Papers - HAYAKAWA, Naoki
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Conditioning Mechanism of Cu-Cr Electrode Based on Electrode Surface State under Impulse Voltage Application in Vacuum Reviewed
H.Kojima, N.Hayakawa, R.Nishimura, H.Okubo, H.Sato, H.Saito, Y.Noda
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 18 ( 6 ) page： 2108-2114 2011
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部分放電の時系列測定によるGIS内部の欠陥状態識別 Reviewed
吉田昌展，鈴木啓介，小島寛樹，早川直樹，花井正広，大久保仁
電気学会論文誌B Vol. 131 ( 11 ) page： 905-911 2011
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Partial Discharge Activities under AC/Impulse Superimposed Voltage in LN2/Polypropylene Laminated Paper Insulation System for HTS Cables Reviewed
N.Hayakawa, R.Yamaguchi, U.Ukai, H.Kojima, F.Endo, H.Okubo
Journal of Physics: Conference Series (JPCS) Vol. 234 ( 032020 ) 2010
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Permittivity Characteristics of Epoxy/Alumina Nanocomposite with High Particle Dispersibility by Combining Ultrasonic Wave and Centrifugal Force Reviewed
M.Kurimoto, H.Okubo, K.Kato, M.Hanai, Y.Hoshina, M.Takei, N.Hayakawa
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 17 ( 4 ) page： 1268-1275 2010
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Charge Accumulation Effects on Time Transition of Partial Discharge Activity at GIS Spacer Defects Reviewed
D.A.Mansour, K.Nishizawa, H.Kojima, N.Hayakawa, F.Endo, H.Okubo
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 17 ( 1 ) page： 247-255 2010
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Dielectric Properties of Epoxy/Alumina Nanocomposite Influenced by Agglomerates Control Reviewed
M.Kurimoto, H.Okubo, K.Kato, M.Hanai, Y.Hoshina, M.Takei, N.Hayakawa
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 17 ( 3 ) page： 1268-1275 2010
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Partial Discharge and Associated Mechanisms for Micro Gap Delamination at Epoxy Spacer in GIS Reviewed
D.A.Mansour, K.Nishizawa, H.Kojima, N.Hayakawa, F.Endo, H.Okubo
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 17 ( 3 ) page： 861-867 2010
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Development of 2 MVA Class Superconducting Fault Current Limiting Transformer (SFCLT) with YBCO Coated Conductors Reviewed
M.Kotari, H.Kojima, N.Hayakawa, F.Endo, H.Okubo
Journal of Physics: Conference Series (JPCS) Vol. 234 ( 032070 ) page： - 2010
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Surface Charge Accumulation and Partial Discharge Activity for Small Gaps of Electrode/Epoxy Interface in SF6 Gas Reviewed
D.A.Mansour, H.Kojima, N.Hayakawa, F.Endo, H.Okubo
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 16 ( 4 ) page： 1150-1157 2009
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Dynamic Thermal Characteristics of HTS Coil for Conduction-cooled SMES Reviewed
H.Kojima, X.Chen, N.Hayakawa, F.Endo, H.Okubo
IEEE Trans. on Applied Superconductivity Vol. 19 ( 3 ) page： 2036-2039 2009
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Current Limiting Characteristics of Parallel-Connected YBCO Coated Conductors for High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) Reviewed
K.Omura, H.Kojima, N.Hayakawa, F.Endo, M.Noe, H.Okubo
IEEE Trans. on Applied Superconductivity Vol. 19 ( 3 ) page： 1880-1883 2009
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*Time Variation of Partial Discharge Activity Leading to Breakdown of Magnet Wire under Repetitive Surge Voltage Application Reviewed
N.Hayakawa, H.Inano, Y.Nakamura, H.Okubo
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 15 ( 6 ) page： 1701-1706 2008
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*Partial Discharge Activity in Electrical Insulation for High Temperature Superconducting (HTS) Cables Reviewed
H.Okubo, H.Kojima, F.Endo, K.Sahara, R.Yamaguchi, N.Hayakawa
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 15 ( 3 ) page： 647-654 2008
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*Self-recovery Characteristics of High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) with 2G Coated Conductors Reviewed
H.Kojima, S.Ito, N.Hayakawa, F.Endo, M.Noe, H.Okubo
Journal of Physics: Conference Series page： 12154 2008
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*Quench-induced Partial Discharge Characteristics of HTS Cables Reviewed
N.Hayakawa, S.Ueyama, H.Kojima, F.Endo, Y.Ashibe, T.Masuda, M.Hirose
Journal of Physics: Conference Series page： 12053 2008
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Electrical Insulation Characteristics of HTS Cables under Quench-induced Thermal Stress Condition Reviewed
N.Hayakawa, S.Ueyama, H.Kojima, F.Endo, T.Masuda, M.Hirose
IEEE Trans. on Applied Superconductivity Vol. 17 ( 2 ) page： 1660-1663 2007
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*Breakdown Characteristics of N2O Gas Mixtures for Quasiuniform Electric Field under Lightning Impulse Voltage Reviewed
H.Kojima, O.Kinoshita, N.Hayakawa, F.Endo, H.Okubo, M.Yoshida, T.Ogawa
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 14 ( 6 ) page： 1492-1497 2007
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Technical Development on Partial Discharge Measurement and Electrical Insulation Techniques for Low Voltage Motors Driven by Voltage Inverters Reviewed
H.Okubo, N.Hayakawa, G.C.Montanari
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 14 ( 6 ) page： 1516-1530 2007
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Partial Discharge Inception and Propagation Characteristics of Magnet Wire for Inverter-Fed Motor under Surge Voltage Condition Reviewed
N.Hayakawa, M.Morikawa, H.Okubo
IEEE Trans. on Dielectrics and Electrical Insulation Vol. 14 ( 1 ) page： 39-45 2007
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Thermal Runaway Characteristics of Bi2212 Coil for Conduction-cooled SMES Reviewed
H.Kojima, N.Hayakawa, S.Noguchi, F.Endo, N.Hirano, S.Nagaya, H.Okubo
IEEE Trans. on Applied Superconductivity Vol. 17 ( 2 ) page： 1959-1962 2007