Study on DC flashover characteristics of plastic sheds in small scale

3rd International Conference on Energy Engineering and Environmental Protection

能源学;生态环境科学

Liu, Hui^1 ; Zhang, Yang^1 ; Yao, Jinxia^1 ; Jia, Ran^1 ; Ma, Guoqing^1

State Grid Shandong Electric Power Research Institute, China^1

关键词: Dc flashovers;    Dry condition;    Flashover voltage;    Foreign object;    Insulation resistance;    Per unit length;    Small scale;    Surface conductivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/227/3/032028/pdf
DOI  :  10.1088/1755-1315/227/3/032028

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The statistics of tripping data of transmission lines show that external damage has become the main cause of transmission lines tripping. The foreign object cutting-out, which accounted for 61.8% of the total, was the most common external damage in transmission line. This paper focuses on the DC flashover characteristics of small-scale plastic sheds of greenhouses with distances of 1m and 2m. The results of the study showed that the surface of plastic sheds was less dirty and the average surface conductivity was lower. In the dry condition, it can be regarded as an insulator, and in the case of moisture, however, its insulation resistance is reduced to a megohm level. Under the electric field of 70 kV/m, no flashover occurred in both the wrinkled and the tiled plastic sheds. The flashover voltage per unit length of the wrinkled is about 15%-21% lower than that of the tiled, and wrinkled plastic sheds flash over more easily. As the pole pitch increases, the flashover voltage per unit length decreases, and the flashover voltage per unit length of both the wrinkled and the tiled is reduced by about 30%.