【作者】 袁涛；

【导师】 陈先禄；

【作者基本信息】 重庆大学 ， 高电压与绝缘技术， 2002， 硕士

【摘要】 重庆雷电定位系统运行两年多来采集到的数据进行分析研究结果表明重庆应属于强雷区，年雷电日数在95左右，平均每个雷电日中有7.022雷电小时，而地面落雷密度平均值为0.1216次/km2·d，比规程规定值高出一个数量级。因此对110kV输电线路频繁发生雷击故障的问题进行研究，提出输电线路防雷性能的改善措施，对于提高110kV输电线路防雷性能，防止输电线路发生雷击故障是十分必要。本文在现有输电线路防雷研究成果的基础上，进行了雷击输电线路杆塔和雷绕击输电线路的计算，探讨了在实际运行情况中影响线路型避雷器发挥作用的各种因素。在计算中，本文合理考虑了输电线路走廊的地形、线路的架设情况，根据行波法原理，建立了雷击输电线路杆塔的行波法计算模型。模型中考虑了雷电流幅值、杆塔冲击接地电阻、杆塔具体形状、尺寸、杆塔波阻抗、工频电压及档距等因素的影响。在计算雷电流绕击输电线路的耐雷水平时，本文采用了击距法，这种方法对诸如地面倾角、杆塔尺寸、杆塔的具体架设情况、导线和避雷线的放线系数、杆塔之间的档距以及雷电流的入射角等对绕击性能产生影响的因素考虑全面，符合重庆山区地形条件下输电线路雷击跳闸率计算的要求。计算表明：1） 线路型避雷器能明显改善山区输电线路的防雷性能，提高输电线路耐雷水平。2） 输电线路的接地电阻，线路档距等因素对线路型避雷器的应用有影响。接地电阻增大，线路档距加长，线路型避雷器对输电线路耐雷水平提高的作用减弱。根据上述计算结果，以线路走廊多位于山区、常发生雷击跳闸故障的110kV双含线为试验对象，安装了线路型避雷器以改善其防雷性能。通过两个雷雨季节的观察，发现110kV双含线没有再发生雷击跳闸故障，表明了线路型避雷器能明显改善山区输电线路的防雷性能，降低输电线路的雷击跳闸率。更多还原

【Abstract】 From the data collected by Lightning Location System, we can find that ChongQing is strong -lightning-day and has about 95 lightning days per year and has 7.022 hours per lighting day. In addition to the ground flashing density is 0.1216/km2·d and beyond the value of rules. So according as the fact of ChongQing power system，the paper will investigates the 110kV power transmission line because lightning often stroked the line last years.On the basis of research for power transmission line’s lightning-proof property, this paper calculate the lightning-withstand level when lightning strike to the tower and strike to the line directly and discusses the factor that effect line-surge arrester’s function. This paper takes landform of transmission line aisle and spanning instance into account with reason, establishes the model of light striking to the tower and transmission line by wave transmitting on power line. The model considers peak value of lightning current, tower grounding resistance, tower style, line surge impedance, power frequency voltage and distance between towers. When calculates the lightning-withstand level of lightning striking to line directly, this paper adopts Electric Geometry Model method because it can satisfy the fact of the transmission line on mountainous area. The results indicate:1) The line-surge arrester can improve the lightning-proof property of transmission line on mountainous area and enhance the lightning-withstand level.2) Tower grounding resistance, distance between towers, etc can affect the function of line-surge arrester. When their value increase, the line-surge arrester ’action weakens.On the basis of calculation, we fix line-surge arrester on 110kV Shuang-Han line. After the observing of transmission line for a lightning storm season, we didn’t find the lightning trip. The result indicates line-surge arrester can improve lightning-proof property evidently and reduce the lightning tripping outage.更多还原