional (3D) models of CORC and CICC with different winding pitches are established. Using finite element method, the influence of winding pitches on dynamic resistance are calculated based on the T-A formulation. Numerical simulation results are consistent with analytical calculations, demonstrating that winding pitch has a significant impact on dynamic resistance. This study can provide valuable reference for the design of large-scale high field magnets.

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来源期刊

Physica C-superconductivity and Its Applications 物理-物理：应用

CiteScore

2.70

自引率

11.80%

发文量

102

审稿时长

66 days

期刊介绍： Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.