【作者】 何金武；

【导师】 刘渝根；

【作者基本信息】 重庆大学 ， 电气工程， 2002， 硕士

【摘要】 绵阳电业局有很多是为众多重要军工科研生产单位提供供电的35kV线路，线路走廊往往多为山区，所经地区地形情况十分复杂，土壤电阻率也较高。线路防雷措施较为薄弱，由于历史原因部分35kV线路还不是全线架设避雷线。据近几年的运行数据表明雷击35kV线路造成的电力系统运行事故屡有发生，严重影响我局的安全生产。因此结合绵阳电业局35kV线路实际情况研究提高35kV线路综合防雷措施具有非常重要的工程意义。本论文所研究的主要内容就是通过收集、总结我局35kV线路防雷运行资料，分析35kV线路防雷现况，并以我局典型的游仙分局35kV魏玉线路为研究对象，通过对该线路每基杆塔的现场实测数据来利用波过程理论建立数值计算模型。在考虑众多影响因素的基础上，对雷击35kV线路时雷电过电压进行数值计算，通过大量的数值模拟计算，研究如何提高其耐雷水平，特别是研究线路型避雷器经济合理的使用，以及降低雷击跳闸率的综合处理方法。通过研究发现，目前由于绵阳局35kV线路的特殊性，35kV线路普遍存在采用传统的防雷措施线路耐雷水平不高、雷击跳闸率偏高、运行维护也较为困难等问题，难以满足生产上的防雷要求，需对现行线路进行防雷综合措施的处理。处理方法包括加装避雷线、尽量减低线路杆塔接地电阻值、消弧线圈的合理使用和采用线路型避雷器。研究表明仅在35kV魏玉线路易击段杆塔上加装线路型避雷器后可提高各种情况下的线路耐雷水平2至4倍，并可大大降低线路雷击跳闸率。论文中还对杆塔接地电阻值大小变化和杆塔档距的大小变化对线路型避雷器使用的效果进行了研究。论文最后还对绵阳局今后防雷工作的开展，提高绵阳局线路防雷运行水平提出了建议和经济合理的方案。更多还原

【Abstract】 In the substation of Mianyang, a majority of 35kV lines power the military plants for scientific research or manufacture. For the line corridor was a mountainous area with complex landform and high soil resistivity, the line lightning protection measure was weak. And for history reasons some 35kV lines were not all spanned with lightning conductor. The operation data in recent years reveals that the repeatedly accidents which caused by lightning striking 35kV lines heavily affected the safety of our manufacture. So it was worth studying synthetic lightning protection measures on demonstration of the situation of the Mianyan Bureau’s 35kV lines.On the basis of collecting and summarizing the lightning protection data of our 35kV lines, this paper mainly analyzed the lightning protection status of 35kV line. With the demonstration of 35kV line of Youxian substation, it built a numeral value calculation model of on-line data of each pole. In terms of many factors, it studied on how to improve lightning withstand level, especially on how to use MOA economically and reasonably, and on the synthetic measures to decrease the lightning tripping outrage.It is found that, for the specialty of our 35kV lines, we should adopt synthetic lightning protection measures of power lines as the traditional measure could hardly keep up with the lightning protection requirement for its low line lightning protection level, high stripping outrage and bad maintenance. These measures include installation of lightning lines, decrease of the tower grounding resistance as far as possible, the reasonable use of arc suppressing coils and adoption of arresters. The investigation reveals that, the adoption of MOA on segments of 35kV Weiyu lines apt to lighting strike would improve the lightning withstand level to 2-4 times, and would heavily reduce the stripping outrage. This paper also discussed the influence of variation of tower grounding resistance or distance between towers to the effect of MOA. It also put forward feasible suggestion and scheme for our lightning protection work.更多还原