错误!未指定书签。煤矿企业地面35/6kV变电所初步设计错误!未指定书签。机械工程系毕业设计(论文)任务书学生姓名专业班级设计(论文)题目错误!未指定书签。接受任务日期年月日完成任务日期年月日指导教师指导教师单位设计(论文)内容目标1负荷计算与功率因数补偿2供电系统短路电流计算335kv高压电气设备选择4电力线路选择5继电保护与自动装置设计(论文)要求绘图软件采用AutoCAD,查找煤矿电气设备,计算,设计完成后,提交错误!未指定书签。设计说明书一份。论文指导记录第1-4周:查文献资料,讲解相关专业知识,检查献综述和课题计划;第5-12周:检查、指导、画图,性能演算;第13-16周:指导、整理论文,准备答辩参考资料《供电技术》《电力工程》《煤矿电工手册》《煤矿供电及其设备》注:此表发给学生后由指导教师填写,学生按此表要求开展毕业设计(论文)工作。错误!未指定书签。新疆工业高等专科学校机械工程系毕业设计(论文)成绩表学生姓名专业班级设计(论文)题目指导教师(签名)指导教师单位指导教师评语评阅成绩:评阅教师签字:年月日答辩记录成绩:提问教师签字:年月日答辩小组意见答辩成绩:答辩小组组长签字:年月日错误!未指定书签。错误!未指定书签。I摘要供电系统是电力系统的一个重要环节,由电气设备及配电线路按一定的接线方式所组成;它从电力系统取得电能,通过其变换、分配、输送与保护等功能,将电能安全、可靠、经济地送到每一个用电设备的装设场所,再利用电气控制设备来决定用电设备的运行状态,最终使电能为国民经济和人民生活服务。拟定供电系统,主要是综合考虑矿井负荷性质,主变压器的台数、容量及电源线的情况来决定矿井地面35/6kV变电所的主接线方式。并绘制供电系统一次接线图。对于工矿企业35/6~10kV供电系统,一般为无限大电源容量系统,正常运行方式常为全分列方式或一路使用、一路备用方式,电路相对简单,故可在等效短路计算图中直接进行阻抗的串、并联运算,以求得各短路点的等效总阻抗,进而求得各短路参数。电气设备的选型,除了掌握电气设备选择理论外,还必须了解电气设备制造情况,才能选择出合理型号。对具体设备选择时,需要弄清其两种运行方式(正常和短路运行)下通过它的最大长时负荷电流和最大短路电流。热稳定校验是否合理,在很大程度上取决于继电保护动作时间确定的合理性。对于一级用电户,矿井地面35kV变电所要求双回路或环形供电,在例2-10中已确定为全分列运行,当一路故障时,另一路必须能保证全矿的供电,故最大长时负荷电流和正常工作电压损失均按一路供电考虑,表2-8中各6kV的一、二级负荷组也按此原则考虑。但在计算导线经济截面时,可按每路最多承担0.65~0.75左右的总负荷电流考虑。矿山地面35kV终端变电所是一级用电户,是高压开关与电器的密集区,并且运行方式多种多样,各开关互相交错,保护范围很短,故对变电所各级过流保护装置的设置与整定造成较大困难。关键词:1供电系统;2功率因数;3负荷计算;4短路计算;5设备选型;6电力线路;7继电保护;8自动装置错误!未指定书签。错误!未指定书签。IIAbstractPowersupplysystemisanimportantpartofthepowersystem,fromelectricalequipmentanddistributionlinesinaccordancewithcertainwiringformed;ittoobtainenergyfromthepowersystem,throughitstransformation,distribution,transportationandprotectionfunctions,willbeenergysecurity,reliableandeconomicallytoeveryplaceinstallationofelectricalequipment,electricalcontrolequipmentre-useelectricalequipmenttodetermineoperationalstatus,andfinallytoenergyservicesforthenationaleconomyandpeople'slives.Developmentofpowersupplysystem,themainloadistakenintoaccountthenatureofmine,themaintransformerstationnumber,capacity,andpowercordtodeterminetheminesituationinthemainsubstationground35/6kVwiring.Anddrawawiringdiagramofpowersupplysystem.Fortheindustrialandminingenterprises35/6~10kVpowersupplysystem,generallyinfinitepowercapacitysystem,thenormaloperationmodeoftenorallthewaytousedisaggregatedway,wayback-waycircuitissimple,itcanbecalculatedintheequivalentcircuitdiagramindirectimpedanceseriesandparallelcomputing,inordertoachievetheshort-circuitthetotalimpedanceoftheequivalentpoint,andthencalculatedtheshort-circuitparameters.ElectricalEquipment,inadditiontocontrolelectricalequipmentchoicetheory,butalsomustunderstandthemanufactureofelectricalequipmentinordertoselectareasonablemodel.Selectionofspecificequipment,theneedtoclarifyitstwooperationmodes(normalandshortrun),themaximumlengthoftimethroughitsloadcurrentandmaximumshortcircuitcurrent.Thermalstabilitytestisreasonable,dependslargelyontherelayoperatingtimetodeterminereasonableness.Forauserofelectricity,coalmineground35kVsubstationorringdouble-looppowersupplyrequirements,inthecaseof2-10hasbeenidentifiedasrunningthewholebreakdown,whenfaultstheway,anotherwaytobeabletoguaranteethepowersupplyallmineTherefore,whentheloadcurrentandthemaximumlengthofthenormalpowersupplyvoltagelossJunanconsiderthewaythetable2-8inthe6kVoneortwoloadgroupsarealsoconsideringthisprinciple.However,inthecalculationoftheeconomic错误!未指定书签。错误!未指定书签。IIIsectionofwire,itcantakeupto0.65perroadaround0.75toconsiderthetotalloadcurrent.Mineisoneterminalsubstationground35kVelectricityusers,thehigh-voltageswitchesandappliancesintensiveareas,andrunavarietyofways,eachswitchcrossedthescopeofprotectionisveryshort,itisontheSubstationatalllevelsofovercurrentprotectiondevicesettingsandcreategreaterdifficultiesadjustingKeywords:1apowersupplysystem;2powerfactor;3loadcalculation;4short-circuitcalculations;5equipmentselection;6powerlines;7protection;8automaticdevices错误!未指定书签。错误!未指定书签。IV目录摘要...................................................................................................IAbstract.................................................................................................II第一章负荷计算与功率因数补偿.................................................11.1概述..............................................................................................11.2计算各组负荷与填表.................................................................31.3各低压变压器的选择与损耗计算.............................................51.3.1机修厂、工人村与支农变压器..............................................................51.3.2地面低压动力变压器..............................................................................51.3.3洗煤厂变压器..........................................................................................51.3.4各变压器功率损耗计算..........................................................................51.4计算6kV母线上补偿前的总负荷并初选主变压器................61.5功率因数补偿与电容器柜选择.................................................71.5.1选择思路..................................................................................................71.5.2无补偿时主变压器的损耗计算..............................................................71.5.335kV侧补偿前的负荷与功率因数.................