Pulsed Eddy Current Electromagnetic Signal Noise Suppression Method for Substation Grounding Grid Detection

Su Xu, Yanjun Zhang, Ruiqiang Zhang, Xiaobao Hu, Bin Jia, Ming Ma and Jingang Wang ()
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Su Xu: Baotou Power Supply Branch of Inner Mongolia Electric Power (Group) Co., Ltd., Baotou 014030, China
Yanjun Zhang: Baotou Power Supply Branch of Inner Mongolia Electric Power (Group) Co., Ltd., Baotou 014030, China
Ruiqiang Zhang: Baotou Power Supply Branch of Inner Mongolia Electric Power (Group) Co., Ltd., Baotou 014030, China
Xiaobao Hu: Baotou Power Supply Branch of Inner Mongolia Electric Power (Group) Co., Ltd., Baotou 014030, China
Bin Jia: Baotou Power Supply Branch of Inner Mongolia Electric Power (Group) Co., Ltd., Baotou 014030, China
Ming Ma: Baotou Power Supply Branch of Inner Mongolia Electric Power (Group) Co., Ltd., Baotou 014030, China
Jingang Wang: State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China

Energies, 2025, vol. 18, issue 21, 1-20

Abstract: As the primary discharge channel for fault currents, substation grounding grids are crucial for ensuring the safe and stable operation of power systems. Due to its non-destructive and efficient nature, the pulsed eddy current (PEC) method has become a research hotspot in grounding grid detection in recent years. However, during the detection process, the signal is severely interfered with by substation noise, seriously affecting data quality and interpretation accuracy. To address the problem of suppressing both power frequency and random noise, this paper proposes a composite denoising method that combines bipolar cancellation, minimum noise fraction (MNF), and mask-guided self-supervised denoising. First, based on the periodic characteristics of power frequency noise, a bipolar pulse excitation and differential averaging process is designed to effectively filter out power frequency interference. Subsequently, an MNF algorithm is introduced to identify and reconstruct random noise, improving signal purity. Furthermore, a mask-guided self-supervised denoising model is constructed, using a segmentation convolutional neural network to extract signal-noise masks from noisy data, achieving refined suppression of residual noise. Comparative experiments with simulation and actual substation noise data show that the proposed method outperforms existing typical noise reduction algorithms in terms of signal-to-noise ratio improvement and waveform fidelity, significantly improving the availability and interpretation reliability of pulsed eddy current data.

Keywords: substation grounding grid; PEC; noise suppression; MNF; mask (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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