PAGE\*MERGEFORMAT50XXXXX大学本科毕业设计10KV降压变电所继电保护设计学生姓名XXXXX院系名称XXXXX专业名称XXXXX班级XXXXX学号XXXXXXX指导教师XXXXXX完成时间XXXXXX10KV降压变电所继电保护设计学生：XXXX指导老师：XXX摘要：电力在现代社会生产生活的各个方面都起着不可替代的重大作用。变电所是电力系统的重要组成部分，它直接影响整个电力系统的安全与经济运行，是联系发电厂和用户的中间环节，起着变换和分配电能的作用。当变配电站运行过程中发生故障和出现不正常运行状态时，要求继电保护能有选择性发出跳闸命令切除故障或发出报警信号，从而减小故障造成的损失，保证电力系统安全稳定运行。本次变电所继电保护的初步设计包括了：负荷分析计算、变压器选择、主接线的选择短路电流计算、高低压电力线路与一次设备的选择、继电保护整定计算、防雷与接地保护等内容。关键词：变电所；配电系统；继电保护；Abstract:Electricenergyplaysanirreplaceableroleinallaspectsofthemodernsocialproductionandlife.Thesubstationisanimportantpartofpowersystem,whichdirectlyaffectsthesafetyandeconomicoperationofthewholepowersystem.Thesubstationistheintermediatelinkbetweenpowerplantsandusers,playsaroleintransformationanddistributionofelectricenergy.Whenthesubstationoccursfaultorappearabnormalstateintherunningcourse,therequirementsofproactiverelayingcansendouttrippingcommandresectionfaultselectivelyoralarmsignal,soastoreducethelosscausedbyfault,andensurethesafeandstableoperationofpowersystem.Thepreliminarydesignofthesubstationprotectiverelayinginclude:(1)loadanalysis(2)theselectionoftransformer(3)themainconnectionofchoice(4)calculationofshortcircuitcurrent(5)highandlowvoltagepowerlineandprimaryequipmentselection(6)protectiverelayingsettingcalculation(7)lightningprotectionandgroundingprotectionandsoon.Keywords:substation;powersystem;protectiverelaying;目录TOC\o"1-2"\h\z\uHYPERLINK\l"_Toc387226461"目录PAGEREF_Toc387226461\h3HYPERLINK\l"_Toc387226462"1原始资料PAGEREF_Toc387226462\h5HYPERLINK\l"_Toc387226463"1.1供电用户基础资料PAGEREF_Toc387226463\h5HYPERLINK\l"_Toc387226464"1.2地理及水文资料PAGEREF_Toc387226464\h5HYPERLINK\l"_Toc387226465"1.3工厂供电协议PAGEREF_Toc387226465\h5HYPERLINK\l"_Toc387226466"1.4供电负荷PAGEREF_Toc387226466\h5HYPERLINK\l"_Toc387226467"2变电所负荷计算和无功补偿计算PAGEREF_Toc387226467\h7HYPERLINK\l"_Toc387226468"2.1计算负荷的意义及负荷计算法的确定PAGEREF_Toc387226468\h7HYPERLINK\l"_Toc387226469"2.2需要系数法的基本概念PAGEREF_Toc387226469\