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1、摘要在现代电网中，随着超高压、大容量、远距离输电线路的不断增多，对电力系统的安全稳定运行提出了更高、更严格的要求。距离保护作为线路保护的基本组成部分，其工作特性对电力系统的安全稳定运行有着直接和重要的影响。为了适应现代超高压电网稳定运行的要求，微机保护装置在硬件和软件上都提出了越来越高的要求。本文首先介绍了微机继电保护装置的发展现状和趋势，阐述了继电保护的一般性原理、分类以及电力系统对继电保护装置的基本要求。在总结了输电线路微机距离保护研究现状的基础上，分析了国内现有微机保护硬件的现状，对比了8位、16位单片机以及DSP的保护方案，并总结了其优缺点，提出了一种基于
2、ARM微处理器的保护方案。本装置以广州周立功单片机发展有限公司生产的DEVICEARM2200工控板作为保护CPU，主要负责控制数据采集、采样数据处理、实现保护功能、人机界面以及外围串口和以太网通信等，再配合其它器件实现采样保持、多路选择择开关和开关量输入输出的控制。本文实现了微机保护方案的硬件设计，完成了处理器外围电路和采样电路环节的设计。关键词：微机距离保护；硬件平台；DEVICEARM2200VABSTRACTInthemodernpowernetwork,thesecurityandstabilityduringpowersysterm’soperatin
3、gisrequiredhigherandmorestrictly,withtheraisingoftheextra-high-pressure,high-capacityandlong-distancepowertransmissionline.Distancerelayisrheprimaryclementofthetransmissionlineprotection,theperformancecharacteristicofwhichhasadirectandvitalaffectonthesecurityandstabilityduringpowersys
4、term’soperating.Foradaptingtorequirementforworkingstablyinthemodemextra-high-pressurepowernetwork,microprocessor-baseddistancerelaysarerequiredhigherandhigheronnotonlyhardwarebutsoftware.Firstly,thedevelopmentstatusandtrendofmicroprocessor-basedrelayprotectiondevicewereintroduced.Expa
5、tiatedthegeneralprinciple,sortandrequirementtorelayprotectiondeviceofpowersystemofrelayprotection.Onthebaseofgeneralizingtheexistingconditionofmicroprocessor-baseddistancerelaysatthepowertransmissionline,thissubjectanalyzedtheexistingconditionofthehardwareofdistancerelays,compared8-bi
6、t,16-bitSCMand32-bitDSPprotectionscheme,andgeneralizedtheremeritsanddemerits,thengaveaschemeofrealaysbasedonARMprocessor.ThedeviceusedDEVICEARM2200madebyZhouligongcompanytobetheprotectiveCPU,whichmainlyansweredforcontrollingdataacquisition,thesampleddataptocessing,theptotectivefunctio
7、nimplementation,thehumanmachineinterface(HMI)andperipheralserialinterfaceandEthernetcommunication,andusedotherdevicestobeassistanttocontrolsampling/holding,multi-pathoptionswitchandtheI/Oswitchingvalue.Thesubjectrealizedthehardwaredesignofthemicroprocessor-basedprotectionscheme,andcom
8、plete
