論文 - 早川 直樹
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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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Control and Suppression of Impulse Surface Flashover in Vacuum Based on Discharge Development Mechanisms 査読有り
Y.Nakano, H.Kojima, K.Tsuchiya, N.Hayakawa
IEEE Trans. on Dielectrics and Electrical Insulation 23 巻 ( 1 ) 頁: 35-42 2016年
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平角線モータにおける部分放電開始電圧のばらつき低減方法 査読有り
脇本亨,小島寛樹,早川直樹
電気学会論文誌A 136 巻 ( 3 ) 頁: 121-127 2016年
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真空中沿面フラッシオーバ進展過程における絶縁物上過渡帯電存在時の実効的2次電子放出係数 査読有り
中野裕介,小島寛樹,土屋賢治,早川直樹
電気学会論文誌A 136 巻 ( 3 ) 頁: 128-134 2016年
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Pressure Dependence and Size Effect of LN2 Breakdown Characteristics under Transient Thermal Stress 査読有り
N.Hayakawa, T.Matsuoka, K.Ishida, H.Kojima, S.Isojima, M.Kuwata
IEEE Trans. on Applied Superconductivity 26 巻 ( 3 ) 頁: 7700604 2016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