Faculty Profiles - KOJIMA Hiroki

Presentations -

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超純水の短ギャップ交流絶縁破壊特性

佐藤広治，小島寛樹，花井正広，加藤克巳，早川直樹

平成26年電気学会全国大会

液体窒素/ポーラス絶縁紙複合絶縁系の電気絶縁特性

西町誠一郎，松岡達矢，栗本宗明，小島寛樹，花井正広，早川直樹

平成26年電気学会全国大会

真空中不平等電界下におけるコンディショニング進展の昇圧方法依存性

大竹泰智，高橋達也，小島寛樹，長谷川光佑，斉藤仁，榊正幸，早川直樹

平成26年電気学会全国大会

真空中交流部分放電における熱処理アルミナ上の帯電形成・進展特性

仲田祐希，小島寛樹，花井正広，浅利直紀，塩入哲，松尾和宏，早川直樹

平成26年電気学会全国大会

真空中の浮遊電極を介する絶縁破壊過程に関する実験的考察

孔飛，中野裕介，小島寛樹，木村俊則，月間満，早川直樹

平成26年電気学会全国大会

セラミックスの大気中熱処理が真空中のセラミックス表面の発光開始電圧に与える影響

浅利直紀，塩入哲，佐藤純一，松尾和宏，小島寛樹，花井正広，早川直樹

平成26年電気学会全国大会

真空中沿面フラッシオーバ進展過程における過渡帯電電荷量と放電進展条件

中野裕介，小島寛樹，土屋賢治，早川直樹

平成26年電気学会全国大会

液体窒素の絶縁破壊電界におけるサイズ効果の圧力・温度依存性

西町誠一郎，小島寛樹，花井正広，早川直樹

電気学会放電/誘電・絶縁材料/高電圧合同研究会 2014.1.23 電気学会電/誘電・絶縁材料/高電圧技術委員会

Inception Mechanism of Surface Flashover on Solid Insulator in Vacuum International conference

Y .Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

International Symposium on EcoTopia Science 2013

Intelligent Grid Management System (IGMS) with Optimum Power Flow and Degradation Control of Power Apparatus International conference

K. Fukaya, K. Shinoda, H. Kojima, M. Hanai, H. Okubo, N. Hayakawa

International Symposium on EcoTopia Science 2013

Electrical Insulation Characteristics of Insulating Oil with Dispersed TiO₂ and ZnO Nanoparticles International conference

K. Sato, S. Hosomi, M. Hanai, H. Kojima, N. Hayakawa, H. Okubo

International Symposium on EcoTopia Science 2013

Spark Conditioning Effect on Multi-gap Electrode System in Vacuum International conference

Y. Otake, H. Kojima, N. Hayakawa, K. Hasegawa, H. Saito, M. Sakaki, H. Okubo

International Symposium on EcoTopia Science 2013

Initiation and Propagation Mechanism of Leader-type Breakdown in Air International conference

T. Kitamura, K. Hotta, H. Kojima, N. Hayakawa, K. Kobayashi, T. Kato, T. Rokunohe, H. Okubo

International Symposium on EcoTopia Science 2013

Electric Field Control for Gas Insulated Switchgear with Functionally Graded Materials (FGM) on Surface Conductivity International conference

J. Ishiguro, H. Kojima, M. Hanai, K. Kato, H. Okubo, N. Hayakawa

International Symposium on EcoTopia Science 2013

Influence of Needle Electrode Material and Shape on Electromagnetic Wave Radiation Characteristics of Partial Discharge in SF₆ Gas International conference

R. Mizuno, M. Hanai, H. Kojima, N. Hayakawa, M. Yoshida, H. Okubo

International Symposium on EcoTopia Science 2013

Current Limiting Characteristics of Superconducting Fault Current Limiting Cable (SFCLC) with Longitudinal Temperature Distribution International conference

T. Osawa, H. Kojima, M. Hanai, N. Hayakawa, H. Okubo

International Symposium on EcoTopia Science 2013

Partial Discharge Inception Characteristics of Rectangular Wires for Inverter-fed Motors International conference

T. Wakimoto, H. Kojima, M. Hanai, N. Hayakawa

International Symposium on EcoTopia Science 2013

真空中における突発的電子放出に起因する沿面フラッシオーバメカニズム

中野裕介，小島寛樹，土屋賢治，早川直樹

電気学会放電/開閉保護/高電圧合同研究会 2013.11.20 電気学会放電/開閉保護/高電圧技術委員会

Conditioning Process of Multi-gap Electrode System with Cu-Cr Rod Electrode in Vacuum International conference

Y. Otake, H. Kojima, N. Hayakawa, K. Hasegawa, H. Saito, M. Sakaki, H. Okubo

2nd International Conference on Electric Power Equipment - Switching Technology 2013.10.22 Nagoya University

Event date： 2013.10

Language：English Presentation type：Oral presentation (general)

Venue：Matsue Country：Japan

In order to clarify the characteristics of spark conditioning carried out in parallel at several parts of electrodes, we studied conditioning process in a multi-gap electrode system with two rod-plane electrodes in vacuum. The rod material and gap distance of one gap was kept to Cu-Cr (d=5 mm) in some multi-gap electrodes. On the other hand, the rod material and gap distance of the other gap were varied. As a result, the number of breakdowns till conditioning saturation of Cu-Cr rod in the multi-gap electrode system was less than that in the single-gap electrode system. These results suggest that charge activity occurs between electrodes even at the gap without breakdown, which can also contribute to the conditioning effect. © 2013 IEEE.

DOI： 10.1109/ICEPE-ST.2013.6804375

Other Link： https://www.webofscience.com/wos/woscc/full-record/WOS:000355108400088

Inception and Expansion Process of Surface Flashover on Solid Dielectrics in Vacuum International conference

Y. Nakano, H. Kojima, N. Hayakawa, K. Tsuchiya, H. Okubo

2nd International Conference on Electric Power Equipment - Switching Technology 2013.10.22 Nagoya University

Event date： 2013.10

Language：English Presentation type：Oral presentation (general)

Venue：Matsue Country：Japan

Surface discharge on solid insulator in vacuum, which is one of the most significant phenomena under high electric field, prevents vacuum circuit breaker and vacuum interrupter from applying to higher voltage level. To clarify the mechanism of surface flashover, we investigated the transiently-formed charge characteristics on alumina dielectrics in the development process of surface flashover, by using electrostatic probes behind alumina dielectrics and measuring the light emission image of flashover. As a result, we found out that charge distribution on the alumina dielectrics in the inception of surface flashover depends on the electron emission sites on the cathode and influences the expansion process of surface flashover in vacuum. © 2013 IEEE.

DOI： 10.1109/ICEPE-ST.2013.6804361

Other Link： https://www.webofscience.com/wos/woscc/full-record/WOS:000355108400074

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