Transient Charging Characteristics in Surface Flashover Development Process due to Explosive Electron Emission in Vacuum
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- Nakano Yusuke
- Nagoya University
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- Kojima Hiroki
- Nagoya University
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- Tsuchiya Kenji
- Hitachi, Ltd.
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- Hayakawa Naoki
- Nagoya University
Bibliographic Information
- Other Title
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- 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進展過程の過渡帯電特性
Abstract
For the development of higher voltage vacuum circuit breakers (VCB) and vacuum interrupters (VI), surface discharge phenomenon in vacuum is one of the most significant issues. We measured the charge activity on alumina dielectrics in vacuum through ultra-high speed optical and electrical measurements. We found out that the surface flashover in vacuum starts with an explosive electron emission (EEE) with the higher current density, which is the electron emission from the cathode, and results in the surface flashover development. Transient charge on the alumina dielectrics formed by electrons emitted by EEE influences the distortion of electric field distribution around the cathode rod and then the subsequent flashover development. Especially, in the case of the shorter gap between the cathode rod and the alumina dielectrics, the electron emission could be suppressed by the relaxation effect of the electric field due to the transient charge accumulation.
Journal
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- IEEJ Transactions on Fundamentals and Materials
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IEEJ Transactions on Fundamentals and Materials 134 (11), 578-584, 2014
The Institute of Electrical Engineers of Japan
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Details
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- CRID
- 1390282679576802432
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- NII Article ID
- 130004704295
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- ISSN
- 13475533
- 03854205
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed