Papers - HAYAKAWA, Naoki
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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 Reviewed
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 Vol. 140 ( 1 ) page： 40-47 2020.1
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Quench-induced Dynamic Breakdown Characteristics of HTS Pancake Coil Model in Liquid Nitrogen for Resistive SFCL Invited Reviewed
N.Hayakawa, M.Mimbu, Y.Mori, H.Kojima, S.Isojima, M.Kuwata
Journal of Physics: Conference Series (JPCS) Vol. 1559 page： 12100 2020
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Fault Current Limitation Coordination of Multiple SFCLs in IEEE 14-Bus Test System Reviewed
N.Hayakawa, Y.Mori, H.Kojima
Journal of Physics: Conference Series (JPCS) Vol. 1559 page： 12138 2020
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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 Vol. 26 ( 5 ) page： 1669-1677 2019.10
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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 Vol. 26 ( 5 ) page： 1678-1685 2019.10
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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 Vol. 29 ( 5 ) 2019.8
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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 Reviewed
梶武文，浅井洋光，小島寛樹，早川直樹
電気学会論文誌A Vol. 139 ( 1 ) page： 30-37 2019.1
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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 Vol. 25 ( 4 ) page： 1318-1323 2018.8
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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 Vol. 28 ( 4 ) 2018.6
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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 Vol. 28 ( 4 ) 2018.6
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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 Reviewed
宮路仁崇，小島寛樹， 加藤克巳，早川直樹
電気学会論文誌A Vol. 138 ( 4 ) page： 155-162 2018
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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 Vol. 24 ( 5 ) page： 3265-3269 2017.10
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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 Vol. 24 ( 4 ) page： 2660-2665 2017.8
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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 Vol. 27 ( 4 ) 2017.6
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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 Vol. 27 ( 4 ) 2017.6
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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 Vol. 24 ( 2 ) page： 1123-1130 2017.4
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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 Reviewed
小島寛樹，近藤貴文，花井正広，早川直樹
電気学会論文誌A Vol. 137 ( 2 ) page： 101-106 2017
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Discharge Characteristics of Composite Insulation System with Floating Electrode and Solid Insulator in Vacuum Reviewed
F.Kong, Y.Nakano, H.Kojima, N.Hayakawa, T.Kimura, M.Tsukima
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 23 ( 2 ) page： 1219-1225 2016
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Discharge Characteristics for Various Discharge Patterns under Negative Lightning Impulse Voltage in Vacuum Reviewed
F.Kong, Y.Nakano, H.Kojima, N.Hayakawa, T.Kimura, M.Tsukima
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 23 ( 2 ) page： 813-818 2016
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Fabrication and Simulation of Permittivity Graded Materials for Electric Field Grading of Gas Insulated Power Apparatus Reviewed
N.Hayakawa, J.Ishiguro, H.Kojima, K.Kato, H.Okubo
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 23 ( 1 ) page： 547-554 2016