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东北农业大学学士学位论文学号：A0710060335kV无人值守变电站电气部分设计学生姓名：方炎指导教师：赵玉林所在院系：电气与信息学院所学专业：农业电气化及自动化研究方向：地方电力系统及其自动化东北农业大学中国·哈尔滨2014年5月NortheastAgriculturalUniversityBachelor’sDegreeThesisStudentID：A07100603SystemDesignForTheElectricalPartOfUnattendedSubstationOf35kVName：FangYanTutor：ZhaoYulinCollege：CollegeofElectronicandInformationMajor：ElectronicInformationEngineeringDriction：LocalPowerSystemAndItsAutomationNortheastAgriculturalUniversityHarbin·ChinaMay2014摘要随着国民生活水平的提高，大量新型用电设备涌现在国民的日常生活中，用电器的数量及种类对电能的质量提出了更高的要求。在国民畅享科技进步的同时，还须确保电力系统能够安全、可靠、优质、经济的运行。因此，必须提高电力网络供电可靠性和发电设备利用率，改善电力系统运行状况，满足经济性和稳定性的要求。本设计的目的是设计一座需要新建35KV变电站，以满足某地区的发展需求。设计以实际负荷为依据，以变电所的预期运行方式为基础，按照国家有关规定和规范，完成了满足该地区供电要求的35kV变电所初步设计。首先，通过分析几种典型主接线设计方案及特点，总结比较各种典型主接线方案的运行灵活性和供电可靠性，确定了该35kV智能变电站的主接线方式，依据电力系统变电站建设要求，主变压器选择要求和绥中变电站供电区域负荷现状、负荷预测、用户对供电可靠性的要求，确定了主变压器台数、容量和型号。其次，通过短路电流计算，对变电站主要电气设备进行选择，并校验其热稳定和动稳定。并对该35kV变电站防雷及接地进行设计和校验；最后，对该35kv的二次系统进行设计。本文讨论和分析了数字化变电站建设中的相关理论,并试图把这些理论运用到现今实际变电站的建设中,以便加强数字化变电站理论和实际工程之间的相互联系。随着智能化的电气开关发展,尤其是非常规互感器、智能断路器等新型技术的发展,变电站自动化的水平不断提高,初步进入了数字化的时代。关键词：35KV变电站，负荷计算，短路电流，设备选择，防雷保护35kV无人值守变电站电气部分设计-II-SystemDesignForTheElectricalPartOfUnattendedSubstationOf35kVAbstractWiththeimprovementofnationallivingstandard,alargenumberofnewtypeelectricalequipmentemergeinnationaldailylife,whichputforwardahigherrequesttothequalityofpower.Whennationalareenjoyingthetechnologyprogress,wemustensurethatelectricpowersystemcanberunsafely,reliably,high-quality,andreasonably.Asaresult,wemustimprovethereliabilityofelectricitynetworksupplyandtheutilizationofpowergenerationequipment,andmakebetterthepowersystemoperatingconditions,inordertomeettherequirementsoftheeconomyandstability.Thepurposeofthisdesignistodesignanew35kvsubstation,inordertosatisfythedemandsofthedevelopmentofaregion.The35kvsubstationpreliminarydesignwhichsatisfiestherequirementofpowersupplyinthisregionwasbasedontheactualloadandforecastoperationmodeofthesubstation,andinaccordancewiththerelevantprovisionsofthestateandspecifications.First,throughanalysisingseveraltypicalcharacteristicsofmainelectricalconnectionscheme,summaryofcomparisonofvarioustypicaloperationalflexibilityandreliabilityofmainelectricalconnectionscheme,determinethemainelectricalconnectionschemeofthis35kVintelligentsubstation.Accordingtotheelectricpowersystemsubstationsconstructionrequirements,selectionrequirementsandthepowersubstationmaintransformerloadstatus,loadforecasting,userrequirementsforreliability,determinethenumber,capacityandtypeofmaintransformer.Secondly,byshortcircuitcurrentcalculations,toselectthemainelectricsubstationequipment,andverifyitsthermalstabilityanddynamicstabilityandthis35kVsubstationlightningprotectionandgroundingdesignandvalidation.Finally,designingthesecondaryelectricsystemofthis35kVsubstation.Thisarticlediscussesandanalyzestherelatedtheoryintheconstructionofdigitalsubstation,andtrytoapplythesetheoriestothecurrentactualsubstationconstruction,inordertostrengthenthedigitalsubstationconnectedbetweenthetheoryandpracticalengineering.Withthedevelopmentofintelligentelectricalswitches,especiallytheunconventionaldevelopmentofnewtechnologies,suchastransformer,intelligentcircuitbreaker,substationautomationlevelunceasingenhancement,thepreliminaryintothedigitalera.Keywords：35KVsubstation，loadcalculation，short-circuitcurrent，equipmentselection，lightningprotection35kV无人值守变电站电气部分设计-III-目录摘要.............................................................................................................................................IIIAbstract.............................................................................................................................................II1前言...........................................................................................................................................11.1研究的目的与意义...................................................................................................11.2国内外研究现状.......................................................................................................11.3设计(论文)的主要研究内容....................................................................................22负荷分析...................................................................................................................................32.1负荷的分级...............................................................................................................32.2负荷计算...................................................................................................................32.2.1负荷计算方法...................................................................................................42.2.2负荷的计算.......................................................................................................43主变压器选择...........................................................................................................................63.1主变压器的选择原则...............................................................................................63.2主变压器台数的选择........................................