アルミナの高温中電気絶縁破壊に関する沿面距離依存機構

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: 2021/07/01

タイトル(英語): Mechanism of Creepage Distance Dependency for Electrical Breakdown of Alumina at High Temperature

著者名: 西下　貴之（筑波大学大学院システム情報工学研究科），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 (Graduate School of Systems and Information Engineering, University of Tsukuba), Masayoshi Ishida (Graduate School of Systems and Information Engineering, University of Tsukuba)

キーワード: アルミナ，高温絶縁，絶縁破壊，沿面距離，不平等電界　　alumina，high temperature electrical insulation，breakdown，creepage-distance，non-uniform electric field

要約(英語): Solid Oxide Fuel Cells (SOFCs), which work at 600 ～ 1000℃ and have efficiencies of over 60%, are expected to be larger capacity. However, expanding SOFCs will rise operating voltage and increase the risk of insulation failure. Extending creepage distance is one of the ways to reduce the risk. In order to clarify the effect of extending creepage distance on dielectric strength, it is indispensable to elucidate the mechanism of creepage distance dependency for electrical breakdown in high temperature and non-uniform electric field.In this paper, surface breakdown voltage for alumina (Al2O3) at 700 ～ 900℃ was measured, changing creepage distance from 4 mm to 20 mm. As a result, at 4 ～ 8 mm, breakdown voltage was proportion to the 0.4 ～ 1.2th power of creepage distance. However, at 8 ～ 12 mm, breakdown voltage decreased with extending creepage distance and indicated dependency on Paschen's law. At 12 ～ 20 mm, breakdown voltage was proportion to the 0.25 ～ 0.3th power of creepage distance. At creepage distance of 8 mm, breakdown voltage was over 3 kV. Therefore, the voltage of primary insulation part should be 3 kV or less to prevent increase in size and cost.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.141 No.7 （2021）

本誌掲載ページ: 413-419 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/141/7/141_413/_article/-char/ja/