GIS局部放电特高频检测灵敏度的检验方案细化研究

Investigation of Improvement of Sensitivity Verification of Partial Discharge Detection Using UHF Method in GIS

为了检验局部放电特高频检测装置的灵敏度,笔者对目前广泛应用的CIGRE方案进行了实验研究。通过对脉冲源发射的特高频信号时域和频域特征分析,检验了脉冲源与实际放电源的等效性。试验发现脉冲源激发的特高频信号峰峰值随输出电压升高呈线性增长,与悬浮金属体作为放电标准源激发的特高频信号峰峰值与放电量的关系曲线类似。笔者结合对GIS中局部放电激发和传播特性的研究,提出了细化CIGRE关于特高频检测系统灵敏度检验草案的建议。

To verify the sensitivity of the ultra high frequency（UHF） detection, the GIGRE method for the verification of sensitivity, which is used worldwide, was applied in the paper. According to the analysis of the characteristics of the time domain and frequency domain of the UHF signal excited by the pulse generator, the equivalence of the pulse generator and the actual partial discharge source was verified. It indicates that the peak-to-peak value of the UHF signal induced by the pulse generator increases linearly with output voltage, which is similar with the linear correlation curve between the apparent charge and the peak-to-peak value of the UHF signal excited by the floating metal. In this paper, combined with the research about the excitation and propagation of PD in GIS, several proposals were presented to improve the GIGRE method for the sensitivity verification of the UHF PD detection system.