大气电场下金属尖端电晕放电阈值的研究

Research on Metal Tip Corona Discharge Threshold under Atmospheric Electric Field

针对大气电场下金属尖端电晕放电阈值的问题,通过理论分析与试验相结合的方法,测量了电晕放电阈值电压并利用ANSOFT Maxwell有限元软件对阈值电场的计算,研究了不同金属、高度、环境以及有无尖端时金属尖端电晕放电电压阈值和电场阈值的变化规律,得出以下结论:大气电场下,电导率不同的铁、铝、铜,电晕放电电压阈值和电场阈值大小与电导率关系不大;同温同湿,同高度金属棒的电晕放电电压阈值与电场阈值大小与尖端高度是负相关的;同温同湿,金属棒高度与电晕放电电压阈值和电场阈值是负相关的;湿度与温度的增大都会造成电晕放电电压阈值与电场阈值的降低,但温度的影响比湿度更大。

In view of the mental tip corona discharge threshold problem under the atmospheric electric field, through the method of theoretical analysis combined with test, the corona discharge threshold voltage is measured and threshold electric field is calculated by the finite element software ANSOFT Maxwell, the change rule of metal tip corona discharge voltage threshold and electric field threshold under different metal, height, environment and presence of tip, and obtain following conclusions： under the atmospheric electric field, the size of corona discharge voltage threshold and electric field threshold has little relation with conductivity for iron, copper and aluminum with different conductivity; corona discharge voltage threshold and electric field threshold of metal bar is negative correlation with tip height under same temperature, humidity and height; the increase of humidity and temperature will both cause the decrease of corona discharge voltage threshold and electric field threshold, but the effect of temperature is larger than the humidity.