STUDY ON THE EFFECT OF THE CURRENT DISTRIBUTION ON STABILITY OF A SUPERCONDUCTING MULTI-STRANDED CABLE.

电流分布对超导多股电缆稳定性影响的研究。

• 批准号: 06452207
• 负责人: MITO Toshiyuki
• 金额: $ 4.29万
• 依托单位: NATIONAL INSTITUTE FOR FUSION SCIENCE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452207/
• 关键词: Superconductor; Stranded cable; Current sharing; Stability; ケーブルインコンジット; 成型撚線

The stability of a multi-stranded superconducting cable is strongly influenced by the initial current distribution among strands and the transient current sharing after a quench of a part of stands. At first, we researched the previous studies about the stability of a multi-stranded superconducting cable. It became clear that the small deviation of the inductance of each strands for a cable in conduit conductors (CICC) may cause the large unbalance of the current distribution among strands. However, there are not enough studies which can explain the relation between the current distribution of a multi-stranded cable and its stability. We studied experimentally the characteristics of the current transfer and stability of a two-strands cable. The current transfer from the quench strand to the other strand is faster than the heat transfer between strands, when the surfaces of strands are naturally oxidized without an insulation coating. The stability of a two-strands cable becomes higher … More than that of a monolith cable because of the effect of the transient heat transfer to a liquid helium. Then a triplet superconducting cable without any coating on its surface has been used to study the influences of the current distribution within the triplet on its stability. The Minimum Quench Energies (MQE) have been measured with different initial current distributions within the triplet. It became clear that the initial current distribution, which can maximize the MQE,changes with the external magnetic fields, the total transport current and the time duration of heat inputs. The same complicated relations between the current sharing properties within the cables were obtained in the experiments of the compacted strand cable with different matrix structures and different crossover resistance. The minimum quench energies of the cable with low crossover resistance were not always larger than those of the cale with high crossover resistance. Above experimental results showed that the stability of the superconducting cable is affected with not only the current distribution properties but also other parameters such as the stability margin of a single strand, the heat transfer properties between strands and the cooling conditions. It is necessary to design the superconducing cable according to the condition of the real use of the superconducting coils. Less

多股超导电缆的稳定性受各股之间的初始电流分布和部分架子失超后的暂态电流分配的影响很大。首先，我们对多股超导电缆的稳定性进行了研究。很明显，电缆在导管导体(CICC)中每股电感的微小偏差可能会导致各股之间电流分布的严重不平衡。然而，目前还没有足够的研究来解释多股电缆的电流分布与其稳定性之间的关系。对双股电缆的电流传递和稳定性进行了实验研究。当钢绞线表面在没有绝缘涂层的情况下自然氧化时，从淬火钢绞线到另一股钢绞线的电流传递要比钢绞线之间的热传递快。双股电缆的稳定性变得更高…由于对液氦的瞬时热传递的影响，它比整体电缆的性能更好。然后用表面无涂层的三股超导电缆研究了三股线内部的电流分布对其稳定性的影响。测量了三重态中不同初始电流分布下的最小失超能(MQE)。结果表明，使MQE最大的初始电流分布随外加磁场、总输运电流和热输入时间的变化而变化。对不同母体结构和不同跨越电阻的紧凑型绞线进行了实验，得到了电缆内部均流特性之间的复杂关系。低交叉电阻电缆的最小失超能量并不总是大于高交叉电阻电缆的最小失超能量。上述实验结果表明，超导电缆的稳定性不仅受电流分布特性的影响，还与单股的稳定裕度、线股间的换热特性和冷却条件等参数有关。根据超导线圈的实际使用情况，设计超导电缆是十分必要的。较少

项目成果

A. Kimura: "Stabilities of the Rutherford Cables with Cu Matrix and CuMn Barrier" IEEE Transactions on Applied Superconductivity. vol.5 No.2. 385-388 (1995)

A. Kimura：“Cu 基体和 CuMn 势垒的卢瑟福电缆的稳定性”IEEE 应用超导汇刊。

S.W.KIM: "Experimental Studies on Stabilities of Rutherford Cables for Superconducting Accelerator Magnets" IEEE Tranasactions on Magnetics Proceedings for MT-14. (発表予定). (1996)

S.W.KIM：“超导加速器磁体卢瑟福电缆稳定性的实验研究”IEEE Transactions on MT-14 磁学论文集（即将发表）。

A.Kimura: "Stabilities of the Rutherford Cables with Cu Matrix and CuMn Barrier" IEEE Transactions on Applied Superconductivity. Vol.5, No.2. (1995)

A.Kimura：“Cu 基体和 CuMn 势垒的卢瑟福电缆的稳定性”IEEE 应用超导汇刊。

S. W. Kim: "Experimental Studies on Stabilities of Rutherford Cables for Superconducting Accelerator Magnets" IEEE Transactions on Magnetics Conference issue for 14th International conf. on Magnet Technology. (発表予定). (1996)

S. W. Kim：“超导加速器磁体卢瑟福电缆稳定性的实验研究”第 14 届国际磁体技术会议的 IEEE 期刊（即将发表）。

S. W. Kim: "Studies on Stabilities of Superconducting Rutherford Cables" Proceeding of the CEC/ICMC Columbus, ohio, U. S. A. , July, 1995. (発表予定). (1996)

S. W. Kim：“超导卢瑟福电缆稳定性研究”美国俄亥俄州哥伦布 CEC/ICMC 会议记录，1995 年 7 月。（待出版）。