基于磁性源的接地网拓扑结构检测方法研究  

Research on Detection Method of Grounding Grid Topology Based on Magnetic Source

作　　者：李波 王秀娟[2] 张林山 曹敏 胡凡君 付志红[2] 朱全聪 Li Bo;Wang Xiujuan;Zhang Linshan;Cao Min;Hu Fanjun;Fu Zhihong;Zhu Quancong(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd,Kunming,Yunnan,650217;Chongqing University,Chongqing,400000)

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217 [2]重庆大学,重庆400000

出　　处：《云南电力技术》2020年第5期2-5,16,共5页Yunnan Electric Power

摘　　要：接地网长期处于地下环境中,因腐蚀变细甚至断裂直接影响接地网的性能。接地网的拓扑结构可以反映接地网的状态,为接地网的检修、施工、验收提供重要的技术支撑,具有重要工程应用价值。本文提出了一种基于电磁感应原理的接地网断点诊断方法,检测装置由一个发射线圈和两个接收线圈组成。通电发射线圈会在周围空间产生一次交变磁场,在一次磁场的激励下,接地网导体中会产生感应电流,感应电流进一步产生感应电磁,称为二次磁场,二次场反映了接地扁钢的位置信息。利用接收线圈的合理配置,对接地网导体中感应电流产生的二次交变磁场进行检测,进而得到接地网扁钢的位置及其走向。如果接地网导体存在断点,则流过的感应电流值很小,该感应电流在地表产生的二次交变磁场同样很小,以此可作为接地网断点存在的判据。利用通电CDEGS软件对提出的方法进行了仿真验证,并对真实的接地网进行了试验,结果表明该方法可以有效对接地网的拓扑结构进行检测。The grounding grid buried in the soil environment for a long time faces corrosion loss and even breaks,thereby reducing the discharge performance.The topological structure of the grounding grid can provide important technical support for the maintenance,construction,and acceptance of the grounding grid,thereby it has important engineering application value.This paper proposes a grounding grid structure diagnosis scheme based on a two-dimensional electromagnetic induction device,which consists of a transmitter coil and two receiver coils.The transmitter coil will generate an alternating magnetic field.Under the excitation of this primary magnetic field,the induced current will be generated in the grounding grid,and will further generate the induced electromagnetic field,which is called the secondary field.The secondary field reflects the structure information of the grounding grid.Use the receiver coil to collect the secondary field response,and then analyze the structure information of the grounding grid.In particular,if there is a breakpoint in the grounding grid,the nearby induced current value will be very small,and the corresponding secondary field is also weak.This phenomenon can be used as a diagnostic basis for the grounding grid breakpoint.The proposed method was verified by simulation using CDEGS software and tested on a real grounding grid.The results show that this method can effectively detect the topology of the grounding grid.

关 键 词：接地网 拓扑结构 电磁成像 二次磁场 耦合模型 

分 类 号：TM74[电气工程—电力系统及自动化]