Normal transition and stability characteristics of YBCO coated conductors under AC / pulse operation
| Project/Area Number |
16360136
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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 | 一般 |
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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 |
AMEMIYA Naoyuki Yokohama National University, Faculty of Engineering, Professor, 大学院工学研究院, 教授 (10222697)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGISHI Kazuhito Yokohama National University, Faculty of Engineering, Assistant, 大学院工学研究院, 助手 (10293177)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥15,000,000 (Direct Cost: ¥15,000,000)
Fiscal Year 2006: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 2005: ¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 2004: ¥4,400,000 (Direct Cost: ¥4,400,000)
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| Keywords | Superconductor / Yttrium / YBCO / Eddy Current / Quench / Stability / Alternating Current / Power Application |
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| Research Abstract |
S/N transition processes of monofilament / multifilament YBCO conductors as well as parallel conductors were studied experimentally and numerically, and the following results were obtained.
1)Ramp-up currents and AC over-currents were supplied to single YBCO conductors to study their S/N transition processes. It was found that the time-derivative of the supplied currents does not influence the S/N transition processes of single YBCO conductors. In case of AC over-current tests, a normal zone generated near the peak of the supplied current disappeared when the magnitude of the current decreased.
2)Two YBCO coated conductors were connected in parallel, and ramp-up currents were supplied to study their current sharing characteristics. Due to different contact resistances to the current lead, some current imbalance was observed in currents of two conductors. When the current of the conductor carrying more current became larger than its critical current, a normal zone was produced, and the current transferred to other conductor to influence their stability property.
3)S/N transition processes of monofilament / multifilament YBCO conductors were studied numerically by the combination of the electromagnetic field analysis and thermal analysis using FEM. It was found that the externally applied AC/pulse magnetic field substantially influences the current distribution on YBCO conductors but not substantially influences the temperature distribution and quench characteristics. Longitudinal distributions of critical currents do not substantially influence quench characteristics.
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Report
(4 results)
Research Products
(7 results)
