Duan Qingming, Zou Bofeng, Song Yuxin, Liu Yuxiang, Zhang Ruipeng
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130012, China.
Sensors (Basel). 2023 Aug 18;23(16):7254. doi: 10.3390/s23167254.
The grounding network is a significant component of substations, and the corrosion of its ground resistance is predominantly detected using the electromagnetic method. However, the application of electromagnetic methods for detecting corrosion within earthing networks has received relatively limited attention in research. Currently, the prevailing method utilizes electromagnetic techniques to identify the breakage points within the given earthing network. In this study, we propose a corrosion detection method for grounding networks based on the low-frequency electromagnetic method, which measures the resistance value between individual nodes of the network. Specifically, an excitation source signal of a predetermined frequency was transmitted to the measurement segment of the grounding network, which facilitated the direct measurement of the strength of the induced magnetic field above the center of the measuring conductor. The recorded electromagnetic data were subsequently uploaded to the host computer for data processing, and the computer interface was constructed based on a LABVIEW design. By leveraging the relationship between the induced electric potential, current strength, excitation source strength, and additional voltage detection devices, the resistance of the conductor under examination could be determined. Furthermore, the proposed method was tested under suitable conditions, and it demonstrated favorable results. Thus, the proposed method can serve as a foundation for developing electromagnetic testing instruments tailored to the investigated grounding network.
接地网是变电站的重要组成部分，其接地电阻的腐蚀主要采用电磁法进行检测。然而，电磁法在接地网腐蚀检测中的应用在研究中受到的关注相对有限。目前，普遍采用的方法是利用电磁技术识别给定接地网中的断点。在本研究中，我们提出了一种基于低频电磁法的接地网腐蚀检测方法，该方法测量网络中各个节点之间的电阻值。具体而言，将预定频率的激励源信号传输到接地网的测量段，便于直接测量测量导体中心上方感应磁场的强度。随后将记录的电磁数据上传到主机进行数据处理，并基于LABVIEW设计构建计算机接口。通过利用感应电势、电流强度、激励源强度和附加电压检测装置之间的关系，可以确定被测导体的电阻。此外，该方法在合适的条件下进行了测试，并取得了良好的结果。因此，该方法可为开发针对所研究接地网的电磁测试仪器奠定基础。
