雷击城轨杆塔对整流变电站的影响分析

Analysis on Impact of Lightning Urban Rail Tower on the Rectifier Substations

根据城轨供电系统的特点分析了雷击城轨整流变电站附近杆塔时对整流变电站的影响方式,认为与铁轨并联的均流线和接触网末端的绝缘配置会引起雷击杆塔时过电压入侵到整流变电站,而整流变电站避雷器接地散流效果和均压效果不好是引起整流变电站事故的主要原因。针对避雷器接地和均流线接地散流和均压不良设计了新的接地装置,并用ANSYS软件对比分析了新的接地装置和原有接地装置的接地性能,分析结果表明:新型接地装置的均压效果相对于原有接地装置的均压效果其最大地电位减小了28%,同时地电位分布的均匀度相对于原有接地装置也有了较大的提高,大大减小了雷电流通过避雷器入地时对附近设备的影响,进而减小了因雷击整流变电站附近杆塔使过雷电过电压入侵到整流变电站对整流变电站设备的影响。

Based on the characteristics of urban rail power system,the way of influence when Lightning the tower near the urban rail rectifier substation to the rectifier substation is analyzed, it is considered that lightning overvoltage will invasion into the rectifier substation caused by the flow lines with rails in parallel and the insulation configuration in the end of catenary,and the bad arrester grounding diffuser effect and bad grading effect of the rectifier substation is the main causes of the accidents, a new grounding devices is designed for the problems that the bad diffuser and grading of an＇ester grounding and current share line grounding, and the grounding performances of the new and original grounding devices is compared and analyzed,the analysis results show that compare new grounding devices to the original ones,the max ground potential decreased by 28% ,and the Ground potential distribution uniformity improved a lot compared to the original grounding devices,the influence on the nearby equipment is greatly reduced when the lightning current flow into the ground though lightning arrester,and then the influence of the lightning current which invaded into the rectifier substation caused by lightning strike at the towers near the urban rail rectifier substation to the equipments in the rectifier substation is reduced.