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Streaming electrification of cryogenic fluid/polymer insulator composite insulation system and evaluation of electrical insulation capability of the system

Research Project

Project/Area Number 15560275
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionNagoya Institute of Technology

Principal Investigator

MIZUNO Yukio  Nagoya Institute of Technology, School of Engineering, Professor, 工学研究科, 教授 (50190658)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsLiquid nitrogen / Polymeric material / Streaming electrification / Faraday cage / Pipe / Filter / Surface potential / Flashover voltage
Research Abstract

1.Electrification of liquid nitrogen flowing through PVC pipes
(1)Electrification was confirmed for liquid nitrogen after flowing through a poly-vinyl-chloride(PVC) pipe. Liquid nitrogen was charged positive. The amount of charge is much smaller compared with that reported for electrical insulating oil.
(2)The amount of charge of liquid nitrogen after flowing PVC pipe became larger with increase of volume of liquid nitrogen. Higher flowing rate of liquid nitrogen resulted in increase in the amount of charge. The amount of charge increased and then leveled off with increase of the length of PVC pipe.
(3)In the case of L-shaped PVC pipe, the amount of charge of flowing liquid nitrogen was larger when the length was longer between the inlet of liquid nitrogen and the elbow of L-shaped pipe.
2.Electrification of liquid nitrogen flowing through PVC pipe with solid insulating materials or filters
(1)Existence of solid insulating material increased the amount of charge of liquid nitrogen flowing i … More n the pipe. The amount of charge increased with the number of insulating materials and then leveled off. The area of contact between liquid nitrogen and the insulating material becomes larger with increase in the number of the insulating materials, but velocity of liquid nitrogen reduces under the condition with many insulating materials.
(2)When a filter was installed in the path of liquid nitrogen, the amount of charge of liquid nitrogen increased. The amount of charge depended on the material of the filter. Liquid nitrogen was charged negative with a copper filter, while charged positive with polymeric filters. This result agrees with the order of electrification of materials.
3.Surface potential of sold insulating material placed in flowing liquid nitrogen
(1)Surface potential increased first and then decreased gradually by repetitive flowing of liquid nitrogen. It was suggested that frost and/or ice on the surface of measuring point, which was formed after several cycles, played a role to escape surface charge formed by streaming electrification.
(2)Distribution of potential on the surface of insulating material is complicated. It seemed that surface potential at the upward position was higher than that at the downward, suggesting that interaction between the insulating material and flowing liquid nitrogen was stronger at the upward side due to high flowing velocity.
4.Flashover voltage of solid insulating material immersed in liquid nitrogen
Lower flashover voltage was obtained for insulating material with surface charge. It may be attributed to local electric field enhancement caused by surface charge. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (22 results)

All 2005 2004 2003 Other

All Journal Article (18 results) Publications (4 results)

  • [Journal Article] 絶縁パイプ中を流れる液体窒素の帯電(第2報)2005

    • Author(s)
      野田敏広
    • Journal Title

      平成17年電気学会全国大会講演論文集 2

      Pages: 85-85

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 液体窒素漬浸高分子の沿面放電への表面電荷の影響2005

    • Author(s)
      岡田大和
    • Journal Title

      平成17年電気学会全国大会講演論文集 2

      Pages: 86-86

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Electrification of liquid nitrogen flowing in insulating pipe(Report No.2)2005

    • Author(s)
      Toshihiro Noda et al.
    • Journal Title

      National Convention Record, The Institute of Electrical Engineers of Japan Vol.2

      Pages: 85-85

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of surface electrification on flashover voltage of polymeric rod immersed in liquid nitrogen2005

    • Author(s)
      Hirokazu Okada et al.
    • Journal Title

      National Convention Record, The Institute of Electrical Engineers of Japan Vol.2

      Pages: 86-86

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 液体窒素流動時の絶縁パイプの帯電現象2004

    • Author(s)
      岡田大和
    • Journal Title

      平成16年電気学会全国大会講演論文集 2

      Pages: 31-31

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] フィルタを通過する液体窒素の流動帯電2004

    • Author(s)
      野田敏広
    • Journal Title

      平成16年電気学会全国大会講演論文集 2

      Pages: 32-32

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Streaming electrification of liquid nitrogen through electrical insulating pipe2004

    • Author(s)
      Yukio Mizuno
    • Journal Title

      Annual Report Conference on Electrical Insulation and Dielectric Phenomena

      Pages: 134-137

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 金属パイプ中を流れる液体窒素の流動帯電2004

    • Author(s)
      野田敏広
    • Journal Title

      2004年度電気関係学会東海支部連合大会講演論文集

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 液体窒素流動時の絶縁パイプの帯電現象(第2報)2004

    • Author(s)
      岡田大和
    • Journal Title

      2004年度電気関係学会東海支部連合大会講演論文集

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Electrification of insulation pipe by flowing liquid nitrogen2004

    • Author(s)
      Hirokazu Okada et al.
    • Journal Title

      National Convention Record, The Institute of Electrical Engineers of Japan Vol.2

      Pages: 31-31

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Streaming electrification of liquid nitrogen flowing through filters2004

    • Author(s)
      Toshihiro Noda et al.
    • Journal Title

      National Convention Record, The Institute of Electrical Engineers of Japan Vol.2

      Pages: 32-32

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Streaming electrification of liquid nitrogen through electrical insulating pipe2004

    • Author(s)
      Yukio Mizuno et al.
    • Journal Title

      Annual Report Conference on Electrical and Dielectric Phenomena

      Pages: 134-137

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Streaming electrification of liquid nitrogen flowing through metal pipe2004

    • Author(s)
      Toshihiro Noda et al.
    • Journal Title

      Record of Tokai-Section Joint Conference of the Eight Institutes of Electrical and Related Engineers No.O-053

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electrification of insulating pipe by flowing of liquid nitrogen(Report No.2)2004

    • Author(s)
      Hirokazu Okada et al.
    • Journal Title

      Record of Tokai-Section Joint Conference of the Eight Institutes of Electrical and Related Engineers No.O-055

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electrification of liquid nitrogen flowing in electrical insulating pipe2003

    • Author(s)
      Yukio Mizuno
    • Journal Title

      Annual Report Conference on Electrical Insulation and Dielectric Phenomena

      Pages: 229-232

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 絶縁パイプ中に固体絶縁物がある場合の液体窒素の流動帯電2003

    • Author(s)
      岡田大和
    • Journal Title

      2003年度電気関係学会東海支部連合大会講演論文集

      Pages: 121-121

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electrification of liquid nitrogen flowing in electrical insulating pipe2003

    • Author(s)
      Yukio Mizuno et al.
    • Journal Title

      Annual Report Conference on Electrical and Dielectric Phenomena

      Pages: 229-232

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Streaming electrification of liquid nitrogen flowing in electrical insulating pipe installed solid insulating materials2003

    • Author(s)
      Hirokazu Okada et al.
    • Journal Title

      Record of Tokai-Section Joint Conference of the Eight Institutes of Electrical and Related Engineers

      Pages: 121-121

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Yukio Mizuno: "Electrification of liquid nitrogen flowing in electrical insulating pipe"Annual Report Conference on Electrical Insulation and Dielectric Phenomena. 229-232 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 岡田大和: "絶縁パイプ中に固体絶縁物がある場合の液体窒素の流動帯電"2003年度電気関係学会東海支部連合大会講演論文集. 121 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 岡田大和: "液体窒素流動時の絶縁パイプの帯電現象"平成16年電気学会全国大会講演論文集. 2. 31 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 野田敏広: "フィルタを通過する液体窒素の流動帯電"平成16年電気学会全国大会講演論文集. 2. 32 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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