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接地网是发电站、变电站和输电塔安全稳定运行的重要保证，在对已有接地网进行腐蚀诊断和新建接地网验收时，均需要准确的接地网结构检测信息但传统接地网结构检测方法多存在工作量大、效率底、精确度差的问题。为实现接地网的高效、精细探测，基于磁场补偿原理进行了共面补偿瞬变电磁法的研究。首先，通过理论推导完成了共面补偿瞬变电磁法的一次场和二次场计算，确定了零磁通位的存在，结果表明增加补偿线圈后，地下1 m深度处有效磁场强度仍大于单线圈磁场强度的75%,在不显著降低探测深度的前提下，将浅部探测盲区降低到小于0.2 m。然后，针对0.2～0.8 m埋深接地体进行了正演模拟和物理模型试验，实验结果表明接地体横向定位精度准确，纵向定位精度误差小于0.05 m,证明了共面补偿瞬变电磁法在接地体检测中的有效性和准确性，为接地网精细探测提供了新思路和新方法。
Abstract：The grounding grid is an important guarantee for the safe and stable operation of power plants, substations and transmission towers, and accurate structure inspection information of grounding grid is required both for corrosion diagnosis of existing grounding grids and for acceptance of newly built grounding grids. However, traditional grounding grid structure detection methods are characterized by large workloads, low efficiency and poor accuracy. In order to realize efficient and precise detection of grounding grid, the research of coplanar compensation transient electromagnetic method was carried out based on the principle of magnetic field compensation. Firstly, the primary and secondary field calculations of coplanar compensated transient electromagnetic method are completed through theoretical derivation, and the existence of zero magnetic flux level is confirmed. The results show that the effective magnetic field strength at the depth of 1 m underground is still greater than 75% of that of a single coil after adding the compensation coil, and the shallow detection blind area is reduced to less than 0.2 m without significantly lowering the detection depth. Then, the orthogonal simulation and physical modeling tests were carried out for grounding bodies buried at depths of 0.2～0.8 m. The experimental results show that the horizontal positioning of the grounding body is accurate, and the vertical positioning accuracy error is less than 0.05 m. It proves the effectiveness and accuracy of the coplanar compensation transient electromagnetic method in the detection of the grounding body, and provides new ideas and methods for the fine detection of the grounding grid.
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基本信息:
中图分类号:TM862;P631.325
引用信息:
[1]吴德勇,方余,陈春超,等.基于共面补偿瞬变电磁法的接地网检测技术研究[J].工程地球物理学报,2025,22(06):758-766.
基金信息:
国网江苏省电力有限公司科技项目(编号：J2024131)