【摘要】 根据风洞模拟实验,研究发现扬沙和沙尘暴过程中:①导线电位随风速及输沙量的增大,呈指数规律递增;②随沙粒粒径的增大,电位差随高度的变化具有上扬的趋势;③粒径愈大,电位差反而减小;④沙尘暴中导线电位高于扬沙天气;⑤伴雨状况下的沙尘暴较之非伴雨状况下具有较强的电位差;⑥导线材料相同时,导线直径越小,电位差愈大;⑦导线直径相同时,铝线较之铜线具有较强的电位差,且当裸铝线两端加电压2～4kV时,出现尘端放电现象。更多还原

【Abstract】 Wind tunnel simulation of the effect of sandstorm on the voltage of aerial electrical wire showed that (1) blowing sands exhibit an obvious electrification phenomenon while impacting aerial electrical wire during sandstorm phase, thereby the aerial wire gains a certain potential and its voltage increases exponentially with the increasing of wind velocity and sand transport rate; (2) with the increase of sand particle size, the height of the potential value occurring will be raised; (3) the bigger the particle size, the smaller the electric potential; (4) the potential value of aerial wire during sandstorm experiment is obviously greater than that during blowing sand experiment; (4) the potential value of aerial wire is positively correlated to sand moisture content, but there exists a limit; (5) the potential value of aerial wire is negatively correlated to aerial diameter in the same material condition, and in the same diameter the aluminum wire could generate larger potential value than copper aerial. The simulating experiment also demonstrated that the blowing sand could trigger electric discharge processes when applied a 2～4 kV high voltage to bare aluminum wire ends.更多还原