基于变电站避雷器事故接地研究

Research on the Grounding Accident of Substation Arrester

针对某变电站雷击导致避雷器烧毁事故,通过现场调研测量接地电阻值及软件仿真分析,得出该变电站事故的主要原因是雷电反击。同时提出线路避雷器并接防雷电容器及对避雷针、进线终端杆塔及出线首端杆塔进行局部接地冲击优化,并采用电磁暂态仿真软件ATP进行仿真验证。仿真结果表明:该两项措施能有效降低雷电过电压陡度及幅值,能起到较好的防雷效果。该研究不仅能够提高变电站的供电可靠性,同时能够为同类型变电站改造及建设提供相应的工程实例,具有一定的借鉴意义。

Aiming at the burning accident of lightning arrester in a substation due to the lightning strike,through ground investigation and measurement of grounding resistance value and software simulation analysis,it is concluded that the main cause of the substation accident is lightning counterattack.At the same time,it is proposed that the line arrester is connected in parallel with the lightning protection capacitor,the local grounding impact is optimized for the lightning rod,the incoming terminal tower and the outlet end tower,and the electromagnetic transient simulation software ATP is used for simulation verification.The simulation results show that the two measures can effectively reduce the steepness and amplitude of lightning overvoltage,and can play a better lightning protection effect.The study can not only improve the power supply reliability of the substation,but also provide the corresponding engineering examples for the transformation and construction of the same type of substation,which has certain reference significance.