摘要
为研究引流法和绝缘间隔法对临近厂房线路雷电过电压的防护,建立3种厂房及临近配电线路过电压防护模型,分析了10 kV配电线路与临近厂房接地网间距、土壤电阻率和雷电流幅值对临近厂房线路雷电过电压的影响,并对比了引流法和绝缘间隔法的防护效果。研究结果表明:装设外延引线、敷设垂直接地体和装设隔离带都能有效地降低配电线路过电压,装设外延引线的降压效果最好,降压效率稳定在20%以上;配电线路与临近厂房接地网间距和土壤电阻率对防护后的降压效率有很大影响,但随雷电流幅值的增大,降压效率变化不大。研究结果可为实际雷击配电线路过电压防护提供参考。
In order to study the lightning overvoltage protection of adjacent power house lines by current⁃inducing method and insulation interval method,three overvoltage protection models of power house and adjacent distribution lines were established.The effects of the distance between the 10 kV distribution line and the grounding grid of the adjacent plant,soil resistivity and lightning current amplitude on the lightning overvoltage of the adjacent plant line were analyzed.Moreover,the protective effects of current⁃inducing method and insulation interval method were compared.Simulation results indicate that the overvoltage of distribution line can be effectively reduced by installing extended grounding line,vertical grounding electrode and isolation belt.The effect of installing extended grounding line is the most significant with voltage reduction efficiency of 20%.The distance between grounding grids of distribution lines and factory and soil resistivity have a great effect on the overvoltage of transmission line.The voltage reduction efficiency varies little with the increasing lightning current.The research results can provide reference for overvoltage protection of actual lightning strike distribution lines.
作者
张凯
吴晓东
代佰华
毛惠卿
咸日常
ZHANG Kai;WU Xiaodong;DAI Baihua;MAO Huiqing;XIAN Richang(State Grid Binzhou Power Supply Company,Binzhou 256600,China;Electrical and Electronic College,Shandong University of Technology,Zibo 255000,China)
出处
《山东电力技术》
2022年第11期7-12,共6页
Shandong Electric Power
基金
国网山东省电力公司科技项目“同塔多回配电线路雷电防护技术措施研究及应用”(520615210001)。
关键词
引流法
绝缘间隔法
雷电过电压
过电压防护
current⁃inducing method
insulation interval method
lightning overvoltage
overvoltage protection
