实际电网330kV输电线路雷击跳闸率分析计算

Analysis and Calculation of Lightning Trip Rate of 330k V Transmission Lines in Actual Power Grid

输电线路的可靠运行是输电线路设计阶段需考虑的首要因素;而雷击又是造成输电线路故障的主要原因,因此对输电线路进行防雷性能评估就成为电力线路设计部门的重要任务。由于工频电压的存在,因电压叠加的结果,会降低线路的耐雷水平。在考虑工频电压影响时计算得到耐雷水平要比不考虑工频电压时计算得到的耐雷水平低一些。而且随着工频电压的升高,影响会相应增大。

Reliable operation of transmission lines is the first factor to be considered in the design phase of transmission lines;and lightning strikes are the main cause of transmission line failures.Therefore,evaluating lightning protection performance of transmission lines has become an important task for power line design departments.Because of the existence of power frequency voltage,the lightning resistance level of the line will be reduced due to the result of voltage superposition.When considering the influence of power frequency voltage,the calculated lightning resistance level is lower than that calculated without considering the power frequency voltage.And as the power frequency voltage increases,the impact will increase accordingly.