基于六线圈的地下电力电缆定位技术研究

A novel underground cable positioning system based on six induction coils

针对现有地下电力电缆定位系统的不足,结合市场和检测现场的需求,介绍了一种地下电缆定位系统线圈排布的原理及实现方法。基于电磁感应原理设计一种具有6个感应线圈的信号接收器,针对待测现场电力电缆工作状态的未知性,对运行的电力电缆在不影响正常工作的情况下直接检测工频磁场信号,对没有运行的电力电缆则检测通过发射机注入的特定频率电流产生的磁场信号,建立了六线圈地下电缆路径和埋深判断的理论模型,推导了检测信号与电缆相应路径位置、埋深的理论公式,并用Maxwell仿真软件进行了仿真,实现了对地下电缆的路径走向的判定,避免了交叉电缆的误判,同时实现了对电缆埋深的探测,且地下电缆探测深度的相对误差μ仅为3.469%。

In view of the shortcomings of the existing underground power cable positioning system, combined with the requirements of the market and the detection site, this paper introduces the principle and implementation method of the coil arrangement of the underground cable positioning system. Based on the principle of electromagnetic induction, a signal receiver with six induction coils is designed. In view of the unknown working state of the field power cable to be tested, the power frequency magnetic field signal can be directly detected without affecting the normal operation of the power cable, for the power cable without operation, the magnetic field signal generated by the current injected by the transmitter at a specific frequency is detected, and the induced electromotive force of each coil is compared and calculated to determine the distribution direction of the cable and calculate the buried depth and current of the cable. Finally, the path direction of the underground cable is determined, and the compass function can accurately determine the actual direction of the cable, avoid the wrong judgment of the cross cable, and realize the detection of the buried depth of the cable, the relative error of the detection depth of the underground cable is only 3.469%.