35 kV架空输电线路雷击故障分析及防雷保护研究  

35 kV Overhead Transmission Line Lightning Strike Fault Analysis and Lightning Protection Research

作　　者：李占宇 LI Zhanyu(State Grid Shandong Electric Power Company,Yucheng Power Supply Company,Yucheng 251200,China)

机构地区：[1]国网山东省电力公司禹城市供电公司,山东禹城251200

出　　处：《电工技术》2024年第7期195-202,222,共9页Electric Engineering

摘　　要：为提高禹城市35 kV架空输电线路耐雷水平,并研究雷击后避雷器温升及电势变化,选取典型线路和避雷器模型进行研究。首先采用电磁暂态计算程序EMTP-ATP建立相应的35 kV输电线路模型计算雷击输电线路塔顶或避雷线时线路的反击耐雷水平,分析差异化防雷策略对线路耐雷水平的影响。分析了架设避雷线、杆塔冲击接地电阻和避雷器选型等因素对于线路耐雷水平的影响。然后采用有限元仿真软件计算了雷击后避雷器的温升及电势变化。仿真结果表明,采用全线架设避雷线、降低杆塔接地电阻和合理安装线路避雷器都可提升35 kV输电线路的耐雷水平,杆塔接地电阻越大,采用架设避雷线和降低接地电阻提高耐雷水平效果越显著;雷击后,避雷器温度出现明显的稳定上升趋势,电势和电场呈现先快速上升后下降的趋势;采用合理安装避雷器方案对耐雷水平提升效果更显著,更具经济性。In order to improve the lightning withstand level of 35 kV overhead transmission lines in Yucheng City,and to study the temperature rise and potential changes of lightning arresters after lightning strikes,this study focuses on typical lines and arrester models.First the electromagnetic transient calculation program EMTP-ATP is used to establish the corresponding 35 kV transmission line model to calculate the lightning protection level of the line when the top of the transmission line tower or lightning protection line is struck by lightning,and analyze the impact of differentiated lightning protection strategy on line lightning protection level.The influence of factors such as the erection of lightning protection wire,tower impulse grounding resistance and the selection of lightning arrester on the lightning resistance level of the line is analyzed.Then finite element simulation software is used to calculate the temperature rise and electric potential change of the arrester after lightning strike.The results show that the lightning protection level of 35 kV transmission lines can be improved by adopting the whole line of lightning protection lines,reducing grounding resistance of the tower,and installing line lightning arresters.In addition,after a lightning strike,the arrester temperature shows a clear and stable upward trend,and electric potential and electric field show a rapid rise first and then a downward trend.Appropriately installing lightning arresters has a more significant effect on improving lightning resistance and is more economical.

关 键 词：35 kV架空输电线路 EMTP-ATP 架设避雷线 接地降阻 避雷器选型 

分 类 号：TM75[电气工程—电力系统及自动化]