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毕业设计(论文)发电厂电气系统一次设计系别电力工程系专业班级电气08K5学生姓名刘维娜指导教师刘英培2012年6月华北电力大学科技学院毕业设计-II-发电厂电气一次系统设计摘要电力系统专业的毕业设计是比较综合的训练，它是我们将在校期间所学的专业知识进行理论与实践的很好结合，运用理论知识和所学到的专业技能进行工程设计和科学研究，提高分析问题和解决问题的能力。在完成此设计过程中，我们可以学习电力工程设计、技术问题研究的程序和方法，获得搜集资料、查阅文献、调查研究、方案比较、设计制图等多方面训练，并进一步补充新知识和技能。本毕业设计论文是2*50MW供热式火力发电厂电气部分设计。为了保证供电的可靠性和一次性满足远期负荷的要求，按照远期负荷规划进行设计建设，从而保证发电厂能够长期可靠供电。根据毕业设计任务书的要求，综合所学专业知识及《发电厂电气设计手册》等书籍的有关内容，设计过程中完成了主变选择、电气主接线的拟定、短路计算、电气设备选择、配电装置的规划、继电保护和自动装置的规划和防雷保护的规划等主要工作。在此期间，遇到的种种问题均通过反复比较、验算，并请教老师得以解决。毕业设计论文由设计说明书、设计计算书、一套图纸（电气主接线图、总平面布置图、配电装置断面图、防雷保护图）组成。内容较为详细，对今后扩建有一定的参考价值。近年来，电力在世界各国能源和经济发展中的作用日益增长，它已成为现代社会实用最广、需要最快的能源。发电厂的合理设计与建设是一个极其重要的组成部分。本次设计是通过本人的精心设计论证完成的。整个设计过程中，全面细致的考虑工程设计的可靠性、经济性、灵活性等诸多因素，最终完成本设计方案。通过完成此毕业设计论文，进一步领会我国电力工业建设的政策观念和经济观点，培养对工程技术、经济进行较全面的综合分析能力。由于时间紧张和能力有限，此论文中难免会出现遗漏和错误，希望老师给予指点和更正。关键词：火力发电厂；电气设计；短路计算；设备选择；配电装置华北电力大学科技学院毕业设计-III-AbstractTheprofessionalgraduateinsysteminelectricpowerdesignisoncemoresynthesizeoftraining,itiswewillduringtheperiodofschoolaprofessionforlearningknowledgeproceedtheoriesandpracticeverygoodcombination,makeuseofthetheoriesknowledgeproceedswithaprofessionforlearningtechnicalabilityengineeringdesignwithsciencestudy,increaseanalyzeproblemwithproblem-solvingability.Incompletethisdesignprocess,wecanstudytheelectricpowerengineeringthedesign,investigativeprocedureinproblemintechniquewithmethod,becollectedinformation,checkedtheculturalheritage,investigatetheresearch,projectcomparisonanddesignthevarioustraininginetc.ingraphics,combinefurthercomplementthenewinformationknowswithtechnicalability.Thisgraduatedesignthesisisa2*5MWheatingtypethermalpowerplantelectricitypartdesign.Forthesakeofdependablethatguaranteethepowersupplywitharequestthatcontentedlong-termburthen,carriesaccordingtotheforwardtheprogrammingproceedingdesigndevelopments,frombutguaranteetochangetogiveorgetanelectricshockcanlong-termdependablepowersupply.Designtherequestofthemissionbookaccordingtothegraduate,synthesizeaprogrammingforlearningprofessionknowledgeand《Thermalpowerplantelectricitydesignhandbook》designedwaitingdog's-earrelevantlycontents,designingintheprocesscompletinglordchangingchoice,electricitylordconnectinglineardraw-up,shortcircuitcomputing,electricityequipmentschoosing,goingtogetherwithelectricityequiping,aftergiveorgetanelectricshocktheprotectionwiththeprogrammingoftheautomaticdevicewithdefendprotectiveprogramminginthunderetc.mainwork.Hereperiod,allkindsproblemsthatmeetallpassestocompare,checktocalculateagainandagain,andaskthecansolutioninteacher.Graduatetodesignthethesisfromdesignthemanual,designcalculationbook,asetofdiagramspaper(theelectricitylordconnectsthelinediagram,totalflatsurfacearrangesthediagramandgotogetherwithelectricityequipcrosssectiondiagram,defendthunderprotectiondiagram)constitute.Thecontentsismoredetailed,tofromnowonextendtoconsultscertainlyvalue.Forthisyear,electricpowerisininternationalcommunityenergywitheconomydevelopof华北电力大学科技学院毕业设计-IV-thefunctionincreasesincreasingly,ithavebecomemodernthesocietyispracticalthemostwidelyandneedthequickestenergy.Changethereasonabledesignthatgiveorgetanelectricshockareawithdevelopmentsveryconstitutingthepartimportantly.Thisdesignisatguidingteacherdescend,passingoneselfofdesignwhatargumentcompletewithmeticulouscare.Wholedesignprocessinside,completelydependable,economic,vivid...etc.manyfactorsthatmeticulousconsiderationengineeringdesign,endcompletethisdesignproject.Passtocompletethisgraduatedesignthethesis,furtherappreciatingtheourcountrythepolicyideaofelectricpowerindustrydevelopmentswiththeeconomicstandpoint,educatestoproceedtotheengineeringtechnique,economymorecompletelytosynthesizetheanalyticalskill.Becausetimestrainwithabilitylimited,thisthesisinsidedifficultdonotneedtowillappearthelapsewithmistake,hopetheteachergivetopointoutwithmakecorrection.Keyword:Thermalpowerplant;Electricitydesign;shortcicuitcalculation;Theequipmentschoice;electricityequips华北电力大学科技学院毕业设计-V-目录摘要...............................................................................................................................................IIABSTRACT........................................................................................................................................III1前言.............................................................................................................................................12电气主接线设计.........................................................................................................................22.1主接线的设计原则.................................................................................................................22.2主接线设计的基本要求.........................................................................................................32.2.1主接线可靠性的要求.........................................................................................................32.2.2主接线灵活性的要求.........................................................................................................32.2.3主接线经济性的要求........................................