【摘要】 针对剩余电流保护装置存在的拒动、误动以及触电电流信号难以提取的问题,提出一种基于混沌信号时域波形包络特征的触电电流混沌检测方法.利用混沌系统对初始条件敏感和对噪声免疫的特性,根据混沌理论,采用矢量分析方法,提出待测信号相位的检测方法;依据混沌系统不同状态时输出x时域波形包络线的差异性,提出将x时域波形极值点序列标准差作为衡量波形包络线波动特征的指标,自动判别混沌系统的临界状态;在此基础上,采用矢量分析方法,提出一种触电电流幅值检测方法.研究结果表明,提出的混沌判据可准确判断系统周期状态和混沌状态,能够从总剩余电流中检测出触电电流信号,平均检测误差仅为4.64%.更多还原

【Abstract】 To solve the problems of residual current protection device with refusing to operate, maloperation and difficult extracting of electric shock current signal, a chaotic detection method of electric shock current was proposed based on time domain waveform envelope characteristics of chaotic signal. Based on the sensitivity of chaotic system to initial conditions and immunity to noise, a phase detection method was proposed by vector analysis according to chaos theory. According to the difference of output x-time-domain waveform envelope in different states of chaotic system, the standard deviation of x-time-domain waveform extreme point sequence was proposed as index to measure the fluctuation characteristics of waveform envelope, and the critical state of chaotic system could be automatically identified. A method of detecting the amplitude of electric shock current was proposed by vector analysis. The results show that the proposed chaotic criterion can accurately judge the periodic state and chaotic state of the system, and the electric shock current signal can be detected from the total residual current with average error of 4.64%.更多还原