低气压下棒-线长间隙流注绕线特性研究

Research of Characteristics of Streamer Bypass the Wire Under Low Pressure and Rod-wire Long Gap Condition

为研究低气压工频电压下流注绕线特性及其产生原因,利用实验平台对30 kPa下200~600 mm棒-线长间隙进行放电实验研究,测试了不同间隙距离下流注绕线的可能性以并对绕线的产生机理进行分析。研究结果表明:当间隙距离达到500 mm时棒-线间隙流注放电存在绕线现象,且间隙距离增加导致的流注曲折数量和程度增加都将增大绕线概率。流注绕线现象是线电极本身对电场分布的影响和其表面负电晕中的阳离子空间电荷畸变电场相互制衡的结果,当负电晕阳离子空间电荷对阳极流注头部的静电排斥作用占主导作用时便导致流注绕线。研究结果为低气压下长间隙放电特性研究提供参考。

To research the characteristics of AC streamer bypass the wire electrode under low pressure condition,this paper carried out AC discharge test for 200~600 mm rod-wire long gap at 30 kPa,and the possibility of streamer bypassing the wire under different gap length and its mechanism are analyzed.The results shows that,the bypassing phenomena of streamer exist in rod-wire gap when the gap length reaches 500 mm,and with the increase of gap length,the possibility of streamer bypassing wire increases with the increase of number and degree of zigzag of streamer.The phenomena of streamer bypassing wire is caused by the checks and balances between the effect of wire electrode on electric field distribution and the distortion of electric field caused by positive-ion space charges in its negative corona.When the electrostatic repulsion of positive-ion space charges in negative corona on positive streamer head play dominant role,it may lead to a phenomena of streamer bypass the wire.These results have reference value for the study of long gap discharges under low pressure condition.