电晕离子流对先导放电路径的影响

为探明当空气中含有电晕产生的离子时(离子背景),对雷电先导的发展、击穿过程和路径的选择有何影响,分别采用两种不同的实验方法研究了正、负离子流对先导放电进展路径影响的特点及规律,两种方法得出的一致结果表明,有离子背景的雷电先导放电路径具有选择负离子背景而回避正离子背景的特点和规律并运用电子崩发展和电场作用两方面原理,分析了离子背景的影响机制。这对于特高压输电线路与设备的防雷及其绝缘设计的进一步研究具有重要参考意义。

Effect of Corona Ions on the Selection of the Discharge Path

This paper investigate the development, the breakdown process, and the discharge path selection of the lightning leader while there exsit corona iorns in the space. Two different experiment methods have been taken for studing the effects of the spatial ions on the selection of the air gap discharge path. Lightning impulse test with a independent iorns generator is used in method one. Lightning impulse test with DC pre stressing voltage is superimposed on is used in method two. Agreeable results have been obtained with both methods. The probability of the discharge path choosing negative ions space is fairly higher than that of choosing positive ions space. The mechanism of the effects of spatial ions is analyzed based on the development of electron avalanche and electric field. It may be as reference in further study on the lightning protection and insulation design for ultra high voltage line and the equipoment.