【摘要】 针对山西某110 k V变电站主变压器被雷电打坏的事故,分析出事故原因主要是35 k V线路进线段保护不完善,雷电波侵入所致。在分析了35 k V线路进线段杆塔接地电阻高、串联间隙金属氧化物避雷器不动作等防雷隐患以及杆塔塔顶安装避雷针保护误区的基础上,提出了对杆塔的接地装置进行改造,使用无间隙线路型金属氧化物避雷器保护,更换"零值"和"低值"绝缘子以及拆除杆塔塔顶避雷针这些进线段完善措施。通过上述改造之后,消除了该线路进线段的防雷隐患及误区,提高了供电可靠性。更多还原

【Abstract】 In view of a lightning damage accident of main transformer in Shanxi 110 k V substation,the main causes are analyzed, and the imperfect protection for 35 k V inlet lines led to lightning invasion. Based on the analysis of some flaws and errors in the 35 k V inlet lines, such as, high value of grounding resistance, failure of MOA with series gap and installation of lightning rod on top of tower,some reforming measures are proposed in this paper. For example, the tower grounding devices are reformed; a line-type of MOA without series gap is used; the "zero value" and "low value" insulators are replaced and the lightning rods on top of tower are removed. After implementing the above measures,the lightning hazard is eliminated and the reliability of power supply is improved.更多还原