接地网拓扑结构的组合源磁场叠加成像检测方法

Combined source magnetic field superposition imaging detection method for grounding grid topology

现有研究中常通过电磁感应方法探测接地网拓扑结构,针对该方法弱磁场测量困难,提出了一种组合源磁场叠加成像检测方法。通过多根引下线向接地网周期性轮换注入电流,不同注入方式使电流在接地网中呈现不同流向,保证了接地网不同区域载流导体都能激发有效测量磁场,结合二次开发的超宽带定位系统实时定位阵列式传感线圈测量位置,实现了对地表水平x、y方向感应磁场的扫描式测量,最后采用形态学滤波方法消除异常数据干扰,进而通过Canny边缘检测算子进行接地网拓扑提取。仿真与实验结果表明:文中所述方法能够有效提高接地网拓扑结构的成像效果,接地网网格导体定位精度误差不高于3%。

In response to the challenge of measuring weak magnetic field,this paper introduces a novel detection method,combining source magnetic field superposition imaging.The approach involves injecting current into the grounding grid through multiple down conductors in periodic rotation,each inducing different flow directions within the grounding grid.This variation ensures effective stimulation of measurement magnetic fields across different areas of the grounding grid.Integrated with an ultra-wideband positioning system,the method enables real-time location tracking of array sensing coil measurements in both x and y directions on the surface level.The induced magnetic field is scanned and abnormal data interference is eliminated using morphological filtering and Canny edge detection.Simulation and experimental results show that the proposed method effectively improve the imaging quality of grounding grid topology.Moreover,the positioning accuracy error for grounding grid conductors remains below 3%,validating the effectiveness of the proposed method.