配电网单相接地故障的仿真分析  

Simulation and Analysis of Single-phase to Ground Fault in Distribution Networks

作　　者：王艳松[1] 解飞[1] 

机构地区：[1]中国石油大学信息与控制工程学院,东营257062

出　　处：《高电压技术》2008年第1期123-127,153,共6页High Voltage Engineering

基　　金：中国石油大学博士基金(Y050503)~~

摘　　要：为了提取配电网单相接地故障选线和故障测距的暂态故障特征量,基于Matlab的Simulink仿真环境,搭建了小电流接地系统的配电网络仿真模型并综合考虑不同短路时刻、不同接地电弧电阻、不同故障距离和线路长度等多个因素,对配电网小电流接地系统的单相接地故障进行了大量仿真。在配电网单相接地短路故障后的第1个工频周波(0～0.02s)内故障线路的零序电流包络线的变化速度比非故障线路变化缓慢,包络面积大,但与非故障线路首半波极性相反。仿真分析表明此暂态特性不受短路时刻、电弧电阻、故障距离和消弧线圈被偿度的影响,为单相接地故障选线和故障测距的研究提供了理论依据。The transient characteristic of single-phase to ground fault is used for the fault line selection and fault distance detection in distribution network. The distribution network simulation model is established for the Neutral Uneffectual Grounded System （NUGS）, based on the Simulink of Matlab. Various factors, such as different short circuit time, arc-resistances, fault distances, line length and the compensation rates of arc-suppression coil, should be put into overall consideration. The single-phase to ground fault of the NUGS is simulated so as to research the transient characteristics of single-phase to ground fault in distribution network. Through analyzing these transient characteristics such as zero-sequence current and voltage, fault-phase voltage and current, it is concluded that these transient characteristics change with the different short circuit time, arc-resistances, fault distances and the compensation rates of arc-supperession coil, which provide a theory basis to study the fault line selection and fault distance detection for the single-phase to ground fault in distribution network.

关 键 词：配电网 仿真模型 零序电流 单相接地故障 补偿度 故障相电压 

分 类 号：TM862[电气工程—高电压与绝缘技术]