Abstract
In order to establish a technology needed for a small-scale 100kWh SMES device, a SMES model coil was fabricated. Performance tests were carried out at the Japan Atomic Energy Research Institute (JAERI) in 1996. After that, the coil was installed in facilities of the Lawrence Livermore National Laboratory (LLNL) and tested in 1998, in collaboration between Japan and the United States. The AC loss results at LLNL were in good agreement with those at JAERI. It was reconfirmed from the results that the coupling loss of the coil consists of two components with short and long time constants. We found out from the signals of Hall probes that the current loops with long decay time constants were induced in the CIC conductor. These loops could enhance additional AC loss in the coil. To reduce the AC loss, we made small-sized CIC conductor of strands having a CuNi surface, a fabricated the small coil. The measured AC loss of the small coil was reduced to about 1/6. The CuNi surface on the strands was demonstrated to be effective to reduce AC loss in the coil.
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