县级电网配电线路防雷技术分析及过电压保护器改进

发布时间：2018-06-20 14:30

本文选题：配电线路 + 感应雷过电压　；参考：《华北电力大学》2014年硕士论文

【摘要】：配电线路承担着向各电力用户输送电能的任务,配电线路的故障将导致电力系统供电可靠性和稳定性受到严重影响。诸暨市地处浙江省中北部,人口众多,工商业分布密集,在2013年中国最富有的县级市排名第二位。为保障诸暨地区生活生产用电,该地区10千伏配电网规模庞大。据浙江省气象局统计,诸暨市供电公司配电网所处地理位置诸暨市的落雷密度位居全省前列,是全省雷害最严重的地区,年雷暴日达到40以上,最高年份接近50。因配电网绝缘水平较低,线路运行环境复杂,防雷措施不完善,该地区配网运行可靠性受雷害影响严重。因此,对诸暨地区配电线路防雷技术进行分析,提出有效改进措施是该地区供电系统提升供电可靠性的工作重点。 1.本文通过对诸暨市电网近年来的雷害情况相关资料进行雷害分布和规律统计分析。同时对该地区杆塔接地电阻、杆塔结构参数、线路参数和所在地区土壤电阻率进行了测量。最后对该地区配网线路雷击跳闸率高的原因进行分析总结。 2.10kV配电线路发生的雷害事故大部分是由感应雷过电压造成的。本文通过理论分析计算,对诸暨地区配电线路感应雷过电压进行了计算并得出结论。最终给出避雷器安装方式优化建议。 3.利用技术外委模式,使用电磁暂态计算程序EMTP-ATP建立了10kV配电线路仿真对计算模型,分别对雷击杆塔顶和雷击导线两种情况的线路耐雷水平进行了仿真计算,通过仿真结果进一步给出诸暨地区避雷器安装方式合理建议。 4.进一步通过仿真,对过电压保护器性能分析。并针对现有过电压保护器羊角电极容易造成外间隙距离误差的情况,对其进行改进,将羊角电极改造成为了环形电极。优化了过电压保护器安装流程,提升了安装速度,减少因安装工艺而导致的羊角电极间隙距离的误差发生几率。
[Abstract]:The distribution line is responsible for transmitting electric energy to the power users. The failure of the distribution line will seriously affect the reliability and stability of the power supply system. Located in central and northern Zhejiang Province, Zhuji has a large population and dense industrial and commercial distribution, ranking second among China's richest county-level cities in 2013. In order to protect Zhuji area life production electricity, this area 10 kV distribution network scale is huge. According to the statistics of Zhejiang Meteorological Bureau, Zhuji power supply company distribution network is located in the geographical position of Zhuji City, which has the highest lightning drop density in the province, and is the most serious area of the province, with annual thunderstorm days reaching more than 40 days and the highest year approaching 50%. Due to the low insulation level of distribution network, complex operation environment and imperfect lightning protection measures, the reliability of distribution network in this area is seriously affected by lightning damage. Therefore, the lightning protection technology of distribution line in Zhuji area is analyzed, and the effective improvement measures are put forward to improve the reliability of power supply system in this area. 1. In this paper, the distribution and regularity of lightning damage in Zhuji power grid in recent years are analyzed. At the same time, the grounding resistance of the tower, the structural parameters of the tower, the line parameters and the soil resistivity in the area were measured. Finally, the causes of high lightning tripping rate of distribution lines in this area are analyzed and summarized. Most of the lightning damage accidents on 2.10 kV distribution lines are caused by induced lightning overvoltage. In this paper, the induced lightning overvoltage of distribution lines in Zhuji area is calculated by theoretical analysis and calculation, and a conclusion is drawn. Finally, the optimal installation mode of arrester is suggested. 3. Using EMTP-ATP, a simulation calculation model of 10 kV distribution line is established by using the EMTP-ATP program. The lightning resistance level of the transmission line is simulated in the case of the top of the lightning tower and the lightning strike wire, respectively. Through the simulation result, the reasonable suggestion of installation mode of arrester in Zhuji area is given. 4. Furthermore, the performance of the overvoltage protector is analyzed by simulation. Aiming at the situation that the current overvoltage protector can easily cause the distance error of the outer gap, it is improved to transform the horn electrode into a ring electrode. The installation process of overvoltage protector is optimized, the installation speed is increased, and the error probability of the gap distance between the sheep-angle electrodes caused by the installation process is reduced.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM863

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