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Multiscale modeling of degradation of electrical insulating material

Research Project

Project/Area Number 20H02140
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 21010:Power engineering-related
Research InstitutionOsaka Research Institute of Industrial Science and Technology

Principal Investigator

Iwata Shinya  地方独立行政法人大阪産業技術研究所, 和泉センター, 主任研究員 (10642382)

Co-Investigator(Kenkyū-buntansha) 木谷 亮太  地方独立行政法人大阪産業技術研究所, 和泉センター, 研究員 (90761619)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2020: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Keywords絶縁劣化 / 電気トリー / 量子化学計算 / 分子動力学計算 / 有限要素解析 / エネルギー解放率 / 部分放電 / 深層学習 / 絶縁破壊 / 水トリー / 空間電荷 / 電流積分電荷法
Outline of Research at the Start

電気絶縁材料は電力インフラを支える重要な要素であるが、その劣化プロセスは未解明な点が多い。本研究では、絶縁材料への電荷蓄積から破壊(電気トリーや水トリー)の進展に至るまでを研究対象とし、幅広い空間スケールで絶縁劣化現象の物理化学的背景を明らかにする。絶縁材料内部への電荷の蓄積や移動現象に着目し、空間電荷の解析、量子化学計算、分子動力学計算などを通して、劣化プロセスの初期過程における電荷と分子間・分子内結合の役割を究明する。また、高輝度放射光を利用したX線コンピュータ断層撮影と計算機シミュレーションによる劣化形態の観察、解析および分光学的評価手法などにより、破壊の進展プロセスを解明する。

Outline of Final Research Achievements

This study focused on polymer electrical insulating materials, aiming to elucidate the phenomena of degradation, electrical breakdown, and their suppression, and to develop simulation methods. The following results were obtained: (1) The force required to rapture atomic bonds was evaluated using quantum chemical calculations, and the reduction in bond strength due to oxidation was verified. (2) The dynamic properties of polyethylene cross-linking agent decomposition residues and water were assessed using molecular dynamics simulations, and the proposed model was validated. (3) A method for calculating the energy release rate of electrical tree using finite element analysis was established. (4) We achieved successful classification of phase-resolved partial discharge signals using machine learning and deep learning. (5) A model for charge transfer was constructed using the Q(t) method. The results were primarily disseminated through academic journals.

Academic Significance and Societal Importance of the Research Achievements

電気絶縁材料は、電力インフラを支える重要な要素のひとつであり、その劣化や破壊の原理解明は、電力の安定供給の観点から不可欠である。本研究は、計算機シミュレーションを積極的に利用し、絶縁劣化の要因や原理を異なるサイズスケールで評価、検証した点において学術的意義がある。また、電気トリー進展の解析においては、有限要素解析によるエネルギー解放率を導出した。これは電気的破壊と機械的破壊の境界領域を扱い、新規性・独自性が大きい。さらに、電力設備の安定的な運用や高経年化への対策においては、部分放電や微小電流の計測と解析が肝要である。本研究は、その解析精度向上に資する基礎的成果を得ており、社会的意義も大きい。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (23 results)

All 2023 2022 2021 2020

All Journal Article (12 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 10 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Verification of Interpretability of Phase-Resolved Partial Discharge Using a CNN With SHAP2023

    • Author(s)
      Kitani Ryota、Iwata Shinya
    • Journal Title

      IEEE Access

      Volume: 11 Pages: 4752-4762

    • DOI

      10.1109/access.2023.3236315

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Brute-force analysis of insight of phase-resolved partial discharge using a CNN2023

    • Author(s)
      Kitani Ryota、Iwata Shinya
    • Journal Title

      Electrical Engineering

      Volume: - Issue: 4 Pages: 2373-2382

    • DOI

      10.1007/s00202-023-01808-4

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influence of an external electric field on the rupture force of decane, 4-decanone, and dicumyl peroxide molecules: Computational insight2022

    • Author(s)
      Iwata Shinya、Uehara Hiroaki、Okamoto Tatsuki、Takada Tatsuo
    • Journal Title

      Materials Today Communications

      Volume: 32 Pages: 103928-103928

    • DOI

      10.1016/j.mtcomm.2022.103928

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electric Field and Temperature Characteristics of Accumulated Charge Amount in Several Polymeric Insulating Materials Using Q(t) Method and Quantum Chemical Calculation2022

    • Author(s)
      Uehara H.、Okamoto T.、Sekii Y.、Iwata S.、Takada T.
    • Journal Title

      Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP

      Volume: 2022-November Pages: 13-16

    • DOI

      10.1109/ceidp55452.2022.9985349

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Energy-Release Rate in Electrically Deteriorated Materials Introduced by Using Maxwell Stress Tensor at Crack Tip2021

    • Author(s)
      Kitani Ryota、Iwata Shinya、Imatani Shoji
    • Journal Title

      IEEE Transactions on Dielectrics and Electrical Insulation

      Volume: 28 Issue: 6 Pages: 1925-1932

    • DOI

      10.1109/tdei.2021.009692

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influence of external electric fields and temperature on the behavior of water and acetophenone molecules in C120H242 chains: A molecular dynamics study2021

    • Author(s)
      Iwata Shinya、Uehara Hiroaki、Okamoto Tatsuki、Sekii Yasuo、Takada Tatsuo
    • Journal Title

      Materials Today Communications

      Volume: 28 Pages: 102514-102514

    • DOI

      10.1016/j.mtcomm.2021.102514

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Phase-resolved partial discharge analysis of different types of electrode systems using machine learning classification2021

    • Author(s)
      Iwata Shinya、Kitani Ryota
    • Journal Title

      Electrical Engineering

      Volume: 103 Issue: 6 Pages: 3189-3199

    • DOI

      10.1007/s00202-021-01306-5

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Analysis of Charge Trap Depth Using Q(t) Method and Quantum Chemical Calculation in XLPE and PE with Phenolic Antioxidant2021

    • Author(s)
      Uehara H.、Okamoto T.、Sekii Y.、Iwata S.、Takada T.
    • Journal Title

      2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena

      Volume: - Pages: 518-521

    • DOI

      10.1109/ceidp50766.2021.9705439

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Q(t)測定によるXLPEでの電荷蓄積の計測時間依存性の評価2021

    • Author(s)
      高田達雄, 橘川昴平, 植原弘明, 岩田晋弥
    • Journal Title

      電気学会 誘電・絶縁材料/電線・ケーブル合同研究会資料

      Volume: DEI-21-051 Pages: 7-12

    • Related Report
      2020 Annual Research Report
  • [Journal Article] 高分子材料の絶縁劣化と劣化抑制メカニズムの検討2021

    • Author(s)
      岩田晋弥, 植原弘明, 岡本達希, 関井康雄, 高田達雄
    • Journal Title

      令和3年電気学会全国大会シンポジウム講演論文

      Volume: S4 Pages: 21-24

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Energy Level Gradient Under Electric Field Revealed by Molecular Dynamics Simulation of Polyethylene and Antioxidant2020

    • Author(s)
      H. Uehara, T. Okamoto, S. Iwata, Y. Sekii, T. Takada, Y. Cao
    • Journal Title

      2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena

      Volume: - Pages: 189-192

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Q(t)-measurements of electrically deteriorated polymeric materials under environmental testing2020

    • Author(s)
      R. Kitani, S. Iwata
    • Journal Title

      2020 International Symposium on Electrical Insulating Materials

      Volume: - Pages: 169-172

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] エネルギー解放率に基づく電気絶縁材料劣化現象の駆動力推定2022

    • Author(s)
      木谷亮太, 岩田晋弥, 今谷勝次
    • Organizer
      第334回電気材料技術懇談会
    • Related Report
      2022 Annual Research Report
  • [Presentation] エポキシ樹脂を中心とした機器用絶縁における量子化学計算の活用2022

    • Author(s)
      岩田晋弥, 今井隆浩, 植原弘明
    • Organizer
      電気学会令和4年 基礎・材料・共通部門大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 計算機シミュレーションを活用した絶縁劣化およびその抑制原理の検討2022

    • Author(s)
      岩田晋弥
    • Organizer
      電気学会四国支部講演会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Electric Field and Temperature Characteristics of Accumulated Charge Amount in Several Polymeric Insulating Materials Using Q(t) Method and Quantum Chemical Calculation2022

    • Author(s)
      H. Uehara, T. Okamoto, S. Iwata, Y. Sekii, T. Takada
    • Organizer
      2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena
    • Related Report
      2022 Annual Research Report
  • [Presentation] Analysis of Charge Trap Depth Using Q(t) Method and Quantum Chemical Calculation in XLPE and PE with Phenolic Antioxidant2021

    • Author(s)
      H. Uehara, T. Okamoto, S. Iwata, Y. Sekii, T. Takada
    • Organizer
      2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] アセトフェノンおよび水が高分子絶縁劣化に与える影響~分子動力学計算による評価~2021

    • Author(s)
      岩田晋弥, 植原弘明, 岡本達希, 関井康雄, 高田達雄
    • Organizer
      令和3年電気関係学会関西連合大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高分子材料の絶縁劣化と劣化抑制メカニズムの検討2021

    • Author(s)
      岩田晋弥, 植原弘明, 岡本達希, 関井康雄, 高田達雄
    • Organizer
      令和3年電気学会全国大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Q(t)測定によるXLPEでの電荷蓄積の計測時間依存性の評価2021

    • Author(s)
      高田達雄, 岩田晋弥, 橘川昴平, 植原弘明
    • Organizer
      電気学会 誘電・絶縁材料/電線・ケーブル合同研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Energy Level Gradient Under Electric Field Revealed by Molecular Dynamics Simulation of Polyethylene and Antioxidant2020

    • Author(s)
      H. Uehara, T. Okamoto, S. Iwata, Y. Sekii, T. Takada, Y. Cao
    • Organizer
      2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Q (t)-measurements of electrically deteriorated polymeric materials under environmental testing2020

    • Author(s)
      R. Kitani, S. Iwata
    • Organizer
      2020 International Symposium on Electrical Insulating Materials (ISEIM)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高分子材料の絶縁劣化抑制原理の解明~分子動力学計算による界面活性剤の機能検証~2020

    • Author(s)
      岩田晋弥, 植原弘明, 関井康雄, 高田達雄
    • Organizer
      令和2年電気関係学会関西連合大会
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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