U.S.-Japan Cooperative Science: AC Electrical Power Applications of High-Temperature Superconductors: AC Loss Measurements and Analysis, and Conductor Development

9980688克莱姆该奖项支持爱荷华州立大学约翰·克莱姆教授和日本横滨大学津本修三年的合作研究项目。研究人员将对交流损耗测量和分析以及导体开发进行研究。目前，高温超导复合导体在交流输电电缆、变压器、发电机和电机等各种电力应用中的发展引起了全世界的兴趣。对于参与高温超导电力应用研发的人来说，交流损耗是一个越来越令人担忧的问题。重要的是要通过导体和使用导体的装置的良好设计来找到使交流损耗最小化的方法。这项研究的具体目标是：1)开发在模拟大型电力设备的电磁环境中测量交流损耗的仪器，如输电电缆和电力变压器。2)发展分析和数值方法来计算高温超导导体和电力设备中的交流损耗；3)研究27K-90K温度范围内交流损耗的温度依赖性；4)研究交流损耗与导体中冶金微观和宏观结构的关系；以及5)利用这些研究的知识来辅助开发交流损耗降低的导体。该项目汇集了两个拥有互补专业知识和研究能力的实验室的努力。高温超导体在电力系统中应用的预期未来好处包括：1)提高能源效率；2)通过提高效率减少二氧化碳排放，消除现有设备可能发生的意外有毒排放，从而改善大气质量；以及3)大幅增加载流能力，缩小输电电缆、变压器、电机和发电机的尺寸。这项研究通过博士后和研究生的参与促进了国际人力资源的发展。通过思想和技术的交流，这个项目将扩大我们的基础知识基础，促进国际理解与合作。研究人员计划在科学期刊上发表研究结果。

9980688ClemThis award supports a three-year collaborative research project between Professor John Clem of Iowa State University and Professor Osami Tsukamoto of Yokohama University in Japan. The researchers will be undertaking a study of AC loss measurements and analysis, and conductor development. There currently is worldwide interest in the development of high-temperature superconducting composite conductors for various electric power applications, such as ac power transmission cable, transformers, generators, and motors. The subject of ac losses is a matter of growing concern to those involved in R&D in electric power applications of high-temperature superconductivity. It is important to find ways of minimizing the ac losses through good design of both the conductor and the device in which the conductor will be used. The specific objectives of this study are: 1) to develop apparatus to measure ac losses in electromagnetic environments that simulate large-scale electrical power devices; such as power transmission cables and electrical transformers. 2) to develop analytical and numerical methods to calculate ac losses in HTS conductors and electrical power devices; 3) to study the temperature dependence of ac losses in the temperature range 27K - 90K; 4) to investigate the relationship between the ac losses and the metallurgical micro- and macrostructures in the conductors; and 5) to assist in development of conductors with reduced ac losses utilizing the knowledge from these studies. The project brings together the efforts of two laboratories that have complementary expertise and research capabilities. Expected future benefits of applications of high-temperature superconductors in electric power systems include: 1) increased energy efficiency; 2) improvement of atmospheric quality by reducing CO2 emission via enhanced efficiency and by eliminating the possibility of accidental toxic discharges, which can occur with present devices; and 3) reducing the size of power transmission cables, transformers, motors, and generators resulting from the greatly increased current-carrying capacity. This research advances international human resources through the participation of postdocs and graduate students. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. The researchers plan to publish results of the research in scientific journals.