基于分形理论的闪络放电痕迹分析方法研究  

Investigation of Approach to Analyze the Tracking Property After Flashover Based on Fractal Theory

作　　者：师伟 孙景文 任敬国 乔木 戈宁 SHI Wei;SUN Jingwen;REN Jingguo;QIAO Mu;GE Ning(State Grid Shandong Electric Power Company Research Institute,Jinan 250003,China;State Grid Shandong Electric Power Company,Jinan 250001,China)

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250003 [2]国网山东省电力公司,山东济南250001

出　　处：《山东电力技术》2024年第12期84-91,共8页Shandong Electric Power

基　　金：国家电网公司总部科技项目“基于光纤传像的GIS内部多谱段光学成像关键技术研究”(5500-202216134A-1-1-ZN)。

摘　　要：绝缘子连续闪络会导致绝缘子表面出现碳化痕迹,导致绝缘劣化。对绝缘子表面碳迹的研究有助于解绝缘子长期运行时的闪络特性。文中通过对绝缘子进行直流闪络实验,获取连续放电后的碳化痕迹图像。基于分形理论,采用改进的差分盒计数法(improved differential box-counting method,IDBCM)对这些图像进行分析,对于边缘被切割尺寸框覆盖的矩形图像,在计数过程中提出加权项,所提出的方法可以估计绝缘子表面的放电传播特性和劣化特性。由于考虑了碳化痕迹图像的颜色深度,IDBCM在图像预处理和评估绝缘子劣化性能方面表现出了比传统盒计数方法更大的优势。该图像分析方法在处理碳化痕迹时具有通用性,可为闪络电压提供附加信息,包括闪络时间、电压大小、工况等。为今后研究放电机理及相应的绝缘子劣化问题提供了一种方法。Successive flashover would result in carbonized tracking on the insulator surface and cause deterioration to the insulation.Thus,investigating the tracking can be beneficial in understanding flashover characteristics during long-term operations.In this paper,the DC flashover was operated on the insulator,and the image of the track was captured after successive discharges.An improved differential box-counting method(IDBCM)was applied to analyze these images based on fractal theory.Weighted items were suggested during the counting procedure for rectangle images with margins covered by cut-size boxes.It is claimed that the suggested method could estimate the discharge propagation property and deterioration characteristics on the insulator surface.Moreover,IDBCM showed advantages in image pre-processing and deterioration properties revealed compared to the traditional box-counting method attributing to the consideration of color depth.This image analysis method shows universality in dealing with tracking images.It can provide additional information for flashover voltage,including flashover time,voltage size,operating conditions,etc.This paper suggested a potential approach for the investigation of the discharge mechanism and corresponding deterioration in future research.

关 键 词：分形维数 闪络 差分盒计数法 环氧树脂 

分 类 号：TM75[电气工程—电力系统及自动化]