GIS局部放电光信号检测技术及光学图像诊断方法  

Optical Signal Detection Technology and Optical Image Diagnostic Method of Partial Discharge in GIS

作　　者：李泽 钱勇[1] 刘伟 臧奕茗 盛戈皞[1] 江秀臣[1] Li Ze;Qian Yong;Liu Wei;Zang Yiming;Sheng Gehao;Jiang Xiuchen(Department of Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Grid Shanghai Electric Power Research Institute,Shanghai 200437,China;Key Laboratory for Sulfur Hexafluoride Gas Analysis and Purification of SGCC,State Grid Anhui Electric Power Research Institute,Hefei 230022,China)

机构地区：[1]上海交通大学电气工程系,上海200240 [2]国网上海市电力公司电力科学研究院,上海200437 [3]六氟化硫气体特性分析与净化处理技术国网公司重点实验室、国网安徽省电力有限公司电力科学研究院,合肥230022

出　　处：《电工技术学报》2025年第1期253-263,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(62075045)。

摘　　要：光测法是一种有效的局部放电检测技术。为研究典型局部放电的光学特征和光学图像诊断方法,首先搭建气体绝缘局部放电光电联合检测实验平台,实现光信号和电信号的同步采集;然后分别采用导光柱法和荧光光纤法对SF_(6)气体中典型放电光信号进行实验测量和统计分析,对比研究两种光学检测方法的放电特征参数,包括起始放电电压、相位分布、脉冲幅值和数量等;最后,利用导光柱采集的典型局部放电信号,提出一种基于金字塔梯度直方图(PHOG)特征的局部放电光学图像故障诊断方法。结果显示该模型诊断准确率达90.4%,验证了基于导光柱的局部放电光学检测与诊断的可靠性。Partial discharge(PD)detection and fault diagnosis are of great significance to the stable operation of GIS.The optical detection method is a new method for measuring and analyzing PD signals,which has received wide attention due to its high detection confidence and strong anti-interference.The light guide rod is a kind of optical sensor with high transmittance,high hardness,and easy to seal,which can be used for PD detection in GIS.Currently,there is a lack of research on the characteristics of PD optical pulse in GIS using a light guide rod.In PD fault diagnosis,fewer studies based on optical data,especially optical images.Therefore,in this paper,optical detection and image diagnostic research of PD in GIS is carried out using the light guide rod.Firstly,a test platform for electrical and optical detection of PD in GIS was built,achieving synchronous collection of optical and current signals.The typical PD defects were designed.Then,the PD optical signals were measured by the light guide rod and the fluorescent fiber.After that,the optical parameters of the two methods were compared and analyzed,including the PD inception voltage,the phase distribution,the maximum amplitude of the optical pulse,and the average amplitude and number of the optical pulse.For optical image fault diagnosis,the PRPS patterns of optical PDs were constructed based on the data collected by the light guide rod.The pyramid histogram of oriented gradients(PHOG)features of the optical images were extracted and input into the classifier of the beetle antennae search(BAS)and support vector machine(SVM)for fault diagnosis.Finally,the method in this paper was compared with other image feature extractions and support vector machine optimization algorithms.The conclusions are as follows:(1)The light guide rod can measure the PD in GIS and reflect the signal characteristics of typical PDs.The discharge phase distribution of the optical signals is similar to that of the discharge phase distribution collected by the pulse current method,and the disc

关 键 词：光学局部放电 导光柱 金字塔梯度直方图 天牛须搜索算法 支持向量机 

分 类 号：TM85[电气工程—高电压与绝缘技术]