华北电力大学本科毕业设计（论文）输电线路雷电绕击跳闸率计算摘要经济的快速发展离不开电力系统的不断扩展和完善，随着电力系统容量的不断扩大，拓扑结构日趋复杂，对输电线路故障的研究和防止成为追求系统安全稳定运行这一目标的重要课题。输电线路的雷击跳闸事故占输电线路事故的60%以上，尤其是在山区的输电线路，由于特殊的地理环境和多变的气候条件导致雷击成为线路故障的主要原因。根据国内外输电线路的运行统计结果，雷电绕击事故是雷击线路故障中的比例最高，也是输电线路跳闸事故的主要原因。因此，开展输电线路雷电绕击跳闸率计算研究，对于制定有效地防雷保护措施，指导我国输电工程线路防雷设计，提高电力系统安全可靠性具有重要的意义。本课题主要研究雷电绕击的机理，输电线路雷电绕击对输电可能产生的影响。在此基础上开展输电线路雷电绕击跳闸率计算方法分析，掌握几种不同计算方法的优缺点以及适用范围，并利用其中的一种计算方法对某一实例进行验证分析。最后为输电线路制定有效地防雷保护措施以及指导我国输电工程线路防雷设计提供理论依据。关键词：输电线路，跳闸率，雷电绕击I华北电力大学本科毕业设计（论文）AbstractRapideconomicdevelopmentisinseparablefromthecontinuousexpansionandimprovementofthepowersystem,withthegrowingcapacityofthepowersystemandthetopologyincreasinglycomplex,researchingandpreventingfaultsontransmissionlinestopursuesystemsafeandstableoperationbecameanimportantsubjectofthegoal.LightningAccidenttransmissionaccountsthetransmissionlineaccidentsformorethan60%,especiallyinthemountainsoftransmissionlines,duetothespecialgeographicalenvironmentandchangingclimateconditionsthatcauselightningtobecomethemainreasonforthefaultintheline.Accordingtothestatisticalresultsathomeandabroadtoruntransmissionlines,lightningshieldingfailurewasthehighestproportionofLightningstrokefault,whichisalsothemainreasonfortrippingaccidents.Therefore,developingthecalculationresearchoftransmissionlinelightningflashoverrateofshieldingfailureforeffectivelightningprotectionmeasurestoguidethedesignofthetransmissionlinelightningprotectionengineering,improvepowersystemsecurityandreliabilityisofgreatsignificance.Themainsubjectofthisarticleistostudythemechanismoflightningshielding,andtheeffectoflightningshieldingtransmissionlinesontransmission.Onthebasisofittodevelopthetransmissionlinelightningstriketripoutratecalculationmethodanalysis,tograspthescopeoftheadvantagesanddisadvantagesaswellasseveraldifferentcalculationmethods,andtheuseofacalculationmethodinwhichinstancesofaconfirmatoryanalysis.Finally,thedevelopmentofeffectivelightningprotectionmeasures,andguideourengineeringlightningprotectiondesignoftransmissionlinestoprovideatheoreticalbasisforthetransmissionlines.Keywords：transmissionlines,trippingrate,lightningshieldingfaiII华北电力大学本科毕业设计（论文）目录摘要..............................................................IAbstract...........................................................II第一章绪论........................................................11.1课题研究的背景和意义.........................................11.2课题研究的国内外现状.........................................21.3本文主要工作................................................3第二章雷电绕击的机理..............................................42.1雷电对输电线路的危害.........................................42.2雷电绕击的机理...............................................42.2.1雷电先导闪击的特性.....................................42.2.2高幅值雷电先导闪击的特性...........................
