小电流接地系统行波测距方法研究

以行波测距法应用到小电流接地系统的故障测距中为背景,对单端测距算法和双端测距算法进行了比较并改进了单端测距算法。利用电流行波进行相模变换,并对其进行二进小波变换。根据小波变换的奇异性理论检测初始行波、故障点反射波及故障点经对端母线反射波波头的到达时刻,进而计算出故障距离,实现故障测距。在Matlab环境下建立了相关模型并进行了仿真验证。仿真结果表明:利用电流行波的小波变换实现小电流接地系统单相接地故障测距是合理且可行的。

Methods of Traveling Wave Fault Location in Small Current Grounding System

The method of traveling wave fault location was applied for the small current grounding system fault location in this paper,the single-terminal fault location algorithm and two-terminal fault location algorithm were compared and single-terminal fault location algorithm was improved.The current traveling wave was transformed in phase-model and wavelet.The moment of the first there wave-head is identified by the theory of wavelet singularity detection,and then the fault distance is calculated in order to achi...