基于紫外图像信息提取的离散液滴参数对复合绝缘子沿面放电特征的影响

Effect of Discrete Water Droplet on Surface Discharge of Polymer Insulator Based on Characteristic Extration of Discharge UV Image

为提高污湿环境下输变电设备外绝缘运行可靠性,本文针对绝缘子运行期间离散液滴的形成和诱导的沿面放电闪络现象,基于图像处理、特征提取和定量指标的紫外图像信息提取技术对不同的液滴静态参数(位置、体积和电导率)下的沿面闪络放电过程进行分析。得到了液滴诱发绝缘子放电的变化过程以及绝缘子起始放电电压和闪络电压与液滴的位置、体积和电导率之间的变化规律。研究结果有助于进一步分析表面液滴在污闪过程中的作用机理,对电力系统的安全稳定运行具有重要意义。

To improve the operation reliability of the external insulator of transmission and transformer equipment in a polluted and wet environment and aiming at the phenomena,such as the formation of discrete water droplets and the induced surface flashover during the insulator operation,the process of surface flashover discharge under different droplet static parameters(e.g.,droplet location,volume,and conductivity)is analyzed using UV-imaging information extraction technique based on image processing,feature extraction,and quantitative indexes.The relationships among the process of discharge induced by discrete water droplets,the initial discharge voltage of the insulator,flashover voltage,and the different droplet static parameters are obtained.The research results are helpful for further investigation on the effect of surface water droplet on the flashover mechanism,which is of great significance for the safe and steady operation of power system.