雾霾模拟环境下棒-板间隙交流放电特性研究

Study on AC Discharge Characteristics of Rod-Plate Gap in Haze Simulation Environment

目前国内外学者对雾中棒-板间隙交流放电特性做了大量研究,但往往忽略了灰霾颗粒的影响,且尚未深入研究雾与雾霾环境下棒-板间隙交流放电特性的区别,因此设计了雾霾模拟装置对棒-板间隙进行交流放电特性研究。在纯雾、纯灰霾及雾霾三种环境下进行棒-板间隙的交流放电试验,比较了棒-板间隙交流放电特性的区别,分析了雾霾颗粒对棒-板间隙交流放电特性的影响机理。结果表明:该模拟装置能模拟自然雾霾;纯雾环境下,棒-板间隙击穿电压随雾浓度呈先增后降的趋势;纯灰霾环境下,灰霾颗粒粒径小于10μm时的击穿电压低于干燥空气击穿电压,颗粒粒径大于10μm时的击穿电压高于干燥空气击穿电压,在粒径相同的条件下,击穿电压与灰霾浓度及成分都相关;雾霾环境下,间隙击穿电压高于干燥空气击穿电压,低于纯雾条件下间隙击穿电压,与雾霾粒径大小呈负相关,不同雾霾浓度下的间隙击穿电压会因雾霾成分而变化。

At present,scholars at home and abroad have done a lot of research on the AC discharge characteristics of the rod-plate gap in the fog.However,the influence of the haze particles is often ignored,and the difference between the AC discharge characteristics of the rod-plate gap in the fog and the haze environment has not been studied in depth.Therefore,a haze simulation device is designed to study the AC discharge characteristics of the rod-plate gap.AC discharge tests of rod plate gap are carried out in three environments:pure fog,pure haze and haze.The differences of AC discharge characteristics of rod plate gap are compared,and the influence mechanism of haze particles on AC discharge characteristics of rod plate gap is analyzed.The results show that the simulation device can simulate natural haze.In a pure fog environment,the breakdown voltage of the rod-plate gap increases first and then decreases with the fog concentration.In a pure haze environment,the breakdown voltage of haze particles smaller than 10μm is lower than that of dry air,and the breakdown voltage of particles larger than 10μm is higher than that of dry air.Under the condition of the same particle size,the breakdown voltage is related to the concentration and composition of the haze.In the haze environment,the gap breakdown voltage is higher than that in dry air and lower than that in pure fog,which is negatively correlated with the size of haze particles.The gap breakdown voltage under different haze concentrations will change with the composition of haze.