闽侯地区输电线路防雷技术研究

发布时间：2018-07-29 18:01

【摘要】：在电能应用广泛的今天,只有完整可靠的电力系统才能保证电能输送的稳定,最大限度地促进地方经济的发展,满足人民生活水平的需求。输电线路作为电力系统的大动脉,担负着将电能输送到四面八方的重要任务。回顾电网发展不难看出,在气象条件日趋恶劣的大背景下,雷击使电网无法正常运行的情况日益严重,特别是对高电压等级的输电线路伤害尤为突出,时常出现同塔多回线路或单回线路多相同时跳闸的严重事故。面对严峻的气象条件及雷击跳闸情况,为减少电力线路的雷击事故,国内外采取了各种综合防雷措施,提高电网稳定运行和供电可靠性。闽侯县地处福州市西南部,输电线路绝大部分处于山区和树林茂密区,周围环境相当恶劣。相关数据显示,郊外线路因地面附近的空间电场受地形等影响,其绕击率约为平原线路的3倍,或相当于保护角增大8。,因此,采取切实有效的输电线路防雷措施,已经成为确保输电线路安全运行,可靠供电的当务之急。本次研究采用由分析雷闪理论入手,配合已实践的防雷项目,阐述我国输电线路中常用的几种防雷方法,以实践运行的数据统计分析为基础,结合地形地貌特征以及气候坏境特点,并对近几年来的防雷改造工程进行跟踪总结,力求得出闽侯地区电网输电线路发生雷击的特点和规律,在设计、建设和管理方面提出新的方法和建议,最终达到运用多种防雷技术,使线路得到全线保护的目标。
[Abstract]:Only a complete and reliable power system can guarantee the stability of power transmission, promote the development of local economy to the maximum extent, and meet the needs of people's living standard. As the main artery of power system, transmission line takes on the important task of transmitting electric energy in all directions. Looking back at the development of the power grid, it is not difficult to see that, against the background of the worsening weather conditions, the situation that lightning strikes make the power grid unable to operate normally is becoming increasingly serious, especially in the case of transmission lines with high voltage levels, There are often serious tripping accidents when the same tower multi-circuit line or single circuit line is the same. In the face of severe meteorological conditions and lightning tripping, in order to reduce lightning strike accidents on power lines, various comprehensive lightning protection measures have been adopted at home and abroad to improve the stable operation of power grid and the reliability of power supply. Minhou County is located in the southwest of Fuzhou. Most of the transmission lines are located in mountainous and wooded areas, and the surrounding environment is very bad. The relevant data show that, because of the influence of terrain and other factors on the electric field near the ground, the surrounding impact rate of the suburban line is about three times of that of the plain line, or is equivalent to the increase of the protection angle by 8.0.Therefore, practical and effective lightning protection measures are taken for transmission lines. It has become an urgent task to ensure the safe operation and reliable power supply of transmission lines. Based on the analysis of lightning flashover theory and the lightning protection projects in practice, several lightning protection methods commonly used in transmission lines in China are expounded in this study, based on the statistical analysis of practical operation data. Combining the features of topography and geomorphology and the characteristics of bad climate, and tracing and summing up the lightning protection reconstruction project in recent years, the characteristics and laws of lightning strike on transmission lines in Minhou power grid are obtained, and the design is carried out. In construction and management, new methods and suggestions are put forward to achieve the goal of using various lightning protection techniques to protect the whole line.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM863

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