A theoretical model of nozzle ablation is proposed based on the analysis of nozzle materials and arc energy conversion. According to the simulation results, adding 1-5 percent filler into the main material can increase the arc energy absorbed by the nozzle, and the nozzle characteristics against the ablation can be improved efficiently. When the filler grain is larger than 10 micron, the starting ablation time can be prolonged. The research provides a theoretical basis for increasing the nozzle behavior against the arc ablation and prolonging the lifetime of SF6 circuit breaker.
研究电介质与半导体之间的接触带电、带电规律和带电控制,可有效地控制电力电子器件表面绝缘保护材料与半导体表面相互作用而形成的不同界面态和界面电荷,优化台面型电力电子器件表面空间电荷区宽度、表面电场分布,提高表面耐压.对加入不同填料的聚酯改性硅漆(SP),测量其与表面氧化和表面钝化的n型和p型硅片接触后表面带电极性和带电量,得出一个接触带电序列.接触带电序列表明,绝缘保护材料与各种硅片的接触,实质上是保护材料与硅片表面物质的接触,与硅片的类型和内部结构无关.
在分析高压SF6断路器开断大电流时,电弧对喷口烧蚀机理的基础上,进行了喷口材料改性试验研究.得出聚四氟乙烯中加入MoS2,BN,光致蓄光材料(PL),复合聚四氟乙烯的介电性能、光学性能、耐电弧烧蚀性能和线膨胀系数的变化规律.研究结果为提高喷口的耐电弧烧蚀性能、改善喷口材料的介电性能和工艺性提供了理论依据.
