Studies on high Tc superconductors for power transmission line

输电线路用高温超导体研究

• 批准号: 08044136
• 负责人: SUGAHARA M.
• 金额: $ 7.3万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044136/
• 关键词: High temperature superconductor; AC loss; Multifilament wire; AC transport current loss; Assembled conductor; Bi silver sheathed tape; Tape conductor; ビスマス; イットリウム; 溶融法; 高温酸化物超伝導導体

High efficiency and I or compact power transmission lines can be realized by the application of high Tc superconductors. The reduction of their AC losses is a key issue for the application of high Tc superconductors to power transmission lines. In this work, AC losses of HTS tapes and assembled conductors were measured and their electromagnetic phenomena were studied to reduce their AC losses. The transport loss measurement of HTS tape revealed the influence of n-value and critical current density profile in the wire cross section on the transport loss. The transport loss decreases with increasing n-value and increasing critical current density in the peripheral region of the tape. The measured magnetization losses agree well with the numerical results. The total AC loss of HTS tapes carrying AC transport current in the AC external magnetic field was calculated by the finite element method. The total AC loss of twisted multifilamentary tapes can be minimized by the optimization of their twist pitch. The optimum twist pitch is around 10 mm. The AC loss of a conductor assembled with eight HTS tapes was measured. The influence of the adjacent tapes on the AC loss was studied. The AC loss in a tape in assembled conductor is smaller than the AC loss in a single tape.

高T_c超导体的应用可以实现高效率和紧凑型输电线路。降低交流损耗是高温超导体应用于输电线路的关键问题。本工作测量了高温超导带材和组合导体的交流损耗，并研究了它们的电磁现象，以降低它们的交流损耗。高温超导带材的传输损耗测量揭示了导线横截面上n值和临界电流密度分布对传输损耗的影响。传输损耗随着n值的增大和带材周边区域的临界电流密度的增大而减小。测量的磁化损耗与数值计算结果吻合较好。用有限元方法计算了载流高温超导带材在交流外磁场中的交流总损耗。多丝缠绕带的总交流损耗可以通过优化其缠绕节距来最小化。最佳扭距为10 mm左右。测量了由8根高温超导带材组装而成的导体的交流损耗。研究了相邻磁带对交流损耗的影响。组装导线的带子中的交流损耗小于单个带子中的交流损耗。

项目成果

O.Tsukamoto: "Dependence of AC transport Current Losses of HTS wires on Their Structures and Synthesizing Processes" to be published in IEEE Trans.on ASC.(1999)

O.Tsukamoto：“高温超导线的交流传输电流损耗对其结构和合成过程的依赖性”将在 IEEE Trans.on ASC 上发表。(1999)

O.Tsukamoto, S.Ishii, Y.Kito, S.Fukui, H.Mukai, J.Fujikami, K.Sato: "AC transport current loss of assembled conductor of HTS tapes" Physica. C310. 197-201 (1998)

O.Tsukamoto、S.Ishii、Y.Kito、S.Fukui、H.Mukai、J.Fujikami、K.Sato：“高温超导带组装导体的交流传输电流损耗”Physica。

M.Sugahara: "Film Thickness Dependence of Anomalous Dielectric Property Found in C-Axis Oriented La2-xSrxCuO4 Film with Localization" to be published in Proceedings of 11th Internationl Symposium on Superconductivity (ISS'98) , Fukuoka, 1998.

M.Sugahara：“Film Thickness Dependence of Anomalyous Dielectric Property Found in C-Axis Oriented La2-xSrxCuO4 Film with Localization”将发表于第 11 届国际超导研讨会论文集 (ISS98)，福冈，1998 年。

S.Fukui: "TRANSPORT CURRENT AC LOSSES OF HIGH-Tc SUPERCONDUCTING TAPES EXPOSED TO AC MAGNETIC FIELD" to be published.(Presented at CEC/ICMC,1997,Portland).

S.Fukui：“暴露于交流磁场的高温超导带的传输交流电流损失”即将出版。（在 CEC/ICMC，1997 年，波特兰发表）。

N.Amemiya: "Finite element analysis of AC loss in non-twisted Bi-2223 tape carrying AC or AC transport current and/or exposed to DC extemal magnetic field" Physica C:Superconductivity. 310. 30-35 (1998)

N.Amemiya：“承载交流或交流传输电流和/或暴露于直流外部磁场的非扭曲 Bi-2223 磁带中交流损耗的有限元分析”Physica C：超导。