220kV变电站直流系统设计(李斌)定稿

科类工科学号2010311236本科生毕业设计220kV变电站直流系统设计220kVSubstationDCSystemDesign李斌指导教师：李裕职称讲师云南农业大学昆明黑龙潭650201学院：机电工程学院专业：电气工程及其自动化年级：2010级设计提交日期：2014年4月26日答辩日期：2014年5月10日答辩委员会主任：张汝坤云南农业大学2014年5月4日云南农业大学机电工程学院毕业设计I220kV变电站直流系统设计李斌云南农业大学机电工程学院，昆明黑龙潭650201摘要直流系统在变电站中为继电保护、控制、信号、计算机监控、事故照明、交流不间断电源等提供可靠的直流电源，对变电站的安全运行起着至关重要的作用，是变电站安全运行的保障。本次设计主要针对一个具体的220kV变电站进行了直流系统的设计，设计主要完成以下几个内容1）介绍了直流系统的相关知识；2）依据《电力工程直流系统设计规程》及《电力工程电气设计手册——电气二次部分》等相关规定确定了该220kV变电站直流系统的电压等级及直流系统接线方案并绘制接线图纸；3）进行了该220kV变电站直流负荷统计计算，确定了蓄电池的组数与个数，并进行了蓄电池容量的确定及校验；4）进行了充电回路和直流系统回路相关的设备选择。设计及计算严格按设计手册及相关设计说明书，基本能够保证其安全、可靠、灵活、经济性。关键词：变电站；直流系统设计；蓄电池组；负荷统计；设备选型220kVSubstationDCSystemDesignLiBinFacultyofEngineeringandTechnologyYunanAgriculturalUniversity，HeilongtanKunming650201云南农业大学机电工程学院毕业设计ABSTRACTDCsystemintransformersubstationforrelayprotection，control，signal,computermonitoring,emergencylighting,ACuninterruptiblepowersupply,suchastheprovisionofreliabledcpowersupply,safeoperationoftransformersubstationplaysanimportantrole,istheguaranteeofthesafeoperationofthetransformersubstation.Tocomprehensivecomparisonandanalysisoftheresearchtopic,thesizeofthedcloadcalculatedaccordingtotheactualcircumstanceoftransformersubstationtodeterminethenumberandcapacityofthebattery,thentoselectthedcequipment.Hisdesignisaimedataspecificdesignof220kvsubstationdcsystem,thedesignmainlycompletedthefollowingcontent1)Introducedtherelevantknowledgeofdcsystem,2)Onthebasisoftheelectricalengineeringdcsystemdesignregulationsandelectricalengineeringelectricaldesignmanual,electricsecondpart,therelatedprovisions,determinethevoltagelevelof220kvsubstationdcsystemanddcsystemconnectionschemeanddrawthedrawingsincluding3)Forthe220kvsubstationdcloadstatisticalcalculation,determinethenumberofgroupnumberandthebatteryandbatterycapacitydeterminationandcalibration,4)Onthechargingcircuitdcsystemcircuitandrelatedequipmentselection.Thedesignandcalculationinaccordancewiththedesignmanualandrelateddesignspecifications,basiccanensurethesafe,reliable,flexibleandeconomicalefficiency.Keywords:Substation;DCPowerSystemDesign;Battery;Loadstatistical;Equipmentselection云南农业大学机电工程学院毕业设计II目录摘要..............................................................I目录..............................................................II表目录..........................................................III图目录...........................................................IV1绪论.............................................................11.1课题背景....................................................11.1.1直流操作电源的设计技术发展.............................11.1.2直流操作电源的设备技术发展.............................11.2课题意义....................................................21.3设计的主要内容..............................................32直流系统简介.....................................................42.1直流系统的作用..............................................42.2直流系统类型................................................42.2.1蓄电池直流系统.........................................42.2.2硅整流电容储能直流系统.................................52.2.3复式整流直流系统.......................................62.2.4电源变换式直流操作电源.................................62.3本次设计的原始资料..........................................73直流系统回路设计.................................................83.1直流系统的额定电压..........................................83.2220kV直流系统蓄电池的确定..................................83.2.1蓄电池的分类...........................................83.2.2蓄电池组的确定.........................................93.3直流系统基本接线方式.......................................113.3.1单母接线方式..........................................113.3.2单母线分段接线方式....................................123.4直流系统馈电网络设计.......................................143.4.1辐射供电网络..........................................14云南农业大学机电工程学院毕业设计3.4.2环路供电网络..........................................154直流负荷统计....................................................174.1负荷分类...................................................174.1.1按功能分类............................................174.1.2按负荷性质分类........................................174.2直流负荷统计...............................................174.2.1220kV变电站主接线分析................................174.2.2经常负荷统计..........................................184.2.3事故负荷统计..........................................184.2.4冲击负荷统计..........................................194.3事故停电时间...............................................195直流系统相关设备选型............................................215.1蓄电池的个数...............................................215.1.1电压偏差范围..........................................215.1.2蓄电池个数选择........................................215.2充电方式...................................................225.3铅酸蓄电池.................................................235.3.1铅酸蓄电池的容量特性..................................235.3.2放电特性..............................................245.4蓄电池容量的计算..........................................265.4.1蓄电池容量的选择......................................265.4.2蓄电池容量的校验......................................275.5设备选择...................................................285.5.1充