计及距离修正的电力设备紫外放电区域提取研究  

Research on extraction of UV discharge location of power equipment and correction of metered distance

作　　者：马宏伟 崔昊杨 郭文诚 霍思佳 葛晨航 MA Hongwei;CUI Haoyang;GUO Wencheng;HUO Sijia;GE Chenhang(School of Electronics and Information Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力学院电子与信息工程学院

出　　处：《现代电子技术》2019年第23期77-80,85,共5页Modern Electronics Technique

基　　金：国家自然科学基金资助项目(61107081);国家自然科学基金资助项目(11647023);上海市科委地方院校能力建设项目资助课题(15110500900,14110500900);上海市自然科学基金面上项目(17ZR1411500)~~

摘　　要：紫外局部放电检测是电力设备绝缘缺陷带电检测中的一种新兴技术手段,通常用光子数表征放电强度,然而该参量受观测距离和探测器增益等外部环境的影响,探测结果往往存在很大误差。为更准确地对紫外放电进行量化分析,提出基于改进GAC模型的有效放电区域提取方法。通过对LBF模型的能量函数进行归一化处理以代替原来GAC模型的边缘停止函数,实现对紫外图谱放电区域的提取;采用前景信息像素点统计的方式获取放电光斑面积参数;最后通过光斑面积的距离修正实验验证所提方法的可行性,结果表明该方法不仅可以快速定位放电点,而且能准确地对紫外放电进行量化分析,具有良好的自动化性能。As an emerging technique,ultraviolet partial discharge detection is widely used to execute live detection of insulation defects of power equipments. The photon number is usually used to characterize the intensity of discharging. However,it is inclined to be influenced by the external environment,including the gain of the detecting instrument and observation distance,so a great error exists in the detecting accuracy. To eliminate the detection error and analyze the UV discharge quantitatively,the method of effective discharge area extraction based on improved GAC model is proposed in this paper. The energy function of LBF model is normalized to substitute the edge stopping function of GAC model,so as to extract the discharge region of UV spectrums. Then the discharge light-spot area is obtained by counting the foreground information pixel points to discriminate the seriousness of the ultraviolet fault image. The feasibility of the proposed method was verified by the distance correction experiment of the light-spot area. The results show that the method can not only locate the discharge point quickly,but also quantify the UV discharge accurately. Therefore,it has perfect automatic detection performance.

关 键 词：紫外成像 电晕放电 GAC模型 LBF模型 特征提取 光斑面积修正 

分 类 号：TN23-34[电子电信—物理电子学]