220kv变电站毕业设计

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国泰220kV一次降压变电所电气部分设计-I-中文摘要本文主要对国泰220kV一次降压变电所电气部分进行设计,根据任务书的要求,设计的主要内容包括主变选择、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以及防雷保护的规划等主要工作。本文中对主变的选择、电气主接线的拟定、配电装置的规划、继电保护和自动装置的规划进行了详细的说明,特别是对主变继电保护的规划、动作原理等内容进行了深入的研究和思考。本文重点的计算部分包括短路计算、设备的选择校验计算、和避雷针的保护范围计算等部分。其中短路计算包括对称短路计算和不对称短路计算两部分,分别应用了计算曲线和正序等效原则;防雷计算中采用了等针高的计算方式。本次设计既满足了电力系统的安全、经济、可靠、环保的基本要求,又重视了电力系统的长期规划长远的发展,注重了解和应用电力系统的新技术新设备,变电所进行设计,是一次较为综合性的实践过程。是对以往所学专业知识的系统总结和提高。本设计属于变电所电气部分初步设计,能够基本满足任务书和毕业论文的总体要求。关键词变电所,电气系统,短路计算,电气设备沈阳工程学院毕业设计-II-AbstractInthispaperTheprofessionalgraduateinsysteminelectricpowerdesignisoncemoresynthesizeoftraining,itiswewillduringtheperiodofschoolaprofessionforlearningknowledgeproceedtheoriesandpracticeverygoodcombination,makeuseofthetheoriesknowledgeproceedswithaprofessionforlearningtechnicalabilityengineeringdesignwithsciencestudy.Thisgraduatedesignthesisisa220kVdecliningtopresstochangetogiveorgetanelectricshockanelectricitypartsoffirststepsdesign.Forthesakeofdependablethatguaranteethepowersupplywitharequestthatcontentedlong-termburthen,carriesaccordingtotheforwardtheprogrammingproceedingdesigndevelopments,frombutguaranteetochangetogiveorgetanelectricshockcanlong-termdependablepowersupply.Thisdesignnotonlymeetsthepowersystemsecurity,economic,reliable,basicrequirementsofenvironmentalprotection,butalsotothelong-termpowersystemplanninglong-termdevelopment,focusingonunderstandingandapplicationofnewtechnologiesandnewpowersystemequipment,substationdesign,isamoreintegratedpractice.Istheknowledgelearnedinthepastandupgradethesystem.Thisdesignispartofthepreliminarydesignofelectricalsubstationsandcanbasicallymeettheoverallmissionstatementandtheserequirements.KeyWordsubstation,electricpowersystem,shortcomputing,electricityequipment国泰220kV一次降压变电所电气部分设计-III-目录中文摘要..........................................................................................................................................IAbstract..........................................................................................................................................II目录...............................................................................................................................................III第一部分说明书...........................................................................................................................11主变压器的选择.........................................................................................................................11.1主变选择的有关规定.......................................................................................................11.2主变选择的原则...............................................................................................................11.2.1主变台数的确定.....................................................................................................11.2.2变压器形式的选择.................................................................................................11.2.3主变容量的确定.....................................................................................................22电气主接线的选择.....................................................................................................................32.1概述...................................................................................................................................32.2主接线的设计原则...........................................................................................................32.2.1考虑变电所在电力系统中的地位和作用.............................................................32.2.2考虑近期和远期的发展规模..................................................................................32.2.3考虑负荷的重要性分级和出线回路数多少对主接线的影响..............................32.2.4考虑主变台数对主接线的影响..............................................................................42.2.5考虑备用容量的有无和大小对主接线的影响......................................................42.3主接线设计的基本要求...................................................................................................42.3.1可靠性.....................................................................................................................42.3.2灵活性.....................................................................................................................42.3.3经济性.....................................................................................................................52.4主接线的确定...................................................................................................................52.4.1对原始资料的分析.................................................................................................52.4.2主接线方案的拟定.................................................................................................53短路计算.....................................................................................................................................83.1概述...................................................................................................................................83.2短路电流计算的主要目的....................................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