变电站接地网导体埋深检测方法与技术

Method and technology of testing the buried depth of conductors of substations’grounding grids

为了获得变电站接地网导体的实际埋设深度(埋深),通过对变电站接地网注入一定频率的励磁电流,利用电磁感应方法测量地表面两个不同位置的磁感应强度,根据两个磁场与测点的位置信息,得到接地网导体的具体埋设深度。理论分析了检测方法的可行性,设计研制了检测装置,实验室实验和站内现场试验测试,验证了方法的正确性。理论分析和测试结果表明,该技术方法操作简便、检测结果准确可靠,可以用于接地网运检维护的工程实际,也体现了物理学和电路理论在工程技术领域的具体应用.

In order to get the reality buried depth of conductors of substation’grounding grids,an exciting current of a definite frequency is injected directly into grounding grid by two ground lead wires.Then,the surface magnetic induction intensities of different places are measured based on the electromagnetic induction theory.We can obtain the practical buried depth of grounding grids by information of the magnetic fields and the place of measuring point places.The feasibility of the testing method is analyzed and the injecting apparatus are designed and developed.The correctness of the method is verified by laboratory experiments and field tests in substation.The results of theory analysis and measuring show that the technology method is operated easily and the measuring results are accurate and reliable.It can be used in the engineering practice of transport inspection of grounding grids.It shows that the theory of physics and circuit can be used to engineering technology.