Research and Developments of High Current Joint with Low Resistance at Cryogenic Temperature

低温低电阻大电流接头的研究与进展

• 批准号: 10650297
• 负责人: YAMADA Shuichi
• 金额: $ 1.98万
• 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 Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650297/
• 关键词: HTS materials; YBCO; Contact resistance; Joints with low resistance; LHD; SC bus-lines; イットリウム系超伝導材料; ビズマス系超伝導材料; YBCOバルク材; 極低温接点材料

Research and developments of the high-current joint with low resistance at the cryogenic temperature have been conducted. The results are concluded as follows : (1) The voltage drop between the contact metals was studied as a function of the temperature of the coolant, the pressure of the contacting pieces and/or the current density. The use of the pure copper with large RRR (residual resistance ratio) is effective for the high-current splices, because it leads to increase of the thermal conduction, and to decrease of the Joule heat loss. (2) Two types of the 30 kA joint bus-bars have been developed ; one is stationary Cu bus-bar embedded of the SC wire, and another is a flexible joint by using NbTi/Cu superconductor. These joint bus-bars are applied in the SC current feeder system of the experimental fusion device, LHD.(3) We have developing the high Tc SC current feeders for the large scale SC coil system. The current carrying test of the prototype of the YBCO bulk conductor was successfully demonstrated up to 25 kA.

对低温低电阻大电流接头进行了研究和开发。（1）研究了接触金属间的电压降与冷却液温度、接触件压力和电流密度的关系。对于大电流接头，使用具有大RRR（剩余电阻比）的纯铜是有效的，因为它导致热传导增加，并减少焦耳热损失。(2)研制了两种30 kA母线接头，一种是埋有超导导线的固定式铜母线接头，另一种是采用NbTi/Cu超导体的柔性接头。这些母线应用于聚变实验装置LHD的SC馈电系统。(3)研制了适用于大型超导线圈系统的高温超导电流馈线。YBCO大块导体原型的载流测试成功地证明了高达25 kA。

项目成果

K.Maehata et al: "High current transport test of a YBCO bulk conductor up to 25 kA"IEEE Transactions on Applied Superconductivity. Vol.9. 1281-1284 (1999)

K.Maehata 等人：“高达 25 kA 的 YBCO 散装导体的高电流传输测试”IEEE 应用超导汇刊。

S.Yamada et al: "Overall operating characteristics of superconducting current-feeder system for the LHD"Advances in Cryogenic Engineering. Vol.45. 1525-1532 (2000)

S.Yamada 等人：“LHD 超导电流馈送系统的总体运行特性”低温工程进展。

S.Yamada, Y.Mito, R.Maekawa, H.Chikaraishi, A.Nishimura, A.Iwamoto, S.Moriuchi, K.Ohba et al: "Overall operating characteristics of superconducting current-feeder system for the LHD"Advabces in Cryogenic Engineering. Vol.45. 1525-1532 (2000)

S.Yamada、Y.Mito、R.Maekawa、H.Chikaraishi、A.Nishimura、A.Iwamoto、S.Moriuchi、K.Ohba 等人：“LHD 超导电流馈送系统的整体运行特性”Advabces in

S.Yamada et al: "Cool-down and current carrying properties of SC current-feeder system for the LHD"Fusion Engineering 1998 (Proc.20th SOFT). Vol.2. 1041-1044 (1998)

S.Yamada 等人：“LHD 的 SC 电流馈线系统的冷却和载流特性”Fusion Engineering 1998（Proc.20th SOFT）。

T.Mito et al: "Development of high Tc superconducting current feeders for a large-scale superconducting coil system"Journal of Nuclear Materials. Vol.258. 258-263 (1998)

T.Mito 等人：“用于大型超导线圈系统的高 Tc 超导电流馈送器的开发”核材料杂志。