| Project/Area Number |
10555091
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | GIFU NATIONAL COLLEGE OF TECHNOLOGY |
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Principal Investigator |
KOSAKI Masamitsu Gifu National College of Technology, President, 校長 (80023191)
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| Co-Investigator(Kenkyū-buntansha) |
MURAMOTO Yuji Toyohashi University of Technology, Department of Technology, Research Associate, 大学院・工学研究科, 助手 (70273331)
KOHONO Osamu Fujikura Ltd., Material Research, Laboratory, HEAD, 基盤材料研究所, 部長
TOKORO Tetsuro Gifu National College of Technology, Department of Electrical Engineering, Associate Professor, 電気工学科, 助教授 (10155525)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥12,800,000 (Direct Cost: ¥12,800,000)
Fiscal Year 1999: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1998: ¥8,400,000 (Direct Cost: ¥8,400,000)
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| Keywords | ethylene-propylene rubber / high temperature superconductor / extruded polymer insulation / DC superconducting power cable / treeing resistance / cryogenic Temperature / 直流超伝導ケーブル |
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| Research Abstract |
The investigators have been developing extruded ethylene-propylene rubber (EPR) insulated superconducting power cables. The model cable developed in this study had very simple structure : the silver sheathed bismuth type high temperature superconducting wires laid in parallel on a stabilizing core brass pipe is electrically insulated by wrapped EPR together with semiconducting shielding layers. The optimization of the layout of the superconducting wires on the core pipe gave their satisfactory contact with EPR insulation after repeated thermal cycles between room temperature (RT) and liquid nitrogen temperature (77K). This reveals that the radial, circumferential and length-wise thermal contractions of EPR at cooling do not affect the current characteristics of the superconducting wires. Hence the EPR insulation can be applied to the high temperature superconductors who are generally considered to be vulnerable to the mechanical stress. The dc critical current and quench current measurements also showed that they are only slightly affected by the mechanical stresses of the wrapped EPR insulation. The epoch-making fact is that DC superconducting cables can wipe out all the losses and drawbacks associated with AC version : hysteresis loss, eddy current loss, dielectric loss of insulation and partial discharges. Therefore the results obtained in this study open an avenue to the DC high temperature superconducting cables which can possibly play dominating roles in the future underground power transmission.
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