多针对板电晕放电中针尖半径对伏-安特性影响

研究了多针对板电晕放电中针尖半径a变化时放电电流I和外加电压V的关系.实验得到,当a在0.3 mm到1.0 mm之间时,对I的变化影响不大;在a变小过程中,I值略有增加;当a小于0.1 mm时,I值有明显的提高,前期研究中近似得到的伏-安关系式I=CV(V-Vs)中C反比于dln(2d/a),这同实验结果矛盾.分析指出伏-安关系式中Vs引入不正确,以阈值场强Ec处电压Vc代替Vs,修正伏-安关系式,最终得到实验和分析一致的结果,并解释了多针对板放电中a对伏-安特性的影响.

Effects of Needle Radius on Current-Voltage Characteristics of Multi-Needle-to-Plate Corona Discharge

The work studies on the relationship between discharge current I and applied voltage V when needle radius a varied in the mode of multi-needle-to-plate corona discharge. No obvious effects on I were observed when a changing between 0.3 mm and 1.0 mm; in fact, I increases slightly when a descends. Alternatively, I showed obvious boost when a is less than 0.1 mm. The result which was approximately generated in the previous research, that the C value in current-voltage equation I=CV(V-Vs) is inverse proportion to dln(2d/a), is proved to be not consistent with the experimental result. The study prompted that Vs is wrongly introduced into the equation, and should be replaced by the voltage Vc which corresponds to the threshold intensity Ec. Then the equation was modified and actually agreed with the experimental results, and it could interpret the effects of a on current-voltage characteristics in the multi-needle-to-plate corona discharge.