直流电晕电流时域脉冲特性的统计分析

Statistical Analysis on the Time-Domain Characteristics of the DC Corona Current Pulse

为了研究直流正负电晕电流时域脉冲的特性,基于实验室开发的高频电晕电流高压端测量系统,开展了不同条件下直流正负电晕的线板放电实验。基于大量实验数据,统计、对比了正、负极性电晕脉冲的幅值、上升时间、半波时间和重复频率等特征参数随导线电压及导线半径变化的规律。实验结果表明：导线电压对单个正、负脉冲波形的影响较小,主要影响脉冲的重复频率;负脉冲的上升时间平均值为20~30 ns,半波时间的平均值为90~110 ns;正脉冲的上升时间平均值为40~50 ns,半波时间的平均值为140~160 ns;随着导线电压的升高,正、负脉冲重复频率均迅速增大,但相同电压下,正脉冲的重复频率显著小于负脉冲的重复频率,负脉冲重复频率约为正脉冲的15~25倍。

ABSTRACT： In order to study the time-domain characteristics of DC corona current pulse, a high-frequency current measurement system is built to measure corona currents on HV terminal under different conditions. Based on the numerous experimental results, the characteristics of positive and negative corona current pulses, such as the amplitude, rise time, half-wave time and repetition frequency, are statistically analyzed. Statistical analysis of experimental results shows： the applied voltage has little effect on the pulse waveform of positive and negative corona, but it largely affects the pulse repetition rate; the rise time and half-peak time for negative pulse and positive pulse are respectively 20 -30 ns, 90 - 110 ns and 40 -50 ns, 140 ~ 160 ns; at the same applied voltage, the pulse repetition rate of negative corona pulse are 15 -25 times larger than that of positive corona pulse.