非均匀场中气固两相体雷电冲击U50的实验研究

通过对几种典型固体颗粒的气固两相体放电实验研究,发现其击穿电压具有极性效应,负极性条件下体积比对雷电冲击U50影响显著,使雷电冲击U50降幅达到30%左右,并且小颗粒的击穿电压比大颗粒的击穿电压低;正极性条件下击穿电压随体积比变化呈小波动变化特性,体积比及颗粒大小对击穿电压影响不显著。另外,与空气放电一致的是,相同体积比下正极性雷电冲击击穿电压低于负极性。

Test Study on 50% Lightning Impulse Discharge Voltage Across Rod-plane Gap with Two-phase Mixture of Gas and Solid Particles

Based on the analysis of discharge experiment on two-phase mixture of gas and several kinds of solid particles, it is shown that the breakdown voltage is related to polarity. Under the conditions of the negative polarity, the volume ratio makes great effect to the 50% lightning impulse discharge voltage Us0, the decreased amplitude is up to about 30%. The breakdown voltage of small particles is lower than that of big particles. Under the conditions of the positive polarity, the breakdown voltage fluctuates with the change of the volume ratio, but both the volume ration and the partide size have little effects to Us0. In addition, it is the same as the discharging in air, that the breakdown voltage of positive polarity is lower than that of the negative polarity in the same volume ratio.