贵州某35 kV变电站雷害事故分析与防雷改造

针对贵州某35 kV变电站雷击事故,介绍了该变电站的防雷保护现状,从变电站直击雷保护,线路侵入波保护等方面分析了雷害事故发生的原因,提出了防雷害事故的整改措施:降低杆塔冲击接地电阻;完善进线段保护,降低雷电侵入波幅值和陡度;使用性能较好的金属氧化物避雷器代替普通阀型避雷器。通过以上整改,消除了该变电站防雷保护的薄弱环节,提高了供电可靠性。

Analysis and Lightning Protection Reform Measures on Lighting Accident at a 35 kV Power Substation of Guizhou Province

In view of the lighting accident at a 35 kV power substation of Guizhou Province,the lighting protection situation of the power substation is introduced,causes of lighting accident such as direct lighting protection and lighting intruding wave protection are analized.The measures such as reducing tower impulse grounding resistance,improving the incomingline protection to lower the amplitude and the slope of the lighting invasion wave,and better performance zinc oxide surge arresters are used instead of normal valve-type surge arrester.Through above rectification,the bottleneck of the substation lightning protection has been eliminated,the power supply reliability has been improved.