雷电流流经故障垂直接地体时暂态阻抗的时域分析  

Time-Domain Analysis of Faulted Vertical Grounding Electrode's Transient Resistance under Lightning Current

作　　者：邓慧都 周力行[1] 何腾芳 钟笑拳 赵宪[1] 陈萌[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《电瓷避雷器》2014年第2期60-65,共6页Insulators and Surge Arresters

摘　　要：为了研究垂直接地体发生故障后对暂态接地阻抗的影响,笔者以接地体表面有细缝和局部腐蚀两种状态模拟故障接地体。运用时域有限差分(FDTD)法,通过Matlab编程实现对垂直接地体发生不同故障类型和故障点到接地体入地端的距离与暂态接地阻抗的变化规律的分析。分析结果表明:垂直接地体表面有细缝和局部腐蚀时暂态阻抗大于正常时的值;故障点和垂直接地体入地端之间的距离与暂态阻抗值的变化量成反比关系;在雷电流快速泄流的过程中故障接地体暂态阻抗的变化最显著。研究结论为防雷接地设计,接地体腐蚀状态检测提供了理论依据和实践参考。In order to study the impacts of faulted vertical grounding electrode on transient grounding resistance, the author uses thin-slot on the surface of the electrode condition and localized corrosion condition to simulate a faulted electrode. By finite-difference time-domain method, using Maflab program language, analyzes the transient grounding resistance changes at different fault types and different distances between trouble spots and the top of the vertical electrode. Through analysis of research, the transient resistances are larger than normal both a thin-slot on the surface of the vertical grounding electrode and the electrode suffered local corrosion. The distance between a trouble spot and the top of the vertical grounding electrode is inversely related to the change of transient resistance. The most visible change of grounding electrode detection.

关 键 词：故障接地体 雷电流 暂态接地阻抗 FDTD Matlab UPML 

分 类 号：TM862.3[电气工程—高电压与绝缘技术]