35kv煤矿供电系统井上部分设计

大学本科毕业论文说明书1摘要林西煤矿系70万吨中小煤矿，已有百多年的历史，许多设备都是原来引进外国的。随着企业的发展，目前的供电系统已经不能保证安全、可靠的供电。本次设计是根据现有的供电系统的特点，对某些设备以及负荷分布进行改进，以满足供电的可靠性和安全性。本次供电系统的设计内容包括：负荷计算、地面变电所设计、短路电流计算、地面高低压设备选择、保护装置、变电所防雷及接地等。本设计主供电系统由来自不同地方的两路35kV线路供电，经主变压器变为6kV，由单母分段的接线方式向矿区供电。根据煤矿供电系统特点，系统主线路均以最大运行方式进行整定，并以此对线路及其设备进行选择。本次设计林西煤矿35kV供电系统只有井上供电系统部分。为保证供电的安全性和可靠性，又考虑林西煤矿15年的服务期限，从经济和技术两个方面对本矿进行整体设计，以达到满足对林西煤矿设计的合理性。关键词：林西煤矿；35kV；供电；负荷计算；设备选择；短路电流计算大学本科毕业论文说明书2AbstractThedesignisbasedonthecompletionoftheinternshipinthecoalmine.LinXiCoalMinethroughfieldvisits,inconjunctionwiththeexistinglevelofproductionplantandtheprospectsforfuturedevelopmentinthepowersupplysystemonthebasisoftherelevantprovisionsofthecoalproductionindustryfurtherstandardizeandimprove.LinXiCoalMineis70milliontonsandcoalmines,overahundredyearsofhistory,manyofwhichareoriginaltointroduceforeign.Withthedevelopmentofenterprises,thecurrentpowersupplysystemcannotguaranteethesafeandreliablepowersupply.Thisdesignisbasedonthecharacteristicsoftheexistingpowersupplysystem,forsomeequipmentandloaddistributionisimprovedtomeetthepowersupplyreliabilityandsecurity.powersystemdesigninclude：loadcalculations,groundsubstationsdesign,shortcircuitcurrentcalculations,groundhigh-lowvoltageequipmentselection,protectiondevices,Substationlightningprotectionandgrounding.Fromthedesignofthepowersupplysystemindifferentpartsofthetworoads35kVpowerline,themain6kVtransformersintothesingle-parentseparatelytotheMiningwiringelectricity.Accordingtothecharacteristicsofcoalsupplysystem,thedesignofthemainlinesarethelargestoperationofthesystemmeansthesetoflinesandequipmentandtochoose.LinXiCoalMine35kVpowersupplysystemdesignisonlypartofthepowersupplysystemInoue.Consideringthefifteenyears’serviceofLinXiCoalMine,inordertoensurethesecurityofelectricitysupply,reliable,thepaperdesignstheengineeringsystemwhichisreasonableforLinXiMinefromtheeconomicandtechnicalaspects.Keywords:LinXiCoalMine;35kV;PowerSupply;loadcalculations;electricalequipmentselection;shortcircuitcurrentcalculations大学本科毕业论文说明书1目录1概述..............................................12负荷计算...........................................42.1负荷分级与负荷曲线..........................................42.1.1供电负荷分级..........................................42.1.2负荷曲线..............................................42.2矿井用电负荷计算............................................52.2.1设备容量的确定........................................52.2.2多个用电设备组的计算负荷..............................72.2.3负荷计算..............................................72.3功率因数补偿...............................................102.3.1提高功率因数补偿的意义...............................102.3.2提高功率因数的方法...................................102.3.3电容器补偿计算.......................................123主变压器选择与主接线方案的确定.........................133.1主变压器容量和台数的确定原则...............................133.1.1主变压器容量的确定原则...............................133.1.2主变压器台数的确定原则...............................133.1.3主变压器的损失计算...................................143.1.4主变压器选型.........................................143.1.5全矿年电耗和吨煤电耗.................................153.2主接线方式的确定...........................................153.2.1供电系统接线方式的要求...............................153.2.2主接线形式...........................................163.335kV侧接线方式选择........................................163.3.1单元接线.............................................163.3.2桥形接线.............................................163.46kV侧接线方式选择.........................................183.4.1单母线接线...........................................183.4.2单母线分段式接线.....................................183.4.3双母线接线...........................................194短路计算..........................................214.1短路电流的分类与计算目的...................................21大学本科毕业论文说明书24.1.1短路的原因...........................................214.1.2短路的危害...........................................214.1.3计算短路电流的目的...................................214.1.4短路电流计算的标幺值法...............................214.2短路电流计算...............................................234.2.1计算短路计算点并绘制等效电路图.......................244.2.2选择计算各基准值.....................................244.2.3计算各元件的标幺电抗.................................254.2.4计算各短路点的短路参数...............................265设备选择..........................................305.1电气设备选择的一般原则.....................................305.1.1按工作电压选择.......................................305.1.2按工作电流选择.......................................305.1.3按环境类型选择.......................................305.1.4按断路容量选择.......................................315.2短路动、热稳定性校验.......................................315.2.1短路动、热稳定性校验原则.............................315.2.2热稳定校验...........................................315.2.3动稳定性校验.........................................325.335kV设备选择及其校验......................................325.3.135kV架空线、母线的选择..............................325.3.235kV断路器的选择....................................335.3.3高压隔离开关的选择...................................355.3.4电压互感器、熔断器的选择.............................365.3.5电流互感器的选择..........