基于DWT的煤矿系统单相接地故障选线方法

Line selection of single phase grounding fault in mine system based on DWT

为解决煤矿小电流接地系统中单相接地故障选线准确性较差的问题,提出了一种基于小波分析和相关性计算的小电流接地故障选线的方法。利用DWT分解故障零序电流,提取故障特征分量,通过小波系数矩阵和相关性计算构造选线判据,表征各出线特征量的差异,完成选线。结果表明,与传统选线算法相比,该方法能够克服煤矿小电流接地系统的恶劣环境,仿真实验中选线准确率可达97%以上,提高了选线准确性。

This paper proposes a method of small current landing fault line selection based on small wave analysis and calculation related to solve the problem of poor accuracy of single-phase landing fault selection in small current connection system in the coal mine.The study involves decomposing the zero order current using DWT;extracting the fault feature component;calculating the constructor selection judgment through the small wave coefficient matrix and correlation;characterizing the difference of the characteristic qualities of the outgoing lines,and complete the line selection.The simulation results show that compared with the traditional line-selection algorithm,this method can overcome the harsh environment of the small current system in coal mines.The accuracy of the line selection in the simulation experiment can reach over 97%,which improves the accuracy of the line selection.