基于小波变换的小电流接地选线研究  

Study on Low Current Grounding Fault Line Selection Based on Wavelet Transform

作　　者：魏圣泰 翁玉翔 WEI Shengtai;WENG Yuxiang(State Grid Jiangsu Electric Power Company Jingjiang Power Supply Company,Jingjiang 214500,Jiangsu,China;State Grid Jiangsu Electric Power Company Taizhou Power Supply Company,Taizhou 225300,Jiangsu,China)

机构地区：[1]国网江苏省供电公司靖江供电分公司,江苏靖江214500 [2]国网江苏省供电公司泰州供电分公司,江苏泰州225300

出　　处：《电气传动自动化》2023年第6期79-83,共5页Electric Drive Automation

摘　　要：针对小电流接地系统,提出了一种基于小波变换的自适应故障选线方法。首先,利用小波包分解两个周期的暂态零序电流(TZSC),然后引入综合变换值来描述故障信息;其次,对综合变换值进行归一化,计算故障隶属度值;最后,根据最大隶属度值与第二最大隶属度值的差异,输出选定的故障线路。仿真结果表明,该方法不受故障线路类型、故障电阻和故障初相角的影响,具有良好的抗噪声能力。An adaptive fault line selection method based on wavelet transform is proposed for small current grounding system.First,the transient zero-sequence current(TZSC)of two cycles is decomposed by Wavelet packet decomposition,and then a synthetic singular value is introduced to describe the fault information.Secondly,the singular value is normalized and the fault membership degree is calculated.Finally,according to the difference between the maximum membership value and the second maximum membership value,the selected fault line is output.The simulation results show that the method is not affected by fault line type,fault resistance and fault initial phase angle,and has good anti-noise ability.

关 键 词：小电流接地 小波变换 故障选线 暂态电流 

分 类 号：TM827.8[电气工程—高电压与绝缘技术]