35KV线路保护装置设计毕业论文

I摘要现代电力系统中，继电保护装置是保证电力系统安全运行和提高电能质量的重要工具。随着变电站综合自动化技术的发展及其推广应用，微机保护装置已成为电力部门的普遍要求。本文的主题是35KV线路保护装置设计，首先介绍了研究该装置的目的和意义、国内外的发展情况，并详细介绍了保护装置的原理与算法。随后，本文详细介绍了装置所采用的单片机（AT89C52）和各辅助芯片的功能作用，以及相关电路的设计。本装置硬件包括数据采集系统、开关量输出电路、键盘显示电路、通讯电路以及供电电源等。最后，针对本文的硬件编写了系统的软件部分，包括按键和液晶显示系统软件、串口通讯软件和保护功能程序软件，实现了对35KV线路的三段式过电流保护和方向电流保护功能。关键词微机保护线路保护单片机IIAbstractInthemodernpowersystem,protectiverelayingequipmentisofimportancetoguaranteethesafetyofthesystemoperationandimprovepowerquality.Withthedevelopmentoftheintegratedautomationtechnologyofsubstationsanditsapplication,microcomputerprotectioninstallationhasbecometheuniversaldemandtothepowersector.Thethemeofthispaperisaboutthedesignof35KVlineprotectionofthedevice,firstlyitintroducesthepurposeandmeaningofthisresearchonthedevice,thedevelopmentbothathomeandabroad,andtheprincipleandalgorithmoftheprotectivedevice.Then,itintroducesthefunctionsofthesinglechipmicrocomputer(AT89C52)andeachcompanionchipusedbythedevicerelatingtoitscircuitdesign.Thehardwareincludesdataacquisitionsystem,switchingoutputcircuit,keyboarddisplaycircuit,communicationcircuit,powersuppliesandsoon.Finally,thesoftwaresystemwhichiswrittenaccordingtointhispaperthehardwareofwrittenpartsincludesthekeysandliquidcrystaldisplaysystemsoftware,serialcommunicationsoftwareandprotectionfunctionprogramsoftware,thusrealizingthethree-stepovercurrentprotectionandthedirectionofcurrentprotectionfunctionofthe35KVlines.KeywordsMicrocomputerprotectionLineprotectionSinglechipmicrocomputerIII目录摘要....................................................IAbstract.................................................II第1章绪论...............................................11.1研究的目的和意义...................................11.2国内外发展情况.....................................21.3本文的主要内容.....................................4第2章线路保护装置的原理与算法...........................52.1线路保护基本原理..................................52.1.1三段式过电流保护.............................52.1.2方向电流保护................................162.2微机保护算法.....................................22第3章系统硬件电路设计..................................263.1主控制器.........................................273.2模拟量采样电路...................................283.2.1电流互感器..................................283.2.2电压互感器..................................293.2.3低通滤波电路................................313.2.4功率因数测量电路............................333.3采集电路.........................................343.4输出及报警电路...................................353.4.1开关量输出电路..............................353.4.2报警电路....................................36IV3.5键盘电路.........................................373.6LCD显示电路......................................383.7通讯电路.........................................393.8供电电源.........................................403.8.1微处理器供电电路............................403.8.2放大器供电电路..............................41第4章系统软件设计......................................434.1软件系统构成.....................................434.2监控系统设计.....................................444.2.1监控系统实现的功能..........................444.2.2监控系统程序设计............................444.3串口通讯软件设计.................................464.3.1串口通讯的功能..............................464.3.2串口通讯编程................................464.4保护功能程序设计.................................474.4.1数据采集系统软件设计........................484.4.2故障处理系统软件设计........................51结论...................................................52致谢...................................................53参考文献.................................................54附录1...................................................56附录2...................................................57VCONTENTSAbstract..........................................................................................IAbstract.........................................................................................IIChapter1Introduction....................................................................11.1Theaimandmeaningoftheresearch.....................................11.2Thedevelopmentondomesticallyandabroad........................21.3Themaincontent..................................................................4Chapter2Theprinciplesandalgorithmsoflineprotectivedevices.52.1LineprotectivedevicesFundamentals...................................52.1.1Three-phasecurrentprotection.....................................52.1.2Directionalcurrentprotection....................................162.2Microcomputer-basedprotectionalgorithms........................22Chapter3Thehardwarecircuitdesignofsystem..........................263.1HostController..................................................................273.2Analogsamplingcircuit......................................................283.2.1CurrentTransformer..................................................283.2.2Potentialtransformer.................................................293.2.3Low-passfiltercircuit...............................................313.2.4Powerfactormeasurementcircuit..............................333.3Dataacquisition..............