单片机实现的电力系统零序电流保护VIP免费

┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊┊┊安徽工业大学毕业设计（论文）说明书单片机实现的电力系统零序电流保护┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊┊┊安徽工业大学毕业设计（论文）说明书摘要电力系统继电保护是保证电力系统安全稳定运行、限制电力系统大面积停电事故最基本和最有效的技术手段。根据接地短路时零序电流大小变化作为故障特征量，变压器接地方式、非全相运行、单相自动重合闸等因素对零序电流保护的运行产生重要的影响，必要时需要采取相应闭锁装置。零序电流保护属于小接地电流系统的保护方式，它利用系统发生故障时零序电流比正常运行时大的特点，来实现有选择性地发出信号或瞬时切断主回路电源避免事故的发生。零序电流可以通过对称分量法求得，实际应用时可用电流互感器测得所需分量。本文结合零序电流和单片机的各自优点，阐述和论证电力系统零序电流保护原理以及基于单片机的实现。关键词：继电保护；零序电流；单片机；对称分量法2┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊┊┊安徽工业大学毕业设计（论文）说明书AbstractPowersystemrelayprotectionistoguaranteethesafeandstableoperationofpowersystemanditisalsothemostbasicandthemosteffectivetechnologicalwaytorestrictionsonalargescalepowerblackouts．Accordingtogroundshortcircuit，Transformergroundingmethodthesizechangedofthezerosequencecurrentasfaultcharacteristics,transformergroundingmethod.Theopen-phaseoperationandsingle-phaseautomaticreclosingsuchaszero-sequencecurrentprotectionoftheoperationhaveamajorimpact.Whenit'snecessary,weneedtoadoptcorrespondinglockingdevice.Zero-sequencecurrentprotectionistheprotectionofthesmallgroundcurrentsystem.Itusesthecharacteristicofzerosequencecurrentofthefailuresystembiggerthannormaloperation.Toachieveselectivetransientsignalorcutoffthemaincircuitpowersupply,inordertoavoidaccidents.Zerosequencecurrentcanbeobtainedbysymmetricalcomponentmethod，itcanbemeasuredbythecurrenttransformerinpracticalapplications.Inthispaper,combinedwiththeadvantagesofthezero-sequencecurrentandmicrocontroller,thisdesignfocusesonexplainanddemonstratethepowersystemzero-sequencecurrentprotectionprinciplesandsinglechipmicrocomputer-basedrealizationmethod.Keywords：Relayprotection,zero-sequencecurrent,single-chipmicrocomputer,Symmetricalcomponentsmethod.3┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊┊┊安徽工业大学毕业设计（论文）说明书目录第1章绪论.........................................................11.1引言........................................................11.2课题的研究背景和意义........................................1第2章.电力系统继电保护.............................................32.1电力系统....................................................32.1.1电力系统简介..........................................32.1.2电力系统的组成........................................42.2继电保护....................................................52.2.1电力系统发展简史......................................52.2.2研究现状..............................................62.2.3继电保护的基本原理....................................62.2.4继电保护的组成........................................72.2.5对电力系统继电保护的基本要求..........................82.2.6发展趋势..............................................9第3章电力系统零序电流保护........................................113.1电力系统零序电流...........................................113.1.1零序...