| Title |
Investigation of Small Current Interruption Performance for New Type of Interrupting Chamber in SF_{6} Gas Circuit Breaker |
| Authors |
송원표(Song, Won-Pyo) ; 권기영(Kweon, Ki-Yeoung) ; 이재성(Lee, Jae-Sung) ; 송기동(Song, Ki-Dong) ; 김맹헌(Kim, Maeng-Hyun) ; 고희석(Ko, Hee-Seok) |
| Keywords |
SF6 gas ; GCB(Gas Circuit Breakers) ; Nozzle ; Small capacitive current ; Parallel-hybrid ; Puffer cylinder ; Cold gas flow ; Thermal-expansion chamber ; Current zero ; Dielectric recovery |
| Abstract |
This paper presents computer simulation results for developing new type of SF_{6} Circuit Breaker in terms of cold gas flow after small current interruption. This cold gas flows down a nozzle into the chamber of a circuit breaker. There are many difficult problems in analyzing the gas flow due to complex geometry, moving boundary, shock wave and so on. When predicting the dielectric capability of a gas circuit breaker after interruption, the gas pressure and density distributions due to the cold gas must be considered in addition to the electrical field imposed across the gas. A self-coded computational fluid dynamics (CFD) program is used for the simulation of cold gas flow in order to evaluate the electrical field characteristic across open contacts and transient characteristics of insulations after small current interruption. |