研究者詳細 - 小島　寛樹

講演・口頭発表等 - 小島　寛樹

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小名木良太，小島寛樹，飯塚伸介，小林将人，早川直樹

令和6年電気学会全国大会 2024年3月14日電気学会

永木雄也，林恭平，神野裕亮，小島寛樹，吉田昌展，早川直樹

電気学会誘電・絶縁材料/放電・プラズマ・パルスパワー/高電圧合同研究会 2024年1月20日電気学会誘電・絶縁材料/放電・プラズマ・パルスパワー/高電圧技術委員会

Fabrication and Flashover Characteristics of Permittivity and Conductivity Graded Materials (ε/σ-FGM) for DC-GIS Spacers 国際会議

R. Sugimoto, T. Kato, H. Kojima, N. Hayakawa

2023 International Symposium on Electrical Insulating Materials 2023年9月25日 IEEJ Technical Committee on Dielectrics and Electrical Insulation

開催年月日： 2023年9月

記述言語：英語会議種別：口頭発表（一般）

開催地：Matsue 国名：日本国

The progressive development of HVDC transmission system has urged us to develop a novel technique in supporting the performance of DC power apparatus. Functionally Graded Materials (FGM) are one of the techniques that allow us to control the electric field distribution within the DC insulation system. Our previous works have analytically revealed that FGM with spatial permittivity ε and conductivity σ distributions applied to a 320 kV DC-GIS spacer could reduce the maximum electric field under all DC operating conditions. In this paper, we fabricated a cone-type ε/σ-FGM spacer for DC-GIS and experimentally verified its flashover voltage improvement effect.

DOI： 10.23919/ISEIM60444.2023.10329009

Scopus

放電・プラズマ・パルスパワー分野における研究・技術開発の歩み今後の展望招待有り

小島寛樹，佐々木徹，高橋克幸，稲田優貴，中川雄介，中野裕介

令和5年電気学会基礎・材料・共通部門大会 2023年9月8日電気学会基礎・材料・共通部門

回転機絶縁システムへの適用を目指したセルロースナノファイバー複合体の基礎特性

岩永拓実，山下優，岡本徹志，小島寛樹，早川直樹，古田尚，奥村浩史，安食厚志，山中雄太，梅本貴弘

令和5年電気学会基礎・材料・共通部門大会 2023年9月9日電気学会基礎・材料・共通部門

真空中沿面放電の初期進展過程における電子軌道追跡による過渡帯電・発光特性

杉浦拓真，小島寛樹，早川直樹，中野裕介

令和5年電気学会基礎・材料・共通部門大会 2023年9月7日電気学会基礎・材料・共通部門

DC-GIS用ε/σ-FGMスペーサの作製および直流耐圧向上効果

杉本遼次，加藤拓夢，小島寛樹，早川直樹

令和5年電気学会電力・エネルギー部門大会 2023年9月6日電気学会電力・エネルギー部門

高融点陰極表面への低融点陽極材料の付着による真空中コンディショニング効果の抑制

北直樹，小島寛樹，福田英昭，山村健太，早川直樹

令和5年電気学会電力・エネルギー部門大会 2023年9月6日電気学会電力・エネルギー部門

真空中高周波交流コンディショニングにおける耐圧向上効果の周波数および印加電圧依存性

小名木良太，小島寛樹，飯塚伸介，小林将人，早川直樹

令和5年電気学会電力・エネルギー部門大会 2023年9月6日電気学会電力・エネルギー部門

Temperature Rise in Conductivity Graded Materials (σ-FGM) Spacer for HVDC GIS/GIL 国際会議

Rachmawati, H. Kojima, N. Hayakawa, H. Okubo

23rd International Symposium on High Voltage Engineering 2023年8月29日 The Department of Electronic and Electrical Engineering of the University of Strathclyde

開催年月日： 2023年8月 - 2023年9月

記述言語：英語会議種別：口頭発表（一般）

開催地：Glasgow 国名：グレートブリテン・北アイルランド連合王国(英国)

Functionally graded permittivity and conductivity materials (ε/σ-FGM) application is a novel method to improve electric field distribution around HVDC GIS/GIL spacer. Since there is interdependency between temperature and conductivity, in this paper, the relationship between conductivity and the semi-conductive SiC filler concentrations in epoxy-based ε/σ-FGM spacer is clarified, and the effect of SiC filler concentrations to the leakage current (ILC), maximum temperature (Tmax), as well as maximum conductivity (σmax) are investigated through electric field and thermal simulation. The simulation results revealed that Tmax started to exceed the temperature of HV conductor when σmax exceeds 4×10-9 S/m and ILC is of a few hundreds of nA. Since this criterion corresponds to 21 vol% SiC-filled epoxy composite in σ-FGM, 5–10 vol% SiC-filled epoxy composite in the specified U-type σ-FGM spacer has low enough conductivity not to cause temperature rise.

DOI： 10.1049/icp.2024.0516

Scopus

Flashover Voltage of Permittivity Graded Materials (ε-FGM) Spacer with Metallic Particles in SF₆ Gas 国際会議

N. Hayakawa, H. Kato, T. Kato, H. Kojima, S. Kamohara, Y. Hoshina

23rd International Symposium on High Voltage Engineering 2023年8月29日 The Department of Electronic and Electrical Engineering of the University of Strathclyde

開催年月日： 2023年8月 - 2023年9月

記述言語：英語会議種別：ポスター発表

開催地：Glasgow 国名：グレートブリテン・北アイルランド連合王国(英国)

Functionally graded materials with spatial distribution of permittivity (ε-FGM) are promising for the compact, efficient and environmentally benign GIS spacers. In this paper, for the practical insulation design and installation of ε-FGM spacers to GIS, the risk of metallic particles on ε-FGM spacers is investigated. Experimental results using the fabricated cone-type ε-FGM spacers revealed that the metallic particles in permittivity-grading area on convex surface were the most harmful and reduced the flashover voltage in SF6 gas by about 40 %, compared with that without the particles. The flashover voltage was almost equal to that of the conventional spacers with a uniform permittivity distribution and the metallic particles in the maximum electric field area on concave surface. Thus, the risk of metallic particles on ε-FGM spacers can be almost the same as that of the conventional spacers.

DOI： 10.1049/icp.2024.0618

Scopus

Non-destructive Measurement of Permittivity Distribution in Permittivity Graded Materials (ε-FGM) by X-ray Computed Tomography 国際会議

N. Hayakawa, T. Kato, H. Kojima, H. Yanase, K. Okamoto

23rd International Symposium on High Voltage Engineering 2023年8月29日 The Department of Electronic and Electrical Engineering of the University of Strathclyde

開催年月日： 2023年8月 - 2023年9月

記述言語：英語会議種別：口頭発表（一般）

開催地：Glasgow 国名：グレートブリテン・北アイルランド連合王国(英国)

Toward the compact gas insulated switchgears (GIS), we have been investigating a novel electric field grading technique around the GIS spacer by “functionally graded materials (FGM)” with spatial distribution of permittivity (ε-FGM). We have already designed and fabricated the cone-type ε-FGM spacer samples with the relative permittivity (εr) of 10.0-4.0 for an actual 245 kV-class GIS as well as those with εr of 12.7-4.0 for its 1/4-sized model and revealed the improvement of flashover voltage in SF6 gas through experiments and calculations. It is important to develop a non-destructive method to measure and verify the permittivity distribution inside the spacer to realize the practical application of ε-FGM spacers. In this paper, in order to establish the non-destructive measurement method for ε-FGM spacers with the relative permittivity distribution, ZH focused on X-ray computed tomography (CT). We obtained the relationship between the permittivity and the X-ray transmission intensity by analysing different disc-shaped samples (or =12.2-4.2) and verified the measurement possibility of the relative permittivity distribution inside ε-FGM spacer by comparison to the target distribution at the fabrication of ε-FGM spacer.

DOI： 10.1049/icp.2024.0517

Scopus

多端子直流送電システムの超電導限流器動作時における液体窒素の動的絶縁破壊電界の推定

西澤大将，小島寛樹，早川直樹

令和五年度電気・電子・情報関係学会東海支部連合大会 2023年8月28日電気学会東海支部，電子情報通信学会東海支部，情報処理学会東海支部，照明学会東海支部，映像情報メディア学会東海支部，日本音響学会東海支部，IEEE名古屋支部

真空中コンディショニングにおけるギャップ長と最適放電電荷量の関係

北直樹，小島寛樹，福田英昭，山村健太，早川直樹

令和五年度電気・電子・情報関係学会東海支部連合大会 2023年8月29日電気学会東海支部，電子情報通信学会東海支部，情報処理学会東海支部，照明学会東海支部，映像情報メディア学会東海支部，日本音響学会東海支部，IEEE名古屋支部

真空中高周波交流コンディショニングにおける多重絶縁破壊の時間間隔の印加電圧依存性

小名木良太，小島寛樹，飯塚伸介，小林将人，早川直樹

真空中沿面放電の初期進展過程における絶縁物表面への電界入射方向と2次電子なだれの関係

杉浦拓真，小島寛樹，早川直樹

電動推進航空機用モータ絶縁に適用する潤滑油の絶縁破壊特性の流量依存性

中澤尚輝，小島寛樹，有賀信雄，卯辰清志，渡邉瞬也，早川直樹

ε/σ-FGM（誘電率/導電率傾斜機能材料）による直流GIS用絶縁スペーサのフラッシュオーバ電圧向上効果

杉本遼次，小島寛樹，早川直樹

アルミ箔/油浸紙複合絶縁系における部分放電特性のアルミ箔電極ズレ幅依存性

林恭平，永木雄也，小島寛樹，吉田昌展，早川直樹

Electrode Material Adhesion between Anode and Cathode in Spark Conditioning in Vacuum 国際会議

N. Kita, H. Kojima, H. Fukuda, K. Yamamura, N. Hayakawa

30th International Symposium on Discharge and Electrical Insulation in Vacuum 2023年6月26日 Technical Committee of Electrical Dicharges, Plasma and Pulsed Power, IEEJ

開催年月日： 2023年6月

記述言語：英語会議種別：口頭発表（一般）

開催地：Okinawa 国名：日本国

We discuss the electrode material adhesion between cathode and anode during spark conditioning process in vacuum, and its effect on dielectric strength in terms of breakdown (BD) charge. We focus on the conditioning effects under rod-plane electrodes with different combination of electrode materials. The material of the rod (cathode) is Cu and that of the plane (anode) is stainless steel (SUS), and their gap length is 1 mm. We observe the electrode surface before and after conditioning experiments. As a result, when BD charge is smaller than 2.0 mC, the anode material (SUS) is found on the cathode (Cu) surface and the dielectric strength becomes high. With increasing BD charge, the adhesion ratio of anode material on the cathode surface decreases, and the dielectric strength also tends to decrease. In the case where BD charge is larger than 2.0 mC, on the contrary, the cathode material (Cu) adheres to the anode (SUS) surface and the dielectric strength is low, which is consistent with the conditioning characteristics when both the cathode and anode are made of Cu. These results indicate that up to a certain BD charge, the anode material adheres to the cathode surface, and above this BD charge the cathode material adheres to the anode surface. When the cathode (Cu) surface is excessively melted, i.e., damaged, the cathode material Cu can adhere to the anode SUS surface. In other words, too large BD charge can not only fails to improve the dielectric strength due to the adhesion of the anode material SUS to the cathode Cu surface, but also causes a critical decrease in the dielectric strength, or deconditioning.

DOI： 10.23919/ISDEIV55268.2023.10201112

Scopus

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講演・口頭発表等 - 小島 寛樹

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講演・口頭発表等 - 小島　寛樹