电晕放电若干特性的实验研究

为研究空中带高压物体的电晕放电辐射信号特征，采用组建的静电放电测试系统对电晕电流及其辐射信号进行了实验研究。实验表明：电晕放电脉冲波形具有明显的极性效应。负极性下先发生电晕放电，且电流波形的上升时间小于正电晕电流；电晕放电信号波形前沿陡峭，上升时间从几个ns到二十几个ns；电晕放电辐射信号的频谱成钟型连续谱，其频率范围主要集中在20～100MHz之间；极性不同，电晕放电辐射信号波形不同，并且正电晕信号幅值高于负电晕信号幅值。

Experimental Research on the Characteristics of Corona Discharge

In order to study the characteristics of signals radiated from corona discharge from high-voltage object in the air, the experimental research on the characteristics of corona current and signal radiated froin corona discharge is carried out using the electrostatic discharge testing system. The experiment shows that： firstly, the corona discharge pulse waveforms have an obvious polarity effect;negative corona discharge occurs first and the pulse amplitude is shorter than that of positive corona; the rising time of pulse waveform of negative corona current is smaller than that of positive corona current. Secondly, the waveforrn of signal radiated from corona discharge has a steep rising edge;the rising time is from several ns to a score of ns. Thirdly,the spectrum of signal radiated from corona discharge is continual spectrum, whose frequency range is from 20 MHz to 100 MHz. Finally when the polarity is different,the waveform of signal radiated from corona discharge is different and the amplitude of signal of positive corona is higher than that of negative corona.