福州大学2013届毕业设计论文过渡电阻对不同特性阻抗继电器的影响分析指导教师：姓名：学院：班级：时间：联系方式：第1页共31页摘要距离保护用电压与电流的比值（即阻抗）反映保护安装处到短路点距离的远近构成的继电保护，又称阻抗保护。与电流保护和电压保护相比，距离保护的性能受系统运行方式的影响较小。但故障输电线路中存在较大的过渡电阻时，很容易引起距离保护拒动或误动。本文介绍了距离保护的基本知识，分析了过渡电阻分别针对单电源、双电源线路距离保护中采用的不同阻抗继电器特性，并用MATLAB对电力系统运行及故障进行仿真分析，得出过渡电阻对保护的影响及消除其影响的有效措施。关键词：距离保护MATLAB仿真阻抗继电器过渡电阻第2页共31页AbstractDistanceprotectionwiththeratioofvoltageandcurrent(i.e.,impedance)reflecttheprotectioninstalledplacetoshort-circuitpointofdistancerelayprotection,alsoknownastheimpedanceprotection.Comparedwiththecurrentprotectionandvoltageprotection,distanceprotectionperformanceinfluencedbysystemoperationmodeissmaller.Butwhenthereisalargertransitionresistancefaultintransmissionline,itiseasytocausedistanceprotection.RefusingactionanderroractionThispaperintroducesthebasicknowledgeofthedistanceprotection,transitionresistancewereanalyzedrespectivelyforsinglepowersupply,powersupplycircuitadoptsdifferentimpedancerelayindistanceprotectionfeatures,anduseMATLABsimulationanalysisofpowersystemoperationandfault,theeffectoftransitionresistancefortheprotectionandtheeffectivemeasurestoeliminateitseffects.Keywords:DistanceprotectionMATLABsimulationImpedancerelayTransitionresistance第3页共31页目录摘要.............................................................................................................................................................2Abstract........................................................................................................................................................3前言.............................................................................................................................................................5第一章电网的距离保护.............................................................................................................................71.1距离保护的基本概念....................................................................................................................71.2距离保护的时限特性....................................................................................................................71.3距离保护的组成............................................................................................................................81.3.1起动元件......................................................................................................................81.3.2方向元件......................................................................................................................81.3.3距离元件......................................................................................................................91.3.4时间元件......................................................................................................................91.4阻抗继电器..................................................................................................................................9第二章仿真软件...........................................................................................................
