• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Ultimate Design in Insulation for Non-Standard Impulse Voltages Based on Mechanism of Discharges

Research Project

Project/Area Number 60460112
Research Category

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

Allocation TypeSingle-year Grants
Research Field 電力工学
Research InstitutionUniversity of Tokyo

Principal Investigator

KAWAMURA Tatsuo (1986)  Institute of Industrial Science, University of Tokyo, Professor, 生産技術研究所, 教授 (20013097)

河村 達雄  東京大学, 生産技術研究所, 教授

Co-Investigator(Kenkyū-buntansha) MATSUMOTO Takaie  Faculty of Engineering, Shizuoka University, Associate Professor, 工学部, 助教授 (40157368)
HOJO Jun'ichi  Institute of Industrial Science, Univ. of Tokyo, Research Assistant, 生産技術研究所, 助手 (70013175)
ISHII Masaru  Institute of Industrial Science, Univ. of Tokyo, Associate Professor, 生産技術研究所, 助教授 (40107397)
HARASHIMA Fumio  Institute of Industrial Science, Univ. of Tokyo, Professor, 生産技術研究所, 教授 (60013116)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1986: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1985: ¥5,500,000 (Direct Cost: ¥5,500,000)
KeywordsElectric Power System / Insulation Design / Impulse Voltage / 放電機構
Research Abstract

For the purpose of investigating the current waveform of natural lightning as one of the sources to induce surge voltages in the electric power system, measurements of electric and magnetic fields have been carried out. Comparing these waveforms with lightning waveforms already published, the rising part of the lightning current waveform has tuned out to be convex instead of concave, which has been known as the standard lightning impulse voltage waveform.
Based on these results, an impulse generator with charging voltage of 200kV capable of generating a non-standard impulse voltage similar to a lightning current waveform has been constructed. This device can generate a waveform with a convex rising wave front by using a non-linear circuit element.
Non-standard lightning impulse voltages were applied to a 10cm rod-plane airgap. Luminous phenomena were observed by an image converter camera. Together with this observation, 50% flashover voltages were determined and were compared with the da … More ta for a standard lightning impulse voltage. The results showed that the waveform of the rising front did not much affect the flashover voltage which was confirmed from the standpoint of the physical mechanism of the electrical discharge.
Concerning the switching surge generated in the electric power system, statistics of switching surge waveforms has been studied. The temporal distribution of space charge in the pre-discharge process of breakdown of a long airgap, related to the discharge mechanism under phase-to-phase switching surges, was determined by measurement of electric fields by using Pockels' cells suspended in the gap.
Based on the flashover characteristics of airgaps for waveforms of non-standard switching impulse voltages, a method of accurately determining flashover probability of a transmission line has been proposed. Moreover, the insight to realize the ultimate design in the insulation of electric power systems has been obtained by combining the results together with the experimental data for the non-standard lightning impulse voltages. Less

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] J.Hojo;M.Ishii;T.Kawamura;F.Suzuki;R.Funayama: Journal of Geophysica Research. 90,D. 6139-6143 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 河村達雄: 電気評論. 70. 610-616 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] J.Ozawa;E.Ohsaki;M.Ishii;S.Kojima;H.Ishihara;T.Kouno;T.Kawamura: IEEE Transactions on Power Apparatus and Systems. PAS-104. 2244-2254 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Kawamura;T.Matsumoto;M.Ishii;T.Hisada: IEE Proceedings. 133,Pt.A. 573-576 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] J. Hojo, M. Ishii, T. Kawamura, F. Suzuki, R. Funayama: "The fine structure in the field change produced by positive ground flashes." Journal of Geophysical Research. 90, D. 6139-6143 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Kawamura: "Analysis of lightning surges and insulation design against lightning. (in Japanese)" Electrical Review. 70. 610-616 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] J. Ozawa, E. Ohsaki, M. Ishii, S. Kojima, H. Ishihara, T. Kouno, T. Kawamura: "Lightning surge analysis in a multi-conductor system for insulation design." IEEE Transactions on Power Apparatus and Sustems. PAS-104. 2244-2254 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Kawamura, T. Matsumoto, M. Ishii, H. Hisada: "Evaluation of space-charge behavior in long airgap using Pockels' cells." IEE Proceedings. 133, Pt. A. 573-576 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

URL: 

Published: 1987-03-31   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi