摘要
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。
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 algorithra 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 achieve fault location. Relative system models could be built and simulated in Matlab. The following results can be indicated from the simulation： the methods are feasible and effective.
出处
《电力科学与工程》
2010年第2期51-55,共5页
Electric Power Science and Engineering
关键词
小电流接地系统
单相接地
行波测距
小波变换
波头识别
small current grounding system
single-phase grounding
traveling wave location
wavelet transform
wave -head identification
