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http://dx.doi.org/10.5370/JEET.2010.5.2.264

Analysis of Dielectric Breakdown of Hot SF6 Gas in a Gas Circuit Breaker  

Kim, Hong-Kyu (Korea Electrotechnology Research Institute)
Chong, Jin-Kyo (Korea Electrotechnology Research Institute)
Song, Ki-Dong (Korea Electrotechnology Research Institute)
Publication Information
Journal of Electrical Engineering and Technology / v.5, no.2, 2010 , pp. 264-269 More about this Journal
Abstract
This paper presents the analysis of the dielectric characteristics of a hot $SF_6$ gas in a gas circuit breaker. Hot gas flow is analyzed using the FVFLIC method considering the moving boundary, material properties of real $SF_6$ 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 $SF_6$ gas; Dielectric breakdown; Critical electric field; Arc plasma;
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