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Electrical and Environmental Aging of Silicone Rubber

Research Project

Project/Area Number 11650278
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 電力工学・電気機器工学
Research InstitutionAKITA UNIVERSITY

Principal Investigator

YOSHIMURA Noboru  Akita Univ., Faculty of Engineering and Resource Science, Prof., 工学資源学部, 教授 (60006674)

Co-Investigator(Kenkyū-buntansha) WANG Xinsheng  Akita Univ., Faculty of Engineering and Resource Science, Lecturer, 工学資源学部, 講師 (90292359)
SUZUKI Masafumi  Akita Univ., Faculty of Engineering and Resource Science, Associate Prof., 工学資源学部, 助教授 (60226553)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsUV radiation / corona discharges / acid rain / sources of the aging
Research Abstract

This is a laboratory study on the aging of SIR and hydrophobicity recovery. UV radiation, corona discharges, acid rain, dry-band arcing are employed as sources of the aging. Chemical and morphological analysis is used to detect the surface chemical and structural changes derived from these stresses. The nature of highly mobile low molecular weight (LMW) chains achieving a quick recovery of the hydrophobicity is carefully examined. Their generation and extinction caused by these stresses are investigated.
It is found that hydrophobic transfers of SIR resulting from electrical and environmental stresses are investigated as a clue to draw their aging scenarios and estimate their lifetimes. Roles of UV radiation, corona discharges and dry-band arcing during the aging is clearly identified. It is shown that oxidation that induces crosslinking, branching, interchanging in PDMS are the most dominant chemical reactions. Furthermore, highly mobile LMW chains (cyclic silicone oligomers of 4 to 6 … More molecular units) play a significant role to regain the hydrophobicity temporarily lost by electrical and environmental stresses. However, with the development of oxidation, silanol groups are formed, which are byproducts of oxidation, and they prevent highly mobile LMVV chains from migrating onto hydrophilic layers. Moreover, highly mobile LMW chains decrease due to crosslinking and their evaporation. When the recovery of SIR worsens, the above chemical reactions should take place. Hence, the atomic presence of oxygen at the surface can be a helpful indication to determine the aging level of SIR.However, in this case, ESCA able to analyze very shallow layer of material surfaces (<10 nm) would not be useful because mobile LMW chains hide the aged surfaces. EDX with high accelerating voltage to penetrate deeply into the sample (mere than 1 μm) would be convenient. The amount of cyclic silicone oligomers in the rubber is also significant information to predict the lifetimes. From all the information regarding their aging up to now, this study could draw a typical scenario of all lives of SIR used for outdoor HV insulation. This scenario proposed will be verified by the future test results of field aging. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] X.Wang and N.Yoshimura: "Resistance to Tracking and Erosion of Silicone Rubber Materials under Various Types of Precipitation"Japanese Journal of Applied Physics. Vol.38・No.9A. 5170-5175 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Yoshimura,S.Kumagai and S.Nishimura: "Electrical and Environmental Aging of Silicone Rubber Used in Outdoor Insulation"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.6・No.5. 632-650 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] X.Wang and N.Yoshimura: "Fractal Phenomena Dependence of Hydrophobicity on Surface Appearance and Structural Features of SIR Insulators"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.6・No.6. 781-791 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] X.Wang,L.Chen and N.Yoshimura: "Relation of Hydrophobicity of Silicone Rubber Insulation under Various Contaminant Conditions"Proceedings of The 6th International Conference on Properties and Applications of Dielectric Materials. 383-386 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai and N.Yoshimura: "Evaluation of Leakage Current on Various Types of Polymeric Materials Used for HV Outdoor Insulation in Salt-fog Condition"電気学会論文誌. 120巻・11号. 1051-1055 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai,M.Suzuki and N.Yoshimura: "Electrical Performances of RTV Silicone Rubber Coatings in Salt-fog and Rotating Wheel Dip Tests"電気学会論文誌A. 121巻・4号(掲載決定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai,M.Suzuki and N.Yoshimura: "Material Screening and Evaluation for Silicone Rubber Insulation with Simple Methods"電気学会論文誌A. 121巻・4号(掲載決定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai and N.Yoshimura: "Tracking and Erosion of HTV Silicone Rubbers Filled with Alumina Trihydrate"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.8・No.2(掲載決定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] X.Wang and N.Yoshimura: "Resistance to Tracking and Erosion of Silicone Rubber Materials under Various Types of Precipitation"Japanese Journal of Applied Physics. Vol.38, No.9A. 5170-5175 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Yoshimura, S.Kumagai and S.Nishimura: "Electrical and Environmental Aging of Silicone Rubber Used in Outdoor Insulation"IEEE Transactions of DIELECTRICS and Electrical Insulation. Vol.6, No.5. 632-650 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] X.Wang and N.Yoshimura: "Fractal Phenomena Dependence of Hydrophobicity on Surface Appearance and Structural Features of SIR Insulators"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.6, No.6. 781-791 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] X.Wang, L.Chen and N.Yoshimura: "Relation of Hydrophobicity of Silicone Rubber Insulation under Various Contaminant Conditions"Proceedings of The 6th International Conference on Properties and Applications of Dielectric Materials. 383-386 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai and N.Yoshimura: "Evaluation of Leakage Current on Various Type of Polymeric Materials Used for HV Outdoor Insulation in Salt-fog Condition"IEE of Japan. Vol.120, No.11. 1051-1055 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai, M.Suzuki and N.Yoshimura: "Electrical Performances of RTV Silicone Rubber Coatings in Salt-fog and Rotating Wheel Dip Tests"IEE of Japan. Vol.121, No.4(Submitted). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai, M.Suzuki and N.Yoshimura: "Material Screening and Evaluation for Silicone Rubber Insulation with Simple Methods"IEE of Japan. Vol.121, No.4(Submitted). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Kumagai and N.Yoshimura: "Tracking and Erosion of HTV Silicone Rubbers Filled with Alumina Trihydrate"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.8, No.2 (Submitted). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] X.Wang and N.Yoshimura: "Resistance to Tracking and Erosion of Silicone Rubber Materials under Various Types of Precipitation"Japanese Journal of Applied Physics. Vol.38・No.9A. 5170-5175 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Yoshimura,S.Kumagai and S.Nishimura: "Electrical and Environmental Aging of Silicone Rubber Used in Outdoor Insulation"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.6・No.5. 632-650 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] X.Wang and N.Yoshimura: "Fractal Phenomena Dependence of Hydrophobicity on Surface Appearance and Structural Features of SIR Insulators"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.6・No.6. 781-791 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] X.Wang,L.Chen and N.Yoshimura: "Relation of Hydrophobicity of Silicone Rubber Insulation under Various Contaminant Conditions"Proceedings of The 6th International Conference on Properties and Applications of Dielectric Materials. 383-386 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Kumagai and N.Yoshimura: "Evaluation of Leakage Current on Various Types of Polymeric Materials Used for HV Outdoor Insulation in Salt-fog Condition"電気学会論文誌. 120巻・11号. 1051-1055 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Kumagai,M.Suzuki and N.Yoshimura: "Electrical Performances of RTV Silicone Rubber Coatings in Salt-fog and Rotating Wheel Dip Tests"電気学会論文誌A. 121巻・4号(掲載決定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Kumagai,M.Suzuki and N.Yoshimura: "Material Screening and Evaluation for Silicone Rubber Insulation with Simple Methods"電気学会論文誌A. 121巻・4号(掲載決定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Kumagai and N.Yoshimura: "Tracking and Erosion of HTV Silicone Rubbers Filled with Alumina Trihydrate"IEEE Transactions on DIELECTRICS and Electrical Insulation. Vol.8・No.2(掲載決定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Yoshimura and S.Kumagai: "Electrical and Environmental Aging of Silicone Rubber Used in Outdoor Insulation"IEEE Trans. on Dielectrics and Elect. Insul.. 6・5. 632-650 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] X. Wang, S. Kumagai and N.Yoshimura: "Evaluating Silicone Rubber Materials and Fillers for Outdoor Insulator Housings and Sheds in Accelerating Aging of Environmental Stress"電気学会論文誌A. 119-A・2. 508-515 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S. Kumagai and N.Yoshimura: "Influence of Single and Multiple Environmental Stresses on Tracking and Erosion of RTV Silicone Rubber"IEEE Trans. on Dielectrics and Elect. Insul. 6・2. 211-225 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] X.Wang and N.Yoshimura: "Surface discharge and tracking phenomena induced on acrylonitrile-butadiene-styrene polymer dielectric material by acid rain"J. of Appl. Phys.. 85・10. 7023-7029 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] X.Wang and N.Yoshimura: "Resistance to Tracking and Erosion of Silicone Rubber Material under Various Types of Precipitation"Jpn. J. Appl. Phys.. 38・3A. 5170-5175 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] X.Wang and N.Yoshimura: "Fractal Phenomena Dependence of Hydrophobicity on Surface Appearance and Structual Features of SIR Insulators"IEEE Trans. on Dielectrics and Elect. Insul. 6・6. 781-791 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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