基于紫外成像的污秽绝缘子放电特性研究

污秽绝缘子在一定的湿度下会形成放电并辐射出紫外光信号,日盲紫外成像是一种有效的放电检测方法,首先在人工气候室中研究了几种不同污秽度的绝缘子在不同湿度下的放电现象,根据放电紫外图像特征将放电分为两个典型阶段,通过对放电视频信号的分析并结合图像处理算法提取了平稳紫外光斑面积、间歇性紫外光斑面积以及间歇性紫外光斑重复次数三个特征参数来表征其放电,得到了上述参数与湿度和污秽度之间的关系曲线,研究结果将为基于紫外成像法评估污秽状态奠定基础。

Study on insulator contaminant discharge characteristics based on ultraviolet imaging

Discharge will occur along the polluted insulator surface and it will radiate the ultraviolet,in this paper,a method for contamination condition evaluation based on the solar-blind ultraviolet imaging was proposed.Firstly,the discharge phenomenon of different pollution degrees insulators under different humidity had been observed and researched in the artificial climate chamber,according to the UV images character,the discharge was separated into two typical stages,then,three parameters were extracted with video analysis and image processing algorithm to characterize the discharge,and the three parameters were as follows: the area of stable and intermittent UV facula,the repetition of intermittent UV facula,and the correlation curves of the parameters with the humidity and contamination were obtained,the research results will provide experiment basis for the contamination condition evaluation.