【作者】 金学军；

【导师】 廖瑞金；

【作者基本信息】 重庆大学 ， 电气工程， 2003， 硕士

【摘要】 本文针对贵州500kV鸭福输电线路雷击事故频繁的情况，对其耐雷性能进行了深入研究。首先利用规程法对线路的耐雷性能进行计算、分析，并与现场数据比较；同时结合目前对杆塔波阻抗的研究方法，提出一种更合理的杆塔波阻抗计算模型—杆塔分布参数模型，并利用EMTP进行仿真计算和验证。并从电磁场角度出发，对击距系数进行研究，提出改进的电气几何模型。通过对鸭福500kV输电线路耐雷性能的研究，得到以下结论：规程法计算结果表明该线路跳闸率在0.32次／年．60雷电日以内；用分布参数模型来分析杆塔波阻抗，其仿真值与实测值的相对误差在10％以内；利用杆塔分布参数模型计算鸭福500kV输电线路故障杆塔的反击跳闸率结果比利用规程法计算的结果大25％左右；在高杆塔情况下，击距系数不再等于1，随着杆塔高度的增加，击距系数呈线性下降，雷电流值对击距系数没有影响；利用传统电气几何模型计算结果表明该线路不会发生闪络，与实际运行情况差别较大；利用改进的电气几何模型计算的结果表明绕击跳闸率为0.884265次／年·60雷电日，与实际运行情况比较吻合；影响500kV鸭福输电线路耐雷性能的主要因素有接地电阻、线路绝缘强度、杆塔高度、地面倾角、沿线地形、杆塔类型等，并结合现场数据，提出较为合理的防护措施，论文研究结果将为提高鸭福500kV输电线路耐雷水平提供理论依据和数据，并为同类型线路提供参考。更多还原

【Abstract】 According to the condition that the lightning accidents are taken frequently for 500kV Yafu transmission line, the paper studied on the lightning protection performance deeply. Used regulations method calculating, analyzing and comparing the lightning protection performance with field data for the line firstly,. Then Put forward more reasonable model (distributing parameter model) to calculate the surge impedance of tower combining the existing model and validate by EMTP, furthermore studied the striking distance factor based on electromagnetism. Conclusion are drought as follow by studying the lightning protection performance for 500kV Yafu transmission line: the outage rates is in 0.32 flashes/year by regulations method. Using distributing parameter analyzing the surge impedance of tower, the simulation value of tower surge impedance is close to the test value and the relative error between is in ten percent. The value of the outage rate with distributing parameter model is larger twenty five percent than with regulations method. The striking distance factor is not equal to but smaller than 1 for higher tower, the value of lightning current is not influence in the striking distance factor. The different between the result by traditional EGM with the field data is large. The outage rates is 0.884265 flashes/100km/year by improved EGM and tallies with the field data. The main factor that influence the lightning protection performance are grounding resistance, the strength of insulators, the height of tower, ground obliquity, terrain along the line and so on. By combining with the field data, this paper also bring forward some more reasonable methods of lightning protection. The results of this paper will provide gist to the protection of YaFu 500kV transmission line and the same type transmission lines.更多还原