农村低压电网触电电流数字特征描述与分析  

Description and analysis of shock current digital features for low-voltage rural power grid

作　　者：关海鸥[1,2] 郭元建 杜松怀[1] 邵利敏[1] 苏娟[1] 余国太[4] 朱建军[4] 李锐腾[1] 马琳琦[1] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083 [2]黑龙江八一农垦大学信息技术学院,黑龙江大庆163319 [3]中国农业出版社,北京100125 [4]国家电网公司农电工作部,北京100031

出　　处：《中国农业大学学报》2014年第3期202-207,共6页Journal of China Agricultural University

基　　金：国家自然科学基金资助项目(51177165);中央高校基本科研业务费专项资金资助项目(2012YJ112);国家电网公司科技项目(PD17201200033)

摘　　要：为开发新一代农村低压电网剩余电流保护与动作装置,针对生物触电故障的暂态过度过程中总泄漏电流频谱构成的复杂性和不确定性,利用高阶统计量分析检测信号的数字特征,提出了抽取总漏电电流变化过程表征指标的定量描述方法。仿真试验结果分析表明:偏度中出现正偏离和负偏离的样本数占总样本数的比例为52.4%和47.6%,二者中有53.2%改变了触电前偏度值正负方向;触电故障发生时3个计算周期的峭度变化率增大的样本数占总样本数的比例分别为91.7%、7.4%和96.3%;计算信息熵2.25~3.26,相对无故障时,触电故障发生初期信息熵增大的样本数占总样本数在55.0%以上,触电后稳定期增大的样本数占总样本数73.4%以上。高阶统计量的数字特征变化显著,可以描述生物触电故障过程中总泄漏电流数字特征变化趋势与规律。In order to develop a new generation of final residual current protective device which has been widely used in low-voltage rural power grid,and aiming at complexity and uncertainty of constitution for total leakage current spectrum in transient process of biological electric fault,the higher order statistics was used to analysis the digital characteristic of detection signals.The method to describe indicators was proposed for current changing process of total leakage current.The simulation results showed that the total leakage current signal appeared positive deviation was 52.4% through numerical calculation,and the negative deviation was 47.6%.There was 53.2% current signals that changed the positive and negative direction before electric shock.While the electric shock occurred,the variation rate of kurtosis numerical for three accounting cycle were 91.7%、7.4% and 96.3%respectively.Calculating information entropy was between 2.25and 3.26.The entropy was increased 55% at the beginning of the faults of electric shock,and 73.4%during stationary phase after electric shock.Due to the high significance of the digital characteristics of higher order statistics,it could be used to describe the trends and laws of the total leakage current characteristics in biological shock failure process.

关 键 词：农村低压电网 剩余电流保护 触电电流 高阶统计量 

分 类 号：TM774[电气工程—电力系统及自动化]