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Analysis of Dielectric Breakdown of Hot SF6 Gas in a Gas Circuit Breaker
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 Title & Authors
Analysis of Dielectric Breakdown of Hot SF6 Gas in a Gas Circuit Breaker
Kim, Hong-Kyu; Chong, Jin-Kyo; Song, Ki-Dong;
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 Abstract
This paper presents the analysis of the dielectric characteristics of a hot gas in a gas circuit breaker. Hot gas flow is analyzed using the FVFLIC method considering the moving boundary, material properties of real gas, and arc plasma. In the arc model, the re-absorption of the emitted radiation is approximated with the boundary source layer where the re-absorbed radiation energy is input as an energy source term in the energy conservation equation. The breakdown criterion of a hot gas is predicted using the critical electric field as a function of temperature and pressure. To validate the simulation method, breakdown voltage for a 145kV 40kA circuit breaker was measured for various conditions. Consistent results between the simulation and experiment were confirmed.
 Keywords
Gas circuit breaker;Hot gas;Dielectric breakdown;Critical electric field;Arc plasma;
 Language
English
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