220kV同塔双回铁路牵引站供电线路防雷问题及改进策略研究

Research on Lightning Protection of 220 kV Power Supply Lines of Doublecircuit Railway Traction Station on the Same Tower and Improvement Strategy

针对220 kV同塔双回铁路牵引站供电线路自投运以来频繁发生雷击跳闸问题,总结分析跳闸原因,结合线路已有防雷措施,进行有针对性的改进。将闲置导线改造为耦合地线,并利用电磁暂态仿真软件ATP/EMTP计算杆塔反击耐雷水平,确定对上相导线进行改造的最佳方式;采取差异化防雷策略,优化线路避雷器配置方式,提高双回线路防雷击同时跳闸能力;调整跳线与铁塔横担空气间隙距离以满足运行要求,同时结合防风需要,增加跳线串或防风偏绝缘子;对线路接地电阻进行普查,高土壤电阻率及高地闪密度地区杆塔接地装置优先进行降阻改造。通过采取上述综合防雷、差异化防雷改造措施,220 kV同塔双回铁路牵引站供电线路的防雷性能将得到极大提升。

Aiming at the problem of frequent lightning tripping of 220 kV power supply lines of double-circuit railway trac-tion station on the same tower,reason for tripping was summarized and analyzed and pertinent improvement was made com-bining existing lightning protection measures.Idle conductors were transformed into coupling grounding wires and electro-magnetic transient simulation software ATP/EMTP was used for working out lightning back-flashover level of the tower so as to determine optimal way to transform the upper phase conductor.Differentiation lightning protection strategy was used, configuration way of line arresters was optimized and simultaneous tripping ability to prevent lightning of double-circuit lines were improved.Air gap distance between jumper wires and tower cross arm was adjusted to meet operational demand and jumper wire strings or windage protection insulators were increased considering of wind protection requirement.Grounding resistance of lines was generally surveyed and grounding devices of the tower in those areas with high earth resistivity and high ground flash density were preferentially transformed for reducing resistance.By means of using above comprehensive transformation measures for lightning protection and differentiation lightning protection,performance of lightning protec-tion of 220 kV power supply lines of double-circuit railway traction station on the same tower might be greatly improved.