Investigation of Quenching Phenomena at the Joint between AC Superconducting Cable and Normal Conducting Plate and Optimization of Joint

交流超导电缆与常导板接头淬火现象研究及接头优化

• 批准号: 06650327
• 负责人: TAKAHASHI Norio
• 金额: $ 1.22万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 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-06650327/
• 关键词: AC Superconducting Cable; Quench; Joint; 3-D Finite Element Method; 交流超電導; 超電導変圧器; ツイストピッチ; 輸送電流; 渦電流分布; 改良プロープ法

The quenching phenomena at the joint between ac superconducting cable and normal conducting plate is investigated and its joint is optimized by carrying out 3-D numerical analysis and experiments. The results obtained can be summarized as follows :1.Development for Analyzing 3-D Current Distribution at the Joint between AC Superconducting Cable nnd Normal Conducting PlateA new method for analyzing 3-D current distribution in the joint having such remarkable skin effect is developed by calculating impressed current and eddy current separately.2.Measurement of Current Distribution at Joint under Commercial FrequencyThe current distribution on the surface of the copper plate is measured using the modified probe method which is developed by us. As the output signal of the probe is very small (mu V order), homodyne method is used. The reason why the quenching occurs at the commercial frequency is also clarified by experiment.3.Optimization of JointThe optimal joint is investigated by examining the effects of the shape and dimension of joint on the concentration of current.4.Experimental VerificationThe optimal joint is produced, and the maximum current which flows in the optimal joint without quenching is clarified by experiment.

通过三维数值分析和实验，研究了交流超导电缆与普通导电板连接处的淬火现象，并对其连接处进行了优化设计。所得结果可总结如下：1。交流超导电缆与正导平台连接处三维电流分布分析的研究进展通过分别计算外加电流和涡流，提出了分析具有显著集肤效应的交流超导电缆与正导平台连接处三维电流分布的新方法。商用频率下接头电流分布的测量采用自行研制的改进探针法测量铜板表面的电流分布。由于探头的输出信号很小（μ V阶），所以采用纯差法。实验还阐明了淬火发生在商业频率的原因。接头的优化通过考察接头形状和尺寸对电流浓度的影响来研究最优接头。实验验证得出了最优接头，并通过实验明确了在不淬火的情况下在最优接头中流过的最大电流。

项目成果

N.Takahashi: ""Numerical and Experimental Investigations of Current Distribution at the Joint between AC Superconducting Cable and Normal Conducting Plate"" IEEE Trans.on Magnetics. vol.32, no.4. (1996)

N.Takahashi：“交流超导电缆和普通导电板之间的连接处电流分布的数值和实验研究”，IEEE Trans.on Magnetics。

高橋則雄: "アモルファス金属薄帯の低温時の鉄損特性" 平7電気学会全国大会. (1995)

Norio Takahashi：“非晶金属带材在低温下的铁损特性”1995年日本电气工程师学会全国会议（1995）。

N.Takahashi: ""Calculation of Current Dstribution at Joint between AC Superconducting Cable and Copper Plate"" Papers of National Convention of IEE of Japan. 1129. (1995)

N.Takahashi：“交流超导电缆与铜板连接处的电流分布计算”日本IEE全国大会论文。

N.Takahashi: ""Effect of Joint between AC Superconducting Cable and Normal Conducting Plate on Current Distribution"" Papers of Spring Convention of Cryogenic Society of Japan. 95. (1995)

N.Takahashi：““交流超导电缆与普通导电板之间的连接对电流分布的影响””日本低温学会春季会议论文。

高橋則雄: "電磁界解析の方法とその応用" 電気学会論文誌D. 115. 1-12 (1995)

高桥则夫：“电磁场分析方法及其应用”，日本电气工程师学会汇刊 D. 115. 1-12 (1995)