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| 500kV输电线路防雷分析及防范措施研究 摘 要 我国经济的发展越来越快，城市规模越来越大，要保证各家各户的基本生活状态，电力系统就显得尤为可贵，更重要的是我国的经济重心处于我国的沿海地区，但是在沿海地区我国的电量用量远超电力的产量，对此我国采用了“西电东输”等大规模输电行为来弥补这一缺口，但是在输电过程中又有各种各样的问题浮现，最主要的问题就是雷击事故的发生，这将导致人民的日常生活受到威胁，国家的发展受到阻碍，所以尽可能地在输电过程中减少雷击事故的发生成了输电线路保护的重中之重。 为保障人们的用电需求，输配电网络的建设至关重要。500kV输电线路又承担了我国输电任务中的主要责任，在一些高山、荒地中输电线路又受雷击危害，所以本论文主要通过对500kV高压输电线路综合防雷系统设计，全面剖析高压输电网络设计及运行中如何提高500kV输电线路防雷水平，科学有效地减少输电线路雷击跳闸事故，保障高压电网安全可靠的运行，提高供电的可靠性。在实际生活中，雷击输电线路是导致电网及电力系统发生故障的最主要原因之一。相关统计研究显示，雷击导致断路器发生跳闸的现象十分常见，特别是山区输电线路，受到地形的影响，雷击跳闸率比普通地区高很多。雷击跳闸导致线路故障的次数占总故障次数的 40% ～ 70%，所以采取有效的措施保障电力系统稳定运行势在必行。 本文主要是在500kV的输电线路防雷分析及防范措施方面进行研究，主要了解我国目前为止遇到的雷击事故的类型及所带来的危害和对我国目前为止几个重大输电线路中雷击跳闸率和雷击故障率进行解析，对一些地区防雷措施的方案可行性分析。 关键词：雷击跳闸率，雷击故障率，防雷系统。 ABSTRACT The power system is particularly valuable to ensure the basic living conditions of each household. More importantly, the economic center of our country is located in the coastal areas of our country, but in the coastal areas, China uses large-scale transmission such as "West-East Power Transmission" to make up for this gap, but in the transmission process, there are various problems, the most important problem is the occurrence of lightning strikes, which will lead to the daily life of the people being threatened and the development of the country being hindered, Therefore, as far as possible in the transmission process to reduce the occurrence of lightning accidents has become the most important transmission line protection. In order to ensure people's demand for electricity, the construction of transmission and distribution network is very important. The transmission line of 500 kV has assumed the main responsibility in the transmission task of our country, and the transmission line is damaged by lightning strike in some mountains and wasteland. Therefore, this paper mainly analyzes how to improve the lightning protection level of 500 kV transmission lines in the design and operation of 500 high voltage transmission lines, scientifically and effectively reduce the lightning tripping accidents, ensure the safe and reliable operation of high voltage power grid, and improve the reliability of power supply. In real life, lightning transmission line is one of the main causes of power grid and power system failure. The related statistical research shows that the phenomenon of circuit breaker tripping caused by lightning strike is very common, especially in mountain transmission lines, which is affected by topography, and the lightning tripping rate is much higher than that in ordinary areas. Because the number of line faults caused by lightning tripping accounts for 40%~70% of the total number of faults, it is imperative to take effective measures to ensure the stable operation of power system. This paper mainly studies the lightning protection analysis and preventive measures of 500 kV transmission lines. This paper mainly understands the types and hazards of lightning accidents encountered in China so far and analyzes the lightning tripping rate and lightning failure rate in several major transmission lines so far, and analyzes the feasibility of lightning protection measures in some areas. Keywords: lightning tripping rate, lightning failure rate, lightning protection system. 目 录 第一章绪论 1页 1.1课题的研究背景 1页 1.2国内外发展现状 1页 1.3本文的研究内容与方法 6页 第二章500kV 输电线路雷害事故的特点和类型 7页 2.1 500kV 输电线路雷害事故的类型 7页 2.2 500kV 输电线路雷害事故的特点 8页 第三章 500kV输电线路防雷措施优缺点分析 9页 3.1 500kV输电线路防雷措施类型及优缺点分析 9页 第四章 输电线路防雷可行性研究与改进方案 11页 4.1 输电线路防雷可行性研究及改进措施 11页 第五章 总结与展望 12页 5.1 总结 12页 5.2 展望 13页 参考文献 13页 致谢 |
