500kV线路型避雷器雷击塔顶特性研究

Research on Characteristic of the Lightning Arrestr Thunderstrike of 500kV Line

选取雷击塔顶案例,通过计算,分析了在没有安装避雷器时、某相安装避雷器时、三相各自装设避雷器的情况下,杆塔耐雷水平的异同。从中得出结论:未安装避雷器时,各相均有发生闪络的可能性,某一相安装了避雷器后,能够很大程度上抬高临近杆塔的耐雷水平,三相均安装了避雷器之后,雷击不会造成安装避雷器杆塔的绝缘子发生闪络。但是当接地电阻值比较大时,避雷器吸收的能量也会比较大。

Based on the lightning tower as an example, through calculation, Compare the distinction of tower lightning tolerate level （ When the lightning arrester is not installed, A phase of installation of lightning arrester, Condition of three- phase are respectively installed arrester）, Come to a decision：Lightning arrester installed without context,each phase has flashover may. When a phase installed a lightning arrester, can effectively raise the lightning withstand level of the immi- nent tower, three-phase are respectively installed arrester, Lightning does not cause insulator flashover arrester tower, but when the grounding resistance value is very large, the lightning arrester absorbed energy is larger.