論文 - 早川 直樹
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Improvement of AC Conditioning Effect in Vacuum by High Frequency Voltage 査読有り
R.Konagi, H.Kojima, S.Iitsuka, M.Kobayashi, N.Hayakawa
IEEJ Transactions on Electrical and Electronic Engineering 19 巻 ( 11 ) 頁： 1781 - 1787 2024年
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Enhancing Electrical Insulation Performance of Insulating Spacers using Functionally Graded Materials in Natural-Origin Gas GIS 査読有り
K.Okamoto, N.Hayakawa, K.Kato, N.Osawa, M.Kozako, H.Okubo
CIGRE Paris Session 11054 巻 2024年
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Partial Discharge Progress and Breakdown Characteristics of Oil-impregnated Paper Insulation System for Capacitor Voltage Transformers 査読有り
Y.Nagaki, R.Hayashi, H.Kojima, M.Yoshida, N.Hayakawa
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2024年
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Effective High Frequency AC Conditioning in Vacuum 査読有り
R.Konagi, H.Kojima, S.Iitsuka, M.Kobayashi, N.Hayakawa
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2024年
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コンデンサ形計器用変圧器の期待寿命評価方法および部分放電進展特性 査読有り
永木雄也，林恭平，小島寛樹，吉田昌展，大谷彰，早川直樹
電気学会論文誌B 2023年
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Breakdown Charge Dependence of Counter Electrode Material Adhesion and Dielectric Strength after Spark Conditioning in Vacuum 査読有り
N.Kita, H.Kojima, N.Hayakawa, H.Fukuda, K.Yamamura
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2023年
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Volume Effect of Dynamic Breakdown Strength in Liquid Nitrogen under Transient Bubble Disturbance for Resistive Superconducting Fault Current Limiters 査読有り
N.Hayakawa, Y.Mori, H.Kojima
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 29 巻 ( 1 ) 頁： 264 - 269 2022年
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Development of Sophisticated Cone-Type Insulating Spacer for 245 kV Class GIS by Functional Insulating Materials 査読有り
K.Okamoto, N.Hayakawa, M.Hikita, H.Okubo, K.Kato, N.Osawa
CIGRE Paris Session 10648 巻 2022年
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Electric Field Grading and Discharge Inception Voltage Improvement on HVDC GIS/GIL Spacer with Permittivity and Conductivity Graded Materials (ε/σ-FGM) 査読有り
Rachmawati, H.Kojima, K.Kato, N.Zebouchi, N.Hayakawa
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 29 巻 ( 5 ) 頁： 1811 - 1817 2022年
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Melting and Generation of Micro-protrusions on Cathode Surface during Spark Conditioning Process in Vacuum 査読有り
N.Kita, F.Kondo, H.Kojima, N.Hayakawa, H.Fukuda, K.Yamamura
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 29 巻 ( 3 ) 頁： 1160 - 1166 2022年
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Breakdown Characteristics of Cone-type ε-FGM Spacer for Gas Insulated Switchgears 査読有り
Y.Miyazaki, H.Kojima, H.Masui, H.Mitsudome, H.Yanase, K.Okamoto, K.Watanabe, K.Kato, N.Hayakawa
141 巻 ( 10 ) 2021年10月
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Development of Insulation System to Prevent Local Carbonization inside Stator Core of a Product Inverter-fed Motor 査読有り
141 巻 ( 4 ) 頁： 260-268 2021年4月
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DC Electric Field Distribution under Gas-Conductivity-Dominant Condition in Gas-Solid Composite Insulation Systems 査読有り
141 巻 ( 2 ) 頁： 156-163 2021年2月
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Dielectric characteristics of liquid nitrogen / synthetic paper composite insulation system for extra high voltage HTS cable 査読有り
N.Hayakawa, K.Yamakami, T.Masuda, H.Kojima
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 巻 ( 5 ) 2021年
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Time and Space Transition of DC Electric Field Distribution Based on Emerging Field by Accumulated Charge in Gas-solid Composite Insulation Structure 査読有り
R.Nakane, N.Hayakawa, H.Okubo
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2021年
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Time Transition of Activated Conductivity Distribution in Air and Charge Accumulation in Air-solid Composite Insulation Systems under DC Partial Discharge 査読有り
R.Nakane, H.Kojima, N.Hayakawa
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2021年
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Electric Field Simulation of Permittivity and Conductivity Graded Materials (e/s-FGM) for HVDC GIS Spacers 査読有り 国際共著
Rachmawati, H.Kojima, N.Hayakawa, K.Kato, N.Zebouchi
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 2021年
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Alternative Test Method of Internal Arcing for Replacing SF6 by Air in SF6 Insulated Power Equipment 査読有り
M.Kotari, M.Iwata, H.Kojima, N.Hayakawa
Engineering Research Express 3 巻 ( 035005 ) 2021年
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Partial Discharge Inception Voltage under Inverter Surge Voltage Considering Interactive Effects of Environmental Factors 査読有り
140 巻 ( 7 ) 頁： 349-356 2020年7月
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絶縁油-プレスボード複合絶縁構成における直流電界ストレスの時間・空間推移特性 査読有り
中根龍一，加藤克巳， 早川直樹，大久保仁
電気学会論文誌A 140 巻 ( 2 ) 頁： 56-63 2020年2月