线路型避雷器在110kV玄石线的应用研究

以泸州110 kV玄石线为例,介绍了如何最大限度提高输电线路耐雷水平的方法:一分析线路的杆塔参数和地势,找出需要进行重点防护的地区;二通过理论分析和电磁暂态仿真,比较不同避雷器安装方式的防雷效果。分析了冲击接地电阻对耐雷水平的影响以及线路避雷器吸收的雷电放电能量,确定了线路型避雷器的参数要求。对玄石线110kV输电线路耐雷水平进行仿真计算,易击杆塔的耐雷水平可从76kA提高到410kA。因此,在特定区段合理安装线路型避雷器,大大提高了输电线路的耐雷水平。

Study on Application of Line Lightning Arrester on 110 kV Xuan-Shi Transmission Line

With an example of 110 kV Xuan-Shi transmission line of Lu-Zhou,it is detailed on how to select the ZnO arrester erecting position to improve the lightning withstanding level of transmission line.First,we should identify the need to focus on the protection area by analyzing the tower line parameters and the terrain.Second.through theoretical analysis and electromagnetic transient simulation,we could compare the lightning protection effects of different methods of installation arresters.Impact of impulse grounding resistance on lightning withstand level and the absorbed discharge energy of lines lightning arresters was analyzed in this paper,in this way the required ZnO arrester parameters were determined.Though the 110 kV Xuan-Shi lightning withstand level of transmission line simulation calculation,the lightning withstand level of tower,most likely subjected to thunder strike,can be increased from 76 kA to 410 kA.Therefore,installation of reasonable line arrester at specific line sections can significantly increase the lightning withstand level of transmission line.