1996 Fiscal Year Final Research Report Summary
Development of the use exception and the systematic design technique of AC Superconductor
| Project/Area Number |
06555078
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | YOKOHAMA NATIONAL UNIVERSITY |
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Principal Investigator |
TSUKAMOTO Osami FACULTY OF ENGINEERING,YOKOHAMA NATIONAL UNIVERSITY,PROFESSOR, 工学部, 教授 (30017975)
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| Co-Investigator(Kenkyū-buntansha) |
MIYASHITA Katsumi SYSTEM MATERIAL LAB., HITACHI CABLE,Researcher, システムマテリアル研究所, 第一部研究員
AMEMIYA Naoyuki FACULTY OF ENGINEERING,YOKOHAMA NATIONAL UNIVERSITY,ASSISTANT PROFESSOR, 工学研究科, 助教授 (10222697)
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| Project Period (FY) |
1994 – 1996
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| Keywords | AC SUPERCONDUCTING COIL / NB3SN AC SUPERCONDUCTING CABLE / NB7I AC CABLE / SUPERCONDUCTING FILAMENT / AC DEGRADATION PHENOMENON / MAGNETIC INSTABILITY / QUENCH |
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| Research Abstract |
This fiscal year formulated the design technique of AC Superconductor that collected the research result so far in the last fiscal year of a plan for 3 years, and it responded with the classification of the application apparatus which is the last purpose of this research.
The cases (High magnetic-field application, Full superconducting generator, etc.) where the peak magnetic field of the external magnetic field to which a line is exposed is more than it, and in not more than (Low magnetic-field application : transformer, Current-limiter, etc.) it, application apparatus can be divided if it stands on the viewpoint of a design of an alternating-current super-conduction line.
Moreover, it can divide by low alternating-current loss priority or stability priority.
The design technique of the line material which was suitable for each according to the classified these apparatus was clarified.
Hereafter, the contents are summarized.
(1) Stabilization to magnetic instability
First, the conditions wh
… More
ich do not cause the magnetic instability to a self-magnetic field were searched for, and the validity was verified by the experiment.
Stable conditions were decided by the thickness of the filament domain of line section, critical current density, and the temperature margin, and the stabilization design of a line was attained according to the purpose.
(2) Clarification of the reduction technique of AC loss
In the high magnetic field, the loss resulting from the self-magnetic field and the external length magnetic field accompanied by transport is superior, and detailed-izing of the diameter of the filament and little-izing of the winding pitch which have been conventionally pursued in an AC superconductor.
In a low magnetic field the loss resulting from the self-magnetic field and the external length mangetic field accompanied by transport current is superior and detailed-izing of the diameter of a filament is not necessarily important.
Moreover, although seldom known conventionally, it found out that little-izing of a winding pitch was also effective in loss reduction.
By giving external magnetic-field conditions, the line design conditions which make loss by the low magnetic field the minimum were become clear.
(3) Stabilization to mechanical disctrbance
The relation with the occupancy area and the arrangement in the section of stabilization copper which governs loss and stability to mechanical discurbance is clarified, and it enabled it to have grasped trade-off of stability and loss quantitatively.
The details of the above result were summarized as the report. Less
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