基于工频磁场的电缆路径定位及其影响因素分析

Analysis of cable path location and its influencing factors based on power frequency magnetic field

为避免城市施工过程中挖断电缆事故的频繁发生,需要科学合理地对电缆路径实施定位。以三芯电缆为研究对象,引入定位特征点和定位特征值K作为电缆上方磁感应强度判断依据,并根据电缆周围磁场分布特性确定电缆敷设路径;接着用该判据对影响检测点周围磁场环境变化的因素——线芯位置、电缆埋深、敷设间距和不同路径等进行分析论证。仿真结果表明:定位特征值K能较好地反应电缆周围磁场环境变化,定位特征点均出现在电缆正上方附近。最后,通过有限元和实验验证该判据的准确性和可行性,原理简单且可移植性强,可以为实现智能化和现代化的电缆路径定位提供重要参考。

In order to avoid the frequent occurrence of cable cutting accidents in urban construction,the cable path should be located scientifically and reasonably.Taking three core cable as the research object,locating characteristic point and locating characteristic value K are introduced as the judgment basis of magnetic induction intensity above the cable,and the cable laying path is determined by the distribution characteristics of magnetic field around the cable.Then,the factors affecting the change of magnetic field around the detection points-wire core position,cable buried depth,laying spacing and different paths are analyzed by using this criterion.Simulation results show that the value of K can reflect the change of magnetic field environment around the cable well.The characteristic points appear near the top of the cable.Finally,the accuracy and feasibility of the criterion are verified by finite element and experiments.The principle of the proposed method is simple and portable,which provides an important reference for realizing intelligent and modern cable path positioning.