KEYWORDS: Signal detection, Corrosion, Detection and tracking algorithms, Interference (communication), Error analysis, Data processing, Signal processing, Electromagnetism, Visualization, Resistance
The grounding network is an indispensable part of the substation. There are many ways to detect the corrosion of a grounding network. However, no matter what method is used for detection, data collection needs to be processed. In this paper, a convenient and fast data processing algorithm for ground grid corrosion is designed, which can quickly eliminate the interference of DC bias, sine, and other obvious random noise, and has good real-time performance.
Based on the simulation calculation of grounding grid corrosion, a non-excavation method of grounding grid corrosion detection scheme is designed. Firstly, a given excitation current signal is injected into the diagonal of the measurement area of the ground network. Then, the magnetic field intensity of the current conductor directly above the ground is detected, the current intensity is solved by the Bio-Savart law, and R=U/I is calculated with the voltage signal measured between the accessible nodes. Finally, the degree of resistance corrosion between each group of nodes is obtained.
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