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J-GLOBAL ID：202301020894501358   Update date: Oct. 01, 2024

Urai Hajime

ウライ ハジメ | Urai Hajime
Affiliation and department：
Toyo University Department of Electrical, Electronic and Communications Engineering

About Toyo University Department of Electrical, Electronic and Communications Engineering


Job title： Professor
Research field  (2)： Electrical power engineering ,  Applied plasma science
Research theme for competitive and other funds  (3)：
  • 2024 - 2028 DC interruption method with switching function of wide-gap semiconductor
  • 2022 - 2025 Atmospheric Pressure Plasma Treatment to Control Surface Properties of Resin Materials for Medical Devices
  • 2022 - 2025 大気圧温度制御プラズマ処理による樹脂製高電圧絶縁材料の特性改善に関する研究
Papers (72)：
  • Toshiaki Sakuyama, Hiroyuki Kobayashi, Masanori Ishikawa, Hideyuki Kotsuji, Katsuhiko Shiraishi, Hajime Urai, Yasunori Tanaka. Comparison of measurement and numerical calculation on spectral profile of ablation arc plasma around current zero in high-voltage gas circuit breakers. Journal of Physics D: Applied Physics. 2023. 56. 40. 405503-405503
  • Hideyuki Kotsuji, Masanao Terada, Katsuhiko Shiraishi, Hajime Urai, Yasunobu Yokomizu. Experimental Analysis of Degradation in Insulation Performance After Arc-Preconditioning in High-Voltage Circuit Breaker. IEEE Transactions on Dielectrics and Electrical Insulation. 2023. 30. 1. 393-402
  • Hideyuki Kotsuji, Mami Kuroda, Masanao Terada, Katsuhiko Shiraishi, Hajime Urai, Yasunobu Yokomizu. Investigation of Discharge Propagation in Localized High-Temperature SF6 Gas With Breakdown Voltage Measurement. IEEE Transactions on Plasma Science. 2023. 51. 2. 429-436
  • Yasunobu Yokomizu, Naoto Kodama, Hajime Urai, Masanao Terada, Mami Kuroda. Reaction Products in SF6 Multi Mixture with C2F4-BN and Cu Vapor Decomposition at 300-3000 K: Approach to Dielectric Breakdown Property Evaluation. 13th International Workshop on High Voltage Engineering. 2022
  • Masanao Terada, Hajime Urai, Masanori Ishikawa, Katsuhiko Shiraishi, Toshiaki Sakuyama, Hideyuki Kotsuji, Mami Kuroda, Tatsuya Ishii, Yasunobu Yokomizu. Method of Evaluating Dielectric Interruption Capability of High-Voltage Circuit Breaker. IEEE Transactions on Power Delivery. 2022. 37. 5. 3885-3892
ｍore...
MISC (13)：
  • Hajime URAI, Mikimasa IWATA. Arc Plasma Analysis Technology to Accelerate the Development of Advanced Electric Power Equipment. The Journal of The Institute of Electrical Engineers of Japan. 2024. 144. 8. 502-503
  • Hajime URAI, Zhizhi LIU, Taiki OSAWA, Akitoshi OKINO, Hiroki KOJIMA. Atmospheric Plasma Jet for Electrical-insulation Resin Surface Treatment. 2024. 46
  • Hajime Urai. Development trends on the SF6-free technology for switching equipment for the electric power system. Bulletin of Daido University. 2023. 58. 1-12
  • Hajime Urai. Simulations for Current Interruption in High-Voltage Gas Circuit Breakers. IEEJ Transactions on Power and Energy. 2022. 142. 5. 239-242
  • Hajime Urai, Takanori Iijima, Kunihiko Tomiyasu, Takashi Inagaki, Gaku Asanuma. Development Trend of High-voltage Switching Technology for the Sustainable Society. IEEJ Transactions on Power and Energy. 2021. 141. 11. 650-655
ｍore...
Patents (47)：
  • POWER CONVERSION SYSTEM
  • POWER CONVERSION SYSTEM
  • 電力変換システム
  • Gas circuit breaker
  • Gas circuit breaker
ｍore...
Books (7)：
  • IEEJ Technical Report No. 1474 "Backgrounds and Reasons for Revision of JEC-2300 Alternating-current Circuit-breaker Standard"
    The Institute of Electrical Engineers of Japan 2020
  • IEEJ Technical Report No. 1376 "Switching Phenomena and Requirements for High Voltage Circuit Breakers on Power Systems"
    The Institute of Electrical Engineers of Japan 2016
  • IEEJ Technical Report No. 1312 "State of the Art of Worldwide Performance Investigation Technologies for Circuit Breakers"
    The Institute of Electrical Engineers of Japan 2014
  • IEEJ Technical Report No. 1200 "Guide for Application of JEC-2300"
    The Institute of Electrical Engineers of Japan 2010
  • IEEJ Technical Report No. 1116 "The Reliability of High Voltage Circuit Breaker and its Improvement Technology"
    The Institute of Electrical Engineers of Japan 2008
ｍore...
Lectures and oral presentations  (80)：
  • Fundamental research on low-voltage DC interrupting method by high-speed current commutation using switching function of SiC-MOSFET -capacitance 1-100 μF-.
    (Tokai-Section Join;Conference on Electrical;Electronics, Information;Related Engineering 2024)
  • 生体材料を均一処理するためのリニア型マルチガスプラズマ源の開発
    (令和5年度生体医歯工学共同研究拠点成果報告会 2024)
  • 樹脂表面改質のための大気圧プラズマジェットの電気的特性計測
    (令和5年度生体医歯工学共同研究拠点成果報告会 2024)
  • Development of atmospheric linear type plasma for fabrication of photonic biosensor
    (8th International Symposium on Biomedical Engineering (ISBE2023))
  • The recent development of arc plasma simulatioins and their prospects
    (The 2023 Annual Meeting of I.E.E. Japan Symposium 2023)
ｍore...
Education (3)：
  • 1994 - 1997 Tokyo Institute of Technology Graduate School of Science and Engineering Department of Electrical and Electronic Engineering
  • 1992 - 1994 Tokyo Institute of Technology Graduate School of Science and Engineering Department of Electrical and Electronic Engineering
  • 1988 - 1992 Tokyo Institute of Technology School of Engineering
Professional career (1)：
  • Ph.D. (Engineering) (Tokyo Institute of Technology)
Work history (4)：
  • 2023/04 - 現在 Toyo University Faculty of Science and Engineering, Department of Electrical Electronic and Computer Engineering Professor
  • 2021/04 - 2023/03 Daido University School of Engineering Department of Electrical and Electronic Engineering Professor
  • 1997/04 - 2021/03 Hitachi, Ltd.,
  • 2008/08 - 2011/03 Tokyo Institute of Technology Global COE program Co-advisor
Committee career (24)：
  • 2024/09 - 現在 8th International Conference on Electric Power Equipment - Switching Technology, Local Organizing Committee Vice chairperson
  • 2024/09 - 現在 CIGRE Janapese Technical Commitee SC A3 Member
  • 2023/06 - 現在 IEE of Japan Technical Committee on Smart Facilities, Primary member
  • 2023/04 - 現在 Technical Committee of ATEEE-2024, The 2024 2nd International Conference of Advanced Technology of Electrical Engineering and Energy Member
  • 2022/10 - 現在 IEE of Japan Study Committee "Application of Sensing Technology to High Voltage Circuit Breakers and its Applications", Member
Show all
Awards (1)：
  • 2024/09 - 電気学会 電気学会電力・エネルギー部門論文査読貢献賞
Association Membership(s) (3)：
CIGRE ,  IEEE ,  The Institute of Electrical Engineers of Japan
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