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1989 Fiscal Year Final Research Report Summary

Basic Study on Pulse Power Technique by Clarifying the Mechanism of Surface Flashover in Vacuum.

Research Project

Project/Area Number 63460110
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 電力工学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

HAYASHI Muneaki  Kyoto University, Electrical Eng., Prof., 工学部, 教授 (20025828)

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)
Project Period (FY) 1988 – 1989
KeywordsSurface Flashover / Surface Charge / Conditioning / Vacuum / Trace Distribution / 火花化成
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.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] O.Yamamoto: "Factors Affecting Surface Flashover in Vacuum" 13th International Symposium on Discharges and Electrical Insulation in Vacuum. 1. 250-252 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Yamamoto: "Effects of Spark Conditioning,Insulator Angle and Length on Surface Flashover in Vacuum" IEEE Trans.on Electrical Insulation. 24. 991-994 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山本修: "真空中の複合絶縁におけるスペ-サ効率とフラッシオ-バ機構" 電気学会論文誌A(投稿中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山本修: "真空沿面フラッシオ-バにおけるコンディショニング現象" 電気学会放電研究会資料. ED-89-41. 1-10 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Yamamoto, T.Hara, M.Hayashi et al.: "Factors Affecting Surface Flashover in Vacuum" 13th International Symposium on Discharges and Electrical Insulation in Vacuum, Vol.1, 250-252, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Yamamoto, T.Hara, M.Hayashi et al.: "Effects of Spark Conditioning, Insulation Angle and Length on Surface Flashover in Vacuum" IEEE Trans. on Electrical Insulation, Vol.24, No.6, 991-994, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Yamamoto, T.Hara, M.Hayashi et al.: "Insulation Performance and Flashover Mechanism of Bridged Vacuum Gaps" JIEE Trans.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-26  

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