摘要
穿刺型避雷器是目前10kV架空线路使用数量最多的避雷器类型,其安装位置及安装密度直接影响线路的防雷效果。本文通过实验及仿真研究穿刺型避雷器的最优安装配置方式:结合P—15针式、PS—20柱式两种典型10kV线路绝缘子,开展雷电冲击放电实验工作,研究安装位置对放电路径的影响;基于ATP-EMTP软件建立感应雷过电压计算模型,分析不同避雷器安装密度下的感应雷耐雷水平变化情况。研究结果表明,避雷器的穿刺电极中轴线到绝缘子中轴线的距离不得低于300mm,对应的避雷器外串联空气间隙宜调整为120mm。建议在安装避雷器的同时将绝缘子更换为PS—20柱式绝缘子,安装密度以隔基安装三相为宜。实际线路运行效果验证了仿真结论,按照上述原则改造后的线路实际雷击跳闸率下降75%左右。
Piercing arrester is the most used type of lightning arrester for 10kV overhead lines.Its installation location and installation density directly affect the lightning protection effect of the line.Therefore,this paper studies the optimal installation and configuration of the piercing arrester through experiments and simulation.Combined with P—15 pin type and PS—20 post type two typical 10kV line insulators,lightning impulse discharge experiment is carried out to study the effect of installation position on discharge path.Based on ATP-EMTP software,the calculation model of induced lightning overvoltage is established,and the variation of lightning withstand level under different installation densities of lightning arresters is analyzed.The results show that the distance between the central axis of the piercing electrode and the central axis of the insulator should not be less than 300 mm,and the air gap in series outside the arrester should be adjusted to 120 mm.It is suggested that the insulator should be replaced with PS—20 post insulator while installing arrester,and the installation density should be separate one base pole.The actual line operation verifies the simulation conclusion.According to the above principles,the actual lightning trip rate of the reconstructed line decreases by about 75%.
作者
梁开旺
冯珊
LIANG Kaiwang;FENG Shan(Zhaotong Power Supply Company of Yunnan Power Grid Co.,Ltd,Zhaotong,Yunnan 657000)
出处
《电气技术》
2022年第4期102-108,共7页
Electrical Engineering
基金
云南电网有限责任公司重点科技项目(0507002019030101SC00097)。
关键词
穿刺型避雷器
安装配置方式
放电路径
感应雷
安装密度
piercing arrester
installation and configuration mode
discharge path
induced lightning
installation density
