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Status of Development and Field Test Experience with High-Temperature Superconducting Power Equipment

pubblicazioni - Memoria

Status of Development and Field Test Experience with High-Temperature Superconducting Power Equipment

By shifting the target of research and development from low temperature superconductivity (LTS) to high temperature superconductivity (HTS), HTS superconductivity (SC) power applications have been nearing the next stage of development.

They are now at a practical level of application with prototypes and field tests, etc. In recent years, Bi-based HTS development has reached a practical use and YBCO-based HTS has become a main target for HTS power developments and applications. As for HTS power applications, research and development include almost all power transmission and distribution equipment, such as cables, transformers, fault current limiters (FCL), rotating machines, magnetic energy storage (SMES), and so on; most of these are AC applications. Conventional functions will be extended with new SC functions. Common development features include HTS material development, such as higher critical current (Ic) and current density (Jc), low AC loss applications, cost reductions, compact size development, etc. In addition, as for common features among the equipment, cooling and electrical insulation are the most critical techniques to be resolved. Cooling techniques will directly contribute to above mentioned high Ic and Jc development, cost and size reduction performances. Conversely, electrical insulation will be a key common factor in the development of HTS power equipment and will contribute to size reduction, cost reduction, low loss applications, etc. Especially, because dielectric breakdown (BD) constitutes a fatal failure of this type of equipment, electrical insulation performance will be understood as critical for actual power applications. In recent years, worldwide HTS development projects have had a tendency to enhance operational voltage to become as high as conventional voltage, such as at the 145-300kV level. Under such situations and considering the status of development, HTS power applications are nearing prototype and field tests stages, leading to practical operations in the near future. In this report, state-of-the- art HTS development will be summarized and results of the prototype development and field tests will be introduced for the discussion of future HTS applications. In particular, technical views from both common techniques and peculiar techniques are based on individual equipment and systems, and are described in this brochure. The Technical Brochure (TB) introduces and discusses worldwide field-test experiences and state-of-the-art HTS power applications.

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