| Project/Area Number |
63460110
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電力工学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
HAYASHI Muneaki Kyoto University, Electrical Eng., Prof., 工学部, 教授 (20025828)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Osamu Kyoto Univ., Electrical Eng., Instructor, 工学部, 助手 (70093333)
HARA Takehisa Kyoto Univ., Electrical Eng., Associate Prof., 工学部, 助教授 (20026214)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 1989: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1988: ¥3,700,000 (Direct Cost: ¥3,700,000)
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| Keywords | Surface Flashover / Surface Charge / Conditioning / Vacuum / Trace Distribution / 火花化成 / 真空沿面フラッシオーバ / スペーサ / コンディショニング / 放電痕 |
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| Research Abstract |
The insulation performance and the flashover mechanism of a vacuum gap bridged by an insulator in the shape of a conical frustum has been studied. The cone angle of the insulator is varied from 0 to 45 degrees, and the thickness of the insulator is varied from 5 to 15 mm. The gap is subjected to impulse voltages. The insulation performance is investigated by observing the ratio of the flashover voltage of the bridged gap to that of the gap without insulators. The flashover mechanism is investigated by observing the distribution of traces on the cathode due to flashovers and by analyzing the electric field near the insulator-cathode junction. Charging of the insulator due to electron collision on its surface is considered in this analysis. As the results, it is found that the ratio is greater than 90% for a cone angle greater than a critical one, when the top of the frustum is subjected to the positive impulses. It is also found that the trace distribution is closely related to the insulation performance.
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