小电流接地系统单相故障的Matlab仿真  

Matlab Simulation on Single-phase-to-earth Fault of Small Current Grounding Power System

作　　者：周羽生[1] 彭琢[1] 韦肖燕[1] 邝江华[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410076

出　　处：《电力系统及其自动化学报》2009年第4期50-52,99,共4页Proceedings of the CSU-EPSA

基　　金：湖南省自然科学基金项目(07JJ3101);湖南省科技计划项目(2007FJ3008)

摘　　要：小电流接地系统发生单相接地故障导致非故障相电压升高,为防止进一步扩大成两点或多点接地甚至相间短路,应及时采取措施消除该故障。文中利用Matlab对中性点不接地系统单相接地故障进行仿真,重点探讨了仿真模型的搭建过程;通过对各线路零序电流波形的分析,判断出故障线路;通过对故障线路三相电压、电流波形的分析,判断出接地相。该方法简单、准确、可靠,较好解决了中性点不接地系统单相接地问题。The single-phase grounding fault happens in the small current grounding power system, the voltage of unfault phase will jump higer In order to prevent the fault from enlarging two pots＇ or more pots＇ grounding fault or even short-circuit betweem phases,action should be taken to eliminate the fault in time. In this paper, using matlab to simulate single-phase to-earth fault of the neutral ungrounding power system ,by analyzing zero sequence current of each line, the fault line is judged by analyzing three-phase voltage.three-phase current of fault line, the fault phase is judged. The method is simple, exact and reliable, which well solves single-phase grounding fault of the neutral ungrounding power system.

关 键 词：小电流接地系统 仿真 零序电流 三相电压 三相电流 

分 类 号：TM743[电气工程—电力系统及自动化]