Faculty Profiles - KOJIMA Hiroki

Presentations -

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Optimization Design of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT) International coauthorship International conference

C. Kurupakorn, H. Kojima, N. Hayakawa, N. Kashima, S. Nagaya, M. Noe, K. P. Juengst, H. Okubo

7th European Conference on Applied Superconductivity

Dielectric-coating Effect in CO₂ and SF₆ Gases under Impulse Voltage Application International conference

N. Hayakawa, N. Koshino, O. Kinoshita, H. Kojima, F. Endo, M. Yoshida, T. Ueda, H. Okubo

14th International Symposium on High Voltage Engineering

Dielectric Characteristics of N₂O Gas and N₂O/CO₂ Gas Mixtures as SF₆ Substitutes International conference

O. Kinoshita, N. Koshino, H. Kojima, N. Hayakawa, F. Endo, M. Yoshida, T. Ueda, H. Okubo

14th International Symposium on High Voltage Engineering

N₂OおよびN₂O/CO₂混合ガスの不平等電界下における部分放電・絶縁破壊特性

木下修，越野尚人，小島寛樹，早川直樹，植田俊明，吉田昌展，大久保仁

平成17年電気学会電力・エネルギー部門大会

過冷却液体窒素中におけるBi2212/CuNi複合バルクコイルの限流特性

チャチャヴァンクルパコン，小島寛樹，早川直樹，鹿島直二，長屋重夫，大久保仁

平成17年電気学会電力・エネルギー部門大会

冷凍機伝導冷却HTSコイルにおける通電特性および熱的特性

野口真希，チャチャヴァンクルパコン，小島寛樹，早川直樹，平野直樹，長屋重夫，大久保仁

平成17年電気学会電力・エネルギー部門大会

高温超電導ケーブルの積層テープ絶縁構成における部分放電開始・進展特性

梛野晶樹，佐原賢吾，小島寛樹，早川直樹，大久保仁

平成17年電気学会電力・エネルギー部門大会

Technical Feasibility of Superconducting Fault Current Limiting Transformer in Future Electric Power Network

H. Kojima, C. Kurupakorn, N. Hayakawa, M. Goto, N. Kashima, S. Nagaya, H. Okubo

International Symposium on EcoTopia Science 2005

Impulse and AC PD Inception Characteristics of LN₂/Polypropylene Laminated Paper Composite Insulation System International conference

H. Okubo, M. Nagino, H. Kojima, N. Hayakawa, T. Takahashi, K. Yasuda

2005 IEEE International Conference on Dielectric Liquids 2005.6 Laboratório de Instrumentação e Física Experimental de Partículas

Event date： 2005.6 - 2005.7

Language：English Presentation type：Oral presentation (general)

Venue：Coimbra Country：Portugal

We discussed partial discharge (PD) inception characteristics of liquid nitrogen (LN2) / polypropylene (PP) laminated paper composite insulation system for high temperature superconducting (HTS) cables. In this paper, we measured PD inception characteristics under lightning impulse voltage application by both electrical and optical methods. The impulse PD inception characteristics were compared with those under ac voltage application, and the PD generation mechanisms were discussed. Experimental results revealed that PD detection sensitivity under lightning impulse voltage application reached as small as 6 pC. PD was verified to be generated not only inside the butt gap but also outside the butt gap under both lightning impulse and ac voltage applications. AE sensors could also be applied to PD measurement under ac voltage application. © 2005 IEEE.

DOI： 10.1109/ICDL.2005.1490117

Scopus

Other Link： https://www.webofscience.com/wos/woscc/full-record/WOS:000232829800103

Simulation of Current Limiting and Recovery Characteristics of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT)

C. Kurupakorn, H. Kojima, N. Hayakawa, F. Endo, N. Kashima, S. Nagaya, H. Okubo

2005.6.16

Partial Discharge Measurement by Acoustic Method in Laminated Paper Insulation System for HTS Cables

K. Sahara, M. Nagino, H. Kojima, N. Hayakawa, F. Endo, T. Takahashi, K. Yasuda, H. Okubo

2005.6.16

Electrical and Thermal Characteristics of Bi2212/Ag HTS Coil for Conduction-cooled SMES

S. Noguchi, C. Kurupakorn, H. Kojima, N. Hayakawa, F. Endo, N. Hirano, S. Nagaya, H. Okubo

2005.6.16

CO₂ガス中絶縁コーティング電極系における絶縁破壊電界の実効電界空間依存性

越野尚人，木下修，小島寛樹，早川直樹，植田俊明，大久保仁

平成17年電気学会全国大会

高温超電導ケーブル用液体窒素／積層テープ複合絶縁系におけるAEセンサを用いた部分放電測定

梛野晶樹，佐原賢吾，小島寛樹，早川直樹，後藤益雄，高橋俊裕，安田健次，大久保仁

平成17年電気学会全国大会

N₂OガスおよびN₂O/CO₂混合ガスの準平等電界下における絶縁破壊特性

木下修，越野尚人，小島寛樹，早川直樹，植田俊明，大久保仁

平成17年電気学会全国大会

Bi2212/CuNi複合バルクコイルの直並列接続時における抵抗発生特性

クルパコンチャチャヴァン，小島寛樹，早川直樹，後藤益雄，鹿島直二，長屋重夫，大久保仁

平成17年電気学会全国大会

SMES用伝導冷却Bi2212/Agコイルにおける臨界電流の温度依存性

野口真希，Chatchaval Kurupakorn，小島寛樹，早川直樹，後藤益雄，平野直樹，長屋重夫，大久保仁

平成17年電気学会全国大会

Temperature Dependence of Critical Current at 4.2K-55K of Conduction-cooled Bi2212/Ag Wires for SMES International conference

H. Kojima, S. Noguchi, C. Kurupakorn, N. Hayakawa, M. Goto, N. Hirano, S. Nagaya, H. Okubo

Applied Superconductivity Conference

Dielectric Characteristics and Electrical Insulation Design of HTS Cables International conference

N. Hayakawa, M. Nagino, H. Kojima, M. Goto, T. Takahashi, K. Yasuda, H. Okubo

Applied Superconductivity Conference

Recovery Characteristics after Current Limitation of High Temperature Superconducting Fault Current Limiting Transformer (HTc-SFCLT) International coauthorship International conference

C. Kurupakorn, H. Kojima, N. Hayakawa, N. Kashima, S. Nagaya, M. Noe, K.-P. Juengst, H. Okubo

Applied Superconductivity Conference

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