高温水素中沿面絶縁破壊特性に関する対空気耐力と統一的解釈

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2023/01/01

タイトル(英語): Creepage Insulation Properties in Hydrogen at High Temperatures Compared to Air and Both Unified Mechanism Consideration

著者名: 西下　貴之（富士電機（株）インダストリー事業本部），三井　雅史（（地独）東京都立産業技術研究センター），石田　政義（筑波大学大学院システム情報工学研究科）

著者名(英語): Takayuki Nishishita (Industry Business Group, Fuji Electric Co., Ltd.), Masashi Mitsui (Tokyo Metropolitan Industrial Technology Research Institute), Masayoshi Ishida (Graduate School of Systems and Information Engineering, University of Tsukuba)

キーワード: 高温，無機材料，沿面，絶縁破壊，固体酸化物形燃料電池，水素_x000D_　　high temperature，inorganic material，creepage，dielectric breakdown，solid oxide fuel cell，hydrogen

要約(英語): Solid Oxide Fuel Cells (SOFCs) generate electricity efficiently for high reaction activity and internal reforming of hydrocarbons at high temperatures, which consequently have the potential to replace conventional thermal power generations. It is expected to adjust the output with voltage whenever possible when the scale of SOFC enlarges more than the megawatt-class to reduce transmission loss. Our group aims to establish the design guideline for high-voltage insulation in high-temperature oxidizing and reducing atmospheres. This paper describes the creepage distance dependency of DC breakdown voltage in hydrogen assumed an anode environment. The authors measured the characteristics of alumina at 700 - 900℃ and compared them to that in air assumed a cathode environment, which was clarified in a previous report. In both atmospheres, the results show that the breakdown mechanism follows Townsend ’s theory in a wide range; however, it affected by space charge in a region of specific creepage distances. Moreover, creepage distance to obtain the same breakdown voltage and the mechanism transition in hydrogen is approximately twice that in air. It is suggested that the mean free path and ionization index for impact ionization could govern the relationship between creepage distance and breakdown strength, regardless of the gas type, hydrogen or air.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.143 No.1 （2023） 特集：2023年研究開発の動向と最前線

本誌掲載ページ: 31-37 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/143/1/143_31/_article/-char/ja/