摘要电能是经济发展最重要的一种能源，可以方便、高效地转换成其它能源形式。当今，火力发电在我国乃至全世界范围，其装机容量占总装机容量的70％左右，发电量占总发电量的80％左右。由此可见，电能在我国这个发展中国家的国民经济中担任着主力军的作用。设计中将主要从理论上在电气主接线设计，短路电流计算，电气设备的选择，配电装置的布局，防雷设计，发电机、变压器和母线的继电保护等方面做详尽的论述，并与三河火力发电厂现行运行情况比较，同时，在保证设计可靠性的前提下，还要兼顾经济性和灵活性，通过计算论证该火电厂实际设计的合理性与经济性。在计算和论证的过程中，结合新编电气工程手册规范，采用CAD软件绘制了大量电气图，进一步完善了设计。关键词：主接线设计，短路电流，配电装置，电气设备选择，继电保护AbstractElectricityisthemostimportantenergyofeconomicdevelopmentwhichcanbeconvenientlyandefficientlyconvertedintootherformsofenergy.Today,notonlyinChinabutalsointheworld,thethermoelectricitycapacityaccountstoabout70%andthepowerabout80%.So,electricityplaysanimportantroleinourcountrywhichisadevelopingcountry.Inthisdesign,Iwillmainlydiscussmainelectricconnectiondesign,shortcircuitaccount,electricequipmentchoice,electricequipmentlayout,lightningstrikedefendingdesign,electricalmachine,transformerandgeneratrixprotectiverelayingdetailedlyintheoryandcomparingwiththepowerplantofSanhe,whileensuringthereliabilityofthedesign,underthepremiseweshouldalsotakeintoaccounteconomicandflexibilitydemonstratedbycalculatingtheeffectivethermalpowerplantdesignandreasonableeconomy.Duringmycountinganddemonstrating,inordertoconsummatemydesign,Iwillprotractagreatlotofelectricengineering-picturesbyAuto-CADfollowingthenewcriterionofelectricengineering-enchiridion.Keywords：mainelectricconnectiondesign,shortcurrent,electricequipmentchoice,electricequipmentlayout,protectiverelaying目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc435954001"摘要PAGEREF_Toc435954001\hIHYPERLINK\l"_Toc435954002"AbstractPAGEREF_Toc435954002\hIIHYPERLINK\l"_Toc435954003"1绪论PAGEREF_Toc435954003\h1HYPERLINK\l"_Toc435954004"1.1课题背景PAGEREF_Toc435954004\h1HYPERLINK\l"_Toc435954005"1.1.1社会背景PAGEREF_Toc435954005\h1HYPERLINK\l"_Toc435954006"1.1.2专业学习背景PAGEREF_Toc435954006\h1HYPERLINK\l"_Toc435954007"1.2课题研究的目的和意义PAGEREF_Toc435954007\h1HYPERLINK\l"_Toc435954008"1.3国内外研究现状PAGEREF_Toc435954008\h2HYPERLINK\l"_Toc435954009"1.3.1电