基于分形理论的剩余电流互感器故障类型判断  

Fault type judgment of residual current transformer based onthe fractal theory

作　　者：贾云翔 迟长春(指导)[1] 耿晋中 JIA Yunxiang;CHI Changchun;Geng Jinzhong(School of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]上海电机学院电气学院,上海201306

出　　处：《上海电机学院学报》2021年第4期211-215,共5页Journal of Shanghai Dianji University

摘　　要：针对如何准确判断剩余电流互感器故障类型问题,以分形理论为理论基础,对剩余电流互感器进行研究。分析了盒维数计算过程,利用Matlab仿真研究了新小波阈值降噪法对信号采集时去噪效果的优化。探讨了在不同故障因素下,通过网格维数计算比较正常与故障状态盒维数,从而归纳出一套以盒维数为主来判别故障类型的方法。研究表明,该方法能够准确判断出剩余电流互感器存在的故障类型。To solve the problem of how to accurately judge the fault types of residual current transformers,the residual current transformers are studied based on the fractal theory.First,the calculation process of the box-counting dimension is analyzed.Second,the new wavelet threshold denoising method is used to optimize the denoising effect of signal acquisition by Matlab simulation.Finally,the comparison of the box-counting dimensions for the normal and the fault states is discussed after the grid dimension calculation under different fault factors.Thus,a set of methods to judge fault types are summarized based on box-counting dimensions.The research shows that this method can accurately identify the fault types of the residual current transformers.

关 键 词：剩余电流互感器 网格维数 新小波阈值降噪法 盒维数 

分 类 号：TM452[电气工程—电器]