小电流接地选线分析

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1、…………………….……………….…………………山东农业大学毕业论文小电流接地选线分析院部机械与电子工程学院____专业班级电气工程及其自动化班届次__________学生姓名__________学号__________指导教师_____年月日装订线……………….…….………….………….………28目录目录1摘要3Abstract3绪论31小电流接地选线方法研究的历史及现状介绍31.1国外研究概况31.2国内研究现状32 故障现象分析与判断33典型的小电流接地系统发生单相接地故障时选线方法33.1基于零序电流基波的选线方法33.1.2谐波分量法33.1.3利用接地故障暂态过程的选线法3

2、3.1.4基于最大∆(IsinΦ)原理的选线方法33.1.5有功分量法33.2不利用故障零序电流来选线33.2.1拉线法33.2.2“S注入法”33.2.3注入变频信号法34各种小电流接地选线方法的优缺点分析35 单相接地故障的处理步骤36 处理单相接地故障的要求37仿真模型37.1接地电阻为100时37.2接地电阻为400时3结论3参考文献3致谢328ContentsAbstract3Introduction31Thehistoryandpresentsituationofsmallcurrentgroundinglineselection51.1Foreignresearchsu

3、rvey51.2Domesticresearchstatusquo62 Faultphenomenonanalysisandjudgment73Atypicalsmallcurrentgroundingsystemfortheoccurrenceofsingle-phase83.1Themethodofselectinglinebasedonzerosequencecurrent83.1.2Harmoniccomponentmethod103.1.3Themethodofselectingthefaulttransientprocessofthegroundingfault113.1

4、.4Basedon∆(IsinΦ)lineselectionmethod113.1.5Activecomponentmethod[16]123.2Donotusefaultzerosequencecurrenttoselecttheline123.2.1Pullmethod123.2.2“SInjectionmethod”133.2.3Injectionfrequencyconversionsignalmethod134Theadvantagesanddisadvantagesofvarioussmallcurrentgroundinglineselectionmethod35 Tr

5、eatmentstepofsinglephasetogroundfault36 Therequestfordealingwiththesingle-phasegroundingfault3Reference3Conclusion3Thank328小电流接地选线分析（山东农业大学机械与电子工程学院）摘要：我国的中压电网基本上都是小电流接地系统，单相接地故障率最高,因此如何检测并隔离接地故障线路，成为配电自动化的一个重要研究课题.就小电流接地系统发生单相接地故障的十余种故障选线方法分析了其原理及各自相应的特点,为小电流接地系统实现配电自动化提供了重要依据。关键词：小电流接地系统单相接地故

6、障选线零序电流消弧线圈28AnalysisofsmallcurrentgroundinglineselectionHuichaoLiu(Mechanical&ElectricalEngineeringCollegeofShandongAgriculturalUniversity,Tai’an,Shandong271018)AbstractThemediumvoltagepowernetworkbasicallyisinsmallcurrentneutralgroundingsystem,single-phasegroundingfaultrateisthehighest,sohowt

7、odetectandisolatethefaultline,hasbecomeanimportantissueinthestudyofdistributionautomation.Onthesmallcurrentgroundsystemsinglephasetogroundfaultoccursinmorethantenkindsoffaultlineselectionmethodanalysistheitsprincipleandtheirrespec