为了研究SF6气体中金属尖刺处局部放电伴随的发光现象及特性,搭建了一套局部放电紫外光、可见光及近红外光波段同步光学检测平台.采用均匀背景电场中的针-板电极作为实验对象,采用逐级升压方式对SF6气体中针-板电极进行局部放电试验,分别对不同电压下的局部放电光脉冲信号进行测量,并对局部放电光脉冲的N-?柱状图及幅值分布区间进行统计分析.结果表明:3种光谱波段下检测到的脉冲放电重复率和脉冲幅值分布区间宽度与外施电压都具有良好的线性一致性关系;随着外施电压升高,3种光谱波段的放电光脉冲幅值分布范围逐渐增大,且存在饱和现象和明显的极性效应;紫外光和可见光范围内的光脉冲具有较大的活跃性,而近红外光波段内的光脉冲多出现在放电较为剧烈的情况.该研究结果可为光测法在GIS设备内绝缘检测中的应用提供参考.
In order to study the light pulse characteristics of partial discharge of metal spikes in SF6, a synchronous optical test platform was set up to detect the light pulse characteristics at ultraviolet, visible, and near-infrared regions. The light pulse signals caused by partial discharge of point-plane electrodes were investigated by adopting step boost method at different applied voltages. The N-? histograms and amplitude distribution range of light pulse signals were analyzed. The results show that the pulse discharge repetition rate and the amplitude distribution range width under three different spectral regions have good linear relation with the applied voltage. With the increase of applied voltage, the distribution range of light pulse at three different spectral regions increases, and the light saturation phenomenon and strong polarity effect emerge. The pulse light at ultraviolet and visible regions has strong variability, and the pulse light at near-infrared region appears when the partial discharge is more violent. This experimen-tal results could provide reference for the application of light pulse detection method in the detection of GIS insulation.
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