110KV变电站电气二次部分初步设计

本科毕业设计论文题目110kv变电站电气二次部分初步设计学生姓名陶杰学号073522008所属院部电子与信息工程学院专业电气工程及其自动化班级电气2班指导教师孟鹏2011年5月摘要I摘要本次设计任务旨在体现对本专业各科知识的掌握程度，同时检验本专业的学习结果。首先根据任务书上所给系统与线路及所有负荷的参数，分析负荷发展趋势。从负荷增长方面阐明了建站的必要性，然后通过对拟建变电站的概括以及出线方向来考虑，并通过对负荷资料的分析，安全，经济及可靠性方面考虑，确定了110kV，35kV，10kV以及站用电的主接线，然后又通过负荷计算及供电范围确定了主变压器台数，容量及型号，同时也确定了站用变压器的容量及型号，最后，根据最大持续工作电流及短路计算的计算结果，做出线路保护，变压器保护，母线保护，防雷保护。从而完成了110kV电气二次部分的设计。关键词：电力系统，短路电流，继电ABSTRACTIIABSTRACTDesignthetaskthistimeisaimatintensityofmasteringofeverysubjectknowledgeofthisreflecting,andoftestthisstudyresult.first,analyzethetendofloaddepartmentaccordingtoallparameterofloadaboutsystemandcircuitontaskbook.Itexpoundsthenecessitytothissituationfromtherespectofincreasingload.Thenthroughtothegeneralizationofplanningtobuildthetransformersubstationandtheanalysisoftheloadmaterials,safe,economyanddependabilityareconsidered,hasconfirmedthemainlywiringformof110kv,35kv,10kv.CalculatedandsuppliedpowerintherangeandconfirmedTVstation'snumberofthemainvoltagetransformerthroughloadfinally,capacityandtype,capacityandtypeofusingthevoltagetransformerstandsurelyatthesametime,finally,theresultofcalculationofcalculatingthatandshortoutaccordingtotheelectriccurrentoflargestlastingjob,makethecircuittoprotect,thevoltagetransformerisprotected,thebusbarisprotected,preventthethunderfromprotecting.Thusfinishedelectricdesignsoftheparttwotimesof110kvKeyWords：Powersystem；shortoutintheelectriccurrent；relayprotection目录III目录1绪论......................................................................................................................................12变电站的分析与设计..........................................................................................................32.1变电站的总体分析.......................................................................................................32.2变电站的负荷分析.......................................................................................................42.2.1Ⅰ、Ⅱ类负荷分析..............................................................................................53主变压器的选择及主接线选择..........................................................................................73.1主变压器的选择...........................................................................................................73.1.1主变容台数的选择................................................................................................73.1.2主变容量选择........................................................................................................73.1.3主变容量选择原则................................................................................................73.1.4主变台数的选择原则............................................................................................83.1.5主变容量和台数选择计算....................................................................................83.1.6绕组数和绕组连接方式的选择............................................................................83.1.7全绝缘、半绝缘、绕组材料等问题的解决........................................................83.1.8主变压器的冷却方式..........................................................................................103.2电气主接线设计.........................................................................................................113.2.1电气主接线的设计要求......................................................................................113.2.2主接线选择原则..................................................................................................113.2.3电气主接线形式的确定......................................................................................124短路电流的计算................................................................................................................184.1短路的概念及路电流的种类.....................................................................................184.1.1短路的概念..........................................................................................................184.1.2短路电流的暂态过程和短路电流种类..............................................................184.2短路电流的计算.........................................................................................................194.3在最大运行方式下的短路电流.................................................................................224.4短路电流计算结果.....................................................................................................295线路保护............................................................................................................................305.1电力系统继电保护的作用.........................................................................................305.1.1电力系统继电保护的基本任务..........................................................................325.1.2对继电保护的基本要求......................................................................................325.2输配电线保护.............................................................................................................325.3线路末端短路电流.....................................................................................................33咸宁学院学士学位论文IV5.4线路保护整定.................................................................