江苏省如皋地区110kV输电线路雷击跳闸率分析及防雷措施研究

发布时间：2018-06-04 01:45

本文选题：如皋地区 + 防雷性能　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：作为生产、输送、分配与消耗电能的系统,电力系统在国民经济与生产中起着极为重要的作用。输电网和配电网是电力系统中的重要组成部分,是连接发电厂和用户的纽带。雷击作为造成配电网供电可靠性下降的一个重要因素日趋得到重视。110kV输电线路在国家电能输送分配方面具有重要地位,保障输电线路的安全稳定运行、避免输电线路故障,是110kV输电线路运行维护单位的一个重要工作任务,也是值得研究的科学问题。江苏省是我国经济大省,其人口、建筑物和工业较为集中,用电量大,电网密集；同时由于江苏地处温带,雷电活动频仍,极易发生雷击事故。为深入讨论分析110kV杆塔的防雷性能,本文对江苏如皋地区110kV输电线路的数据进行了统计分析。考虑到现有的规程中采用的计算方法较为粗略,不能准确描述高频率雷电波下杆塔中的电磁暂态过程,本文对杆塔高频暂态建模进行了研究,主要做了如下工作：首先对背景资料及基础数据进行了整理。分析整理了江苏省地区地貌及雷电参数等数据、考虑到江苏地区雷暴日较多的特点,收集整理江苏地区110kV典型塔型参数及其接地情况、对杆塔高度数据、塔型布置结构、雷电典型参数、土壤电阻率等数据进行统计分析；然后首先研究了目前国内外主要的杆塔建模方法,并对这些方法的优缺点进行了比较分析。根据江苏如皋地区110kV输电线路典型杆塔数据,根据日本学者Hara提出的多波阻抗模型,建立了合理的雷电冲击下110kV典型杆塔多波阻抗模型；利用ATP-EMTP软件对杆塔的多波阻抗参数进行计算；研究了雷电过电压机理、雷电放电模型和雷击跳闸率计算方法；利用实际杆塔参数对雷击跳闸率进行了计算,并对影响雷击跳闸率的因素进行了分析。根据江苏如皋地区110kV输配电线路的防雷现状,发现输配电网在防雷措施和防雷设备上存在的缺陷和不足,提出改进措施。研究表明,接地电阻、呼高、档距及绝缘子串等参数均对雷击跳闸率产生不同程度的影响,其中接地电阻与呼高的影响最为明显。同时,对江苏如皋地区110kV线路防雷性能进行了评估,通过提高绝缘子串U50%、装设避雷器、减小接地电阻等方法,提高供电线路的耐雷水平。本文的研究内容对研究分析110kV的防雷性能有着指导作用,并能够将研究成果应用到未来对该地区110kV线路改造的方案指导上,具有较为明显的实用价值和较高的工程意义。
[Abstract]:As a system of production, transmission, distribution and consumption of electric energy, power system plays an extremely important role in national economy and production. Transmission network and distribution network are important components of power system and the link between power plant and users. Lightning stroke, as an important factor that causes the decrease of power supply reliability of distribution network, has been paid more and more attention to. 110kV transmission line plays an important role in the distribution of national power transmission, which ensures the safe and stable operation of transmission line and avoids the fault of transmission line. It is an important task of 110kV transmission line operation and maintenance unit, and it is also a scientific problem worth studying. Jiangsu Province is a large economic province in China, its population, buildings and industries are concentrated, electricity consumption is large, and power grid is dense. At the same time, because Jiangsu is located in the temperate zone and lightning activity is frequent, lightning accidents are easy to occur. In order to discuss and analyze the lightning protection performance of 110kV tower, the data of 110kV transmission line in Rugao area of Jiangsu province are analyzed statistically in this paper. Considering that the calculation methods used in the existing regulations are rather rough and can not accurately describe the electromagnetic transient process in the tower under high frequency lightning waves, the high frequency transient modeling of the tower is studied in this paper. The main work is as follows: firstly, the background data and basic data are sorted out. The data of geomorphology and lightning parameters in Jiangsu Province are analyzed and arranged. Considering the characteristics of more thunderstorm days in Jiangsu region, the typical tower parameters and grounding conditions of 110kV in Jiangsu are collected and sorted, and the tower height data and tower layout structure are analyzed. The typical lightning parameters, soil resistivity and other data are analyzed statistically. Then, the main methods of tower modeling at home and abroad are studied, and the advantages and disadvantages of these methods are compared and analyzed. Based on the typical tower data of 110kV transmission line in Rugao area, Jiangsu Province, and according to the multi-wave impedance model proposed by Japanese scholar Hara, a reasonable multi-wave impedance model of 110kV tower under lightning shock is established. The ATP-EMTP software is used to calculate the multi-wave impedance parameters of the tower, the mechanism of lightning overvoltage, the lightning discharge model and the calculation method of lightning tripping rate are studied, and the lightning tripping rate is calculated by using the actual tower parameters. The factors influencing the lightning tripping rate are analyzed. According to the lightning protection status of 110kV transmission and distribution line in Rugao area, Jiangsu Province, the defects and shortcomings of lightning protection measures and lightning protection equipment in transmission and distribution network are found, and the improvement measures are put forward. The results show that the parameters such as grounding resistance, call height, step distance and insulator string have different effects on lightning tripping rate, among which the influence of grounding resistance and call height is the most obvious. At the same time, the lightning protection performance of 110kV line in Rugao area of Jiangsu Province is evaluated. By improving U50 insulator string, installing lightning arrester and reducing grounding resistance, the lightning resistance level of power supply line is improved. The research content of this paper has the guiding function to study and analyze the lightning protection performance of 110kV, and can apply the research results to the plan guidance of 110kV line reconstruction in the future, which has obvious practical value and high engineering significance.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM863

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