論文 - 早川 直樹
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インバータ駆動機におけるカーボン遊離現象の基礎検討 査読有り
吉武勇一郎，小島啓明， 笠井友樹，丸山正一， 小島寛樹，早川直樹
電気学会論文誌A 140 巻 ( 1 ) 頁： 40-47 2020年1月
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Quench-induced Dynamic Breakdown Characteristics of HTS Pancake Coil Model in Liquid Nitrogen for Resistive SFCL 招待有り 査読有り
N.Hayakawa, M.Mimbu, Y.Mori, H.Kojima, S.Isojima, M.Kuwata
Journal of Physics: Conference Series (JPCS) 1559 巻 頁： 12100 2020年
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Fault Current Limitation Coordination of Multiple SFCLs in IEEE 14-Bus Test System 査読有り
N.Hayakawa, Y.Mori, H.Kojima
Journal of Physics: Conference Series (JPCS) 1559 巻 頁： 12138 2020年
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Resin injection behavior in process of manufacturing insulation spacer with permittivity gradient using computational fluid dynamics
Imai Takahiro, Hoshina Yoshikazu, Kojima Hiroki, Hayakawa Naoki
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 26 巻 ( 5 ) 頁： 1669-1677 2019年10月
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Comparison of permittivity gradient in resin injected and simulated cone-shaped spacers
Imai Takahiro, Takeuchi Miwa, Hoshina Yoshikazu, Kojima Hiroki, Hayakawa Naoki
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 26 巻 ( 5 ) 頁： 1678-1685 2019年10月
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Dynamic Breakdown Characteristics of a Pancake Coil Model for Resistive-Type Superconducting Fault Current Limiters
Hayakawa Naoki, Mimbu Masataka, Kojimao Hiroki, Isojima Shigeki, Kuwata Minoru
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 29 巻 ( 5 ) 2019年8月
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インバータサージ電圧下における巻線の部分放電開始電圧に及ぼす温度および湿度の複合的影響 査読有り
梶武文，浅井洋光，小島寛樹，早川直樹
電気学会論文誌A 139 巻 ( 1 ) 頁： 30-37 2019年1月
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Simulation on Discharge Inception Voltage Improvement of GIS Spacer with Permittivity Graded Materials (epsilon-FGM) Using Flexible Mixture Casting Method
Hayakawa Naoki, Miyaji Yoshitaka, Kojima Hiroki, Kato Katsumi
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 25 巻 ( 4 ) 頁： 1318-1323 2018年8月
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Volume Effect of Dynamic Breakdown Strength in LN2 for Insulation Design of Resistive Superconducting Fault Current Limiters
Hayakawa Naoki, Ishida Kazuki, Mimbu Masataka, Kojima Hiroki, Isojima Shigeki, Kuwata Minoru
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 28 巻 ( 4 ) 2018年6月
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Fault Current Limitation Coordination in Electric Power Grid With Superconducting Fault Current Limiters
Hayakawa Naoki, Maeno Yuya, Kojima Hiroki
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 28 巻 ( 4 ) 2018年6月
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誘電率傾斜機能材料(ε-FGM)を用いたGISスペーサモデルの作製とSF6ガス中絶縁破壊電圧の理論的推定 査読有り
宮路仁崇，小島寛樹， 加藤克巳，早川直樹
電気学会論文誌A 138 巻 ( 4 ) 頁： 155-162 2018年
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Discharge Pattern Discrimination in Vacuum Interrupter with Non-contact Measurement of Shield Potential
Kong Fei, Kojima Hiroki, Hayakawa Naoki, Kimura Toshinori, Tsukima Mitsuru
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 巻 ( 5 ) 頁： 3265-3269 2017年10月
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Optimum Breakdown Charge for Maximum Dielectric Strength in Spark Conditioning in Vacuum under a Non-uniform Electric Field
Kojima H., Takahashi T., Hayakawa N., Hasegawa K., Sakaki M.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 巻 ( 4 ) 頁： 2660-2665 2017年8月
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Electrical Insulation Characteristics and Mechanisms of Low Dielectric Loss Materials for High-Voltage HTS Cables
Hayakawa Naoki, Ishida Kazuki, Matsuoka Tatsuya, Kojima Hiroki
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 27 巻 ( 4 ) 2017年6月
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Breakdown Characteristics and Mechanisms of Liquid Nitrogen Under Transient Thermal Stress for Superconducting Fault Current Limiters
Hayakawa Naoki, Matsuoka Tatsuya, Kojima Hiroki, Isojima Shigeki, Kuwata Minoru
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 27 巻 ( 4 ) 2017年6月
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Calculation Model for Predicting Partial-discharge Inception Voltage in a Non-uniform Air Gap while Considering the Effect of Humidity
Rokunohe Toshiaki, Kato Tatsuro, Kojima Hiroki, Hayakawa Naoki, Okubo Hitoshi
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 巻 ( 2 ) 頁： 1123-1130 2017年4月
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ナノ粒子添加絶縁油の交流電気絶縁破壊電圧の向上メカニズム 査読有り
小島寛樹，近藤貴文，花井正広，早川直樹
電気学会論文誌A 137 巻 ( 2 ) 頁： 101-106 2017年
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Discharge Characteristics of Composite Insulation System with Floating Electrode and Solid Insulator in Vacuum 査読有り
F.Kong, Y.Nakano, H.Kojima, N.Hayakawa, T.Kimura, M.Tsukima
IEEE Trans. on Dielectrics and Electrical Insulation 23 巻 ( 2 ) 頁： 1219-1225 2016年
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Discharge Characteristics for Various Discharge Patterns under Negative Lightning Impulse Voltage in Vacuum 査読有り
F.Kong, Y.Nakano, H.Kojima, N.Hayakawa, T.Kimura, M.Tsukima
IEEE Trans. on Dielectrics and Electrical Insulation 23 巻 ( 2 ) 頁： 813-818 2016年
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Fabrication and Simulation of Permittivity Graded Materials for Electric Field Grading of Gas Insulated Power Apparatus 査読有り
N.Hayakawa, J.Ishiguro, H.Kojima, K.Kato, H.Okubo
IEEE Trans. on Dielectrics and Electrical Insulation 23 巻 ( 1 ) 頁： 547-554 2016年