雾霾对冲击放电路径影响特性的分析

Effects of Haze Environment on Discharge Path Under Lightning Impulses

由于经济规模的迅速扩大和城市化进程的加快,雾霾现象日趋严重,这些雾霾多发地区是我国输电走廊或用电高负荷密度地区。为研究雾霾对放电发展的影响,利用水雾、粉煤灰等模拟雾霾天气,采用雷电冲击电压进行了雾霾对击穿电压和放电路径影响的实验研究。研究结果表明:当雾霾的粒径范围<0.01mm时,雾霾间隙的击穿电压始终较空气间隙的高,放电路径选择雾霾的概率<50%;当粒径范围为0.01～0.1mm时,正电压下选择概率<50%,雾霾间隙的击穿电压较空气间隙的高,而负电压下选择概率>50%,雾霾间隙的击穿电压较空气间隙的低。雾霾中放电发展是电场的畸变和雾霾颗粒与粒子间作用联合影响的结果。

Due to enlargement of economical scale and acceleration of urbanization, atmospheric haze is on the rise in China. High density of transmission line corridors or power load areas are located in these regions. In order to understand the effect of haze on the discharge development, mist, flyash and ferric oxide are employed to simulate haze environment. Lightning impulses are applied to carry out to gain insight into the influence of haze on the breakdown voltage and discharge path in this work. The results show that when the average haze particle diameters （D） in haze are smaller than 0.01 mm, the percentages of the selection of haze is always less than 50%, and the breakdown voltages in haze are higher than that in air. When 0.01 mm〈D〈0.1 mm, the percentages of the selection of haze is less than 50 % under positive lightning impulses but above 50% under negative lightning impulses, and the break- down voltages in haze are higher than that in air under positive lightning impulses but lower than that in air under negative lightning impulses. The process of discharge is caused by the composite effect of the electrostatic field alteration and the interaction between ion, electron, photon and haze particles.