110 kV同塔双回输电线路雷击过电压特征研究

Study on Lightning Overvoltage Characteristics of 110 kV Doublecircuit Transmission Line with the Same Tower

雷击容易造成同塔多回输电线路多回同跳故障,给电网造成较大冲击。同塔多回线路雷击分析与防护一直是电网研究的一个热点。以ATP-EMTP软件为分析工具,搭建了包含杆塔、输电线路、冲击接地电阻、雷电波的综合分析模型,对其中的冲击接地电阻与杆塔模型搭建进行了详细说明。通过仿真分析模型,研究了冲击接地电阻变化规律以及杆塔不同相别过电压分布规律,进一步分析了工频接地电阻、土壤电阻率、雷电流幅值、杆塔呼高等因素对横担雷击过电压大小的影响。

Lightning strike can easily cause multi-circuit transmission lines with the same tower and jump faults,which will cause great impact on the power grid. Lightning strike analysis and protection of multi-circuit lines in the same tower has always been a hot spot in power grid research. Using ATP-EMTP software as the analysis tool,a comprehensive analysis model including tower,transmission line,impulse grounding resistance and lightning wave is built,and the impact grounding resistance and tower model are described in detail. Through the simulation analysis model,the change law of impulse grounding resistance and the distribution of overvoltage in different phases of tower are studied,and the power frequency grounding resistance,soil resistance,lightning current amplitude and tower exhalation are further analyzed. The influence of higher factors on the overvoltage of cross lightning strike.