多针电极结构双极电晕放电伏安特性

为提高电晕放电的能量密度和放电稳定性,提出了针阵列电极结构的双极电晕放电方式并研究了多针电极结构双极电晕放电的伏安特性。实验得出放电电流I随针尖半径a和电极间距d的增大而减小,随相邻针尖间距s的增大而增大,但当s≥40 mm时,相邻针尖的相互作用已很小,I几乎不变;d对火花击穿电压的影响较大,a对其的影响较小。由于电极结构的对称性,高压电极的极性对放电无明显的影响,正负电晕放电的伏安曲线和火花击穿电压均较为接近。将多针电极双极电晕放电电流I等效成电极间距为d/2的多针对板正、负电晕放电电流I1和I2相加,分析了I>I1+I2的原因,并推知其电离区内电子密度也有相应规律。

Current-Voltage Characteristics of Bipolar Corona Discharge in Multi-needle Electrode Configuration

To increase the discharge energy density and the discharge stability,this paper proposed a method of bipolar corona discharge in needle-matrix electrode configuration,and investigated the current-voltage characteristics of bipolar corona discharge in Multi-Needle Electrode Configuration.The experimental results show that the discharge current I decreases with increase of the needle radius a or the space between electrodes d,and increases with the increase of space between needles s.When s is greater than 40mm,the change of I is little.Comparing to a,d has a greater rule in the spark breakdown voltage.Due to the symmetry of the discharge electrode configuration,the polarity of the HV electrode has no obvious influence on the discharge.The I-V curves and the spark breakdown voltages are both similar whether positive or negative bipolar corona discharge.The bipolar corona discharge with the space between electrodes of d(The discharge current is I.) is compared to a positive and a negative needle-to-plate corona discharge with the space between electrodes of d/2(The discharge current is I1 and I2.),the reason of I> I1 I2 has been analyzed,and it can be deduced that the electrons density in the ionization zone has the corresponding rule.