Abstract：The breaking performance of high voltage SF6 circuit breaker primarily depends on the dielectric recovery characteristics. During the breaking, gas flow in the transonic flow paths inevitably generates the turbulence and shock, and the gas flow parameters exists chaos, while the gas flow movement is complex in microsecond time level and millimeter space level. Based on the finite volume method, the gas flow field of 550kV singe-break high voltage SF6 circuit breaker under small capacitive current interruption is simulated, by changing the contour of nozzle structure can effectively control the gas flow paths, and also the behavior of gas flow parameters are changed. And the finite element method is used to simulate the electric field of the arc quenching chamber, and based on the streamer theory different dielectric recovery characteristics under different nozzle structures are obtained. Because the dielectric recovery exists chaos during breaking, the breaking performance can be affected accordingly. And by changing the nozzle structures, the chaotic characteristics of the circuit breaker can be effectively regulated in order to improve the dielectric recovery characteristics and the breaking performance.
冷雪,刘晓明,曹云东,韩颖,王尔智. 气流流路对高压SF6断路器介质强度混沌影响[J]. 电工技术学报, 2015, 30(6): 162-168.
Leng Xue,Liu Xiaoming,Cao Yundong,Han Ying,Wang Erzhi. Effect of Gas Flow Path on Dielectric Recovery Chaos Characteristics of High Voltage SF6 Circuit Breaker. Transactions of China Electrotechnical Society, 2015, 30(6): 162-168.
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