电网的距离保护设计-本科毕业设计论文

本科毕业设计（论文）电网的距离保护设计学院专业电气工程及其自动化年级班别学号学生姓名指导教师年月日1摘要电力系统的快速发展对继电保护不断提出新的要求，特别是在高压且复杂的电网中，各种保护都具有其重要性。距离保护作为一种性能较完善的保护装置，它可以应用在任何结构复杂、运行方式多变的电力系统中，能有选择行的、较快的切除相间故障。根据继电保护装置在电力系统中的应用，本设计详细介绍了220kv高压电网中距离保护的整定配置。首先，本文将概述本课题将要研究的电网，并利用PSASP电力系统综合分析程序绘制电网图和计算出参数，以及作整定计算的准备工作。其次，本文将简要叙述潮流分布计算的结果以及短路电流的举例计算，为距离保护的整定计算作好准备。本文将详细阐述距离保护的原理、配置的基本原则以及计算原则，并对本课题研究的电网中各线路进行整定计算分析。最后，本文将详细阐述距离保护的原理、配置的基本原则以及计算原则，并对本课题研究的电网中各线路进行整定计算分析。关键词:潮流分布，短路电流计算，距离保护，整定计算AbstractPowersystemfortherapiddevelopmentofprotectionhavemadenewdemands,particularlyinthehigh-pressureandcomplexnetwork,protectionwithitsownimportance.Distanceprotectionasabetterperformanceoftheprotectiondevice,itcanbeappliedtoanycomplexstructure,changingmodeofoperationoftheelectricitysystem,willbeabletochoosethetime,withafasterphasetophasefault.Undertheprotectiondeviceinthepowersystem,theapplicationThedetaileddesignofa220kvhighvoltagepowernetworkprotectionfromtheconfigurationsetting.Firstofall,thepaperwilloutlinethetopicstobestudiedwillbethepowergrid,PSASPandusepowersystemanalysisproceduresmappinggridmapandcalculateparameters,andthesettingforthepreparatorywork.Secondly,thepaperwillelaborateontheprincipleoftheprotectionofdistance,thedistributionofbasicprinciplesandcalculatingprinciple,aswellasthestudyofthesubjectlineofthePowerGridforsettinganalysis.Finally,thepaperbrieflydescribesthetrendofdistributedcomputing,andtheresultsofshort-circuitcurrentexamples,distanceprotectionforthesettingready.Keyword:short-circuitcurrentcalculation,thetrendofdistributedcomputingcalculationDistance,protection,setting1目录1绪论................................................................................................................................11.1本课题研究背景及意义..............................................................................................11.2距离保护的研究现状..................................................................................................11.3论文的主要工作..........................................................................................................22电网距离保护整定计算的准备工作.................................................................................32.1本课题研究的电网概述..............................................................................................32.2整定计算的工作步骤..................................................................................................42.3电网的原始数据..........................................................................................................42.3.1220kv的电网图..................................................................................................42.3.2系统各元件的参数............................................................................................63电网潮流分布和短路电流计算.........................................................................................83.1系统潮流分布计算......................................................................................................83.1.1变压器中性点接地的选择................................................................................83.1.2潮流分布结果....................................................................................................83.2短路电流计算...............................................................................................................83.2.1短路计算的假设条件........................................................................................83.2.2运行方式的确定原则........................................................................................93.2.3系统的运行方式................................................................................................93.2.4短路电流计算举例..........................................................................................104电网距离保护的整定计算................................................................................................164.1距离保护的概述........................................................................................................164.1.1距离保护的概念..............................................................................................164.1.2距离保护的应用..............................................................................................164.2距离保护的原理........................................................................................................174.2.1距离保护的作用原理......................................................................................174.2.2距离保护时限特性..........................................................................................194.2.3距离保护的接线方式......................................................................................204.2.4距离保护定值配合的基本原则......................................................................2524.3距离保护的整定计算................................................................................................254.3.1距离保护的整定计算原则..............................................................................254.2.2分支系数的产生分析及计算..........................................................................294.3.3相间距离整定计算............................................................................