基于高阶矩的泄漏电流信号特性分析方法

Analysis method of the signal characteristics of the leakage current based on higher-order moments

对低压电网发生触电故障时泄漏电流具有复杂性及多样性的问题,文章应用高阶矩的统计量计算方法,分析了泄漏电流与触电电流中直流分量、2~9次谐波分量的时域特征的变化规律,明确了电气信号各分量三阶矩特征存在显著相关性,相关系数平均值最高可达0.903,可实现泄漏电流和触电电流变化特性的定量化表征,能够为提高低压电网供电能力、保障居民用电安全、避免发生电气灾害提供新参考依据。

In order to solve the problem of complexity and diversity of leakage current in the case of electrical failure in low-voltage power network,this paper analyzes the time-domain characteristics of leakage current and direct current component and 2-9 harmonic component in the electrical current by using the statistical calculation method of higherorder moments.It is found that the third-order moment characteristics of each component of electrical signal have significant correlation.The average value of correlation coefficient can reach 0.903.The quantitative characterization of change characteristics of leakage current and electrophoretic current can provide new reference for improving the power supply capacity of low voltage network,ensuring the safety of power consumption and avoiding electric disasters.