新密矿区35kV电网防雷计算分析

发布时间：2018-01-11 20:08

本文关键词：新密矿区35kV电网防雷计算分析　出处：《河南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：新密矿区供电网络中,35kV等级的供电系统担负着大部分煤矿的供电任务,因此必须保证其运行的安全性、稳定性和可靠性。但由于该地区35kV供电线路所经地区大部分为山区丘陵地带,地形比较复杂,地势起伏变化大,雷电活动频繁且强度大,土壤电阻率偏高,致使每年雷雨季节时,防雷成为雨季“三防”工作的重中之重,尽管采取了一部分防雷措施,但是效果并不理想,雷击造成生产和生活供电设施损害的事故常有发生,因此研究该地区35kV供电系统防雷技术和措施是十分必要的。本文依据35kV平申线路多年的防雷运行资料和整条线路实测的基本电气参数,在考虑地形地势、杆塔档距、杆塔接地电阻等因素对输电线路影响的基础上,建立雷击线路的仿真计算模型。在分析这些模型的基础上,首先研究总结了哪些因素会影响线路的耐雷水平和雷击跳闸率,然后重点研究线路在加装避雷线、避雷器以及改变杆塔冲击接地电阻前后,耐雷水平的变化情况,总结仿真结果,得出通过采取这些措施对降低雷击跳闸率是行之有效的。除了做线路防雷分析外,针对35kV变电站雷电侵入波的危害也进行了仿真分析,即考虑雷击杆塔时,雷电侵入波对变电站内主要电气设备的影响,还深入分析雷击点发生变化时,在改变进线段杆塔的冲击接地电阻情况下,雷电侵入波受影响的程度,为完善变电站的防雷提供了依据。通过仿真计算分析,总结了引起35kV平申线路雷击跳闸率高的主要因素,结合工程实际情况提出在易击杆塔上加装线路型避雷器,如有可能,尽可能全线架设避雷线,降低杆塔接地电阻等各项综合措施,以提高新密矿区35kV线路耐雷水平,降低雷击跳闸率。
[Abstract]:Xinmi coal mine power network, power supply system of 35kV grade is responsible for most of the coal supply tasks, it is necessary to ensure the safety, stability and reliability. But due to the 35kV power supply line in the area of the region mostly mountainous hilly areas, the terrain is more complex, the terrain changes, frequent lightning activity and high strength that year, high soil resistivity, thunderstorm season, lightning protection become a priority among priorities during the rainy season three work, despite a part of lightning protection measures, but the effect is not ideal, the production and life of the power supply facilities caused by lightning damage accidents often occur, so the research area of 35kV power supply system and lightning protection measures is very the necessary basic electrical parameters. On the basis of the lightning protection data line 35kV Pinchen years and the whole line is measured, considering the topography, tower span, bar The effect of tower grounding resistance of transmission line, establish the lightning simulation calculation model. Based on the analysis of these models, the thesis summarizes the factors which affect the line lightning withstand level and lightning trip rate, then focus on the line in the installation of lightning arrester and change line tower grounding the resistance changes before and after the lightning protection level, summarizing the simulation results obtained by these measures are effective to reduce the lightning trip rate. In addition to analysis of lightning protection for 35kV substation, lightning damage is analyzed, including the lightning, lightning invasion wave effect on the main electrical equipment in substation also, in-depth analysis of the lightning point changes, changes in the inlet line of tower impulse grounding resistance, lightning invasion wave is affected by the degree of improvement Provide the basis for substation lightning protection. Through simulation analysis, summarized the main factors causing 35kV Pinchen lightning trip out rate is high, according to the actual situation of engineering to install arresters in easy to hit the tower, if possible, as far as possible across the board set up bileixian, reducing tower grounding resistance and other comprehensive measures in order to improve the mining area of Xinmi 35kV, the lightning impulse withstand level, reduce the rate of lightning trip.

【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM863

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