An EEMD-Based Electromagnetic Induction Method for Nondestructive Testing of Buried Metal Conductors

Song, Hengli; Dong, Haobin; Yuan, Zhiwen; Zhu, Jun; Zhang, Haiyang; Huang, Yulin

doi:10.1109/access.2019.2944549

Cited by 13 publications

(8 citation statements)

References 27 publications

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“…With the continuous research and development of fault diagnosis technology, the current grounding grid fault diagnosis technology is mainly based on the three principles of electromagnetic field, electrical network, and electrochemistry. With the emergence of new technologies, fault diagnosis technologies combining matrix theory, ultrasonic testing, electromagnetic imaging, artificial intelligence, neural networks and other high-tech technologies are also being gradually developed and applied [ 7 , 91 , 92 , 93 , 94 , 95 ], as we try to obtain as much information as possible about the corrosion status of the grounding grid in the case of uninterrupted power and no excavation.…”

Section: The Detection Technology and Protection Measures Of Soil Corrosionmentioning

confidence: 99%

Research Advances of Soil Corrosion of Grounding Grids

Zhang

Liao²,

Xue

et al. 2021

Micromachines

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A grounding grid plays the role of discharging current and balancing voltage to ensure the safety of the power system. However, soil corrosion can damage the grounding grid, which then can endanger the safe operation of power system. This paper reviewed recent research advances of soil corrosion of grounding grid. The cause, mechanism, types, and influencing factors of soil corrosion of grounding grids were summarized, and the corresponding detection technology and protective measures were also introduced. The paper pointed out that soil corrosion is a serious threat to the grounding grid system. Moreover, the impact mechanism of AC stray current, new corrosion detection technology, and better protective measures still need in-depth research.

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Section: The Detection Technology and Protection Measures Of Soil Corrosionmentioning

confidence: 99%

Research Advances of Soil Corrosion of Grounding Grids

Zhang

Liao²,

Xue

et al. 2021

Micromachines

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“…The paper introduces the system design of the step excitation scheme. Faraday's law of electromagnetic induction has a wide range of applications [14]- [16]. An EMF is an instrument developed based on this law to measure the flow of conductive liquid.…”

Section: Introductionmentioning

confidence: 99%

Study of the Ability of an Electromagnetic Flowmeter Based on Step Excitation to Overcome Slurry Noise

Yue

Chen

et al. 2020

IEEE Access

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An electromagnetic flowmeter (EMF) can be used to measure the speed of slurry fluid. In this paper, according to Maxwell's equations and the dB/dt vortex electric field, a step excitation scheme is proposed. The original excitation process of the primary excitation current rise time is divided into a twostep excitation process. Without increasing the excitation current rise time, the equivalent excitation frequency is increased by increasing the primary dB/dt. This method can enhance the EMF's ability to overcome slurry noise. The paper analyzes the design parameters of the step excitation scheme and designs the software and hardware. After that, the paper compares the step excitation scheme with the three-value rectangular wave excitation scheme based on wavelet transform signal processing. Experiments show that the step excitation EMF has a lower steady-state fluctuation rate when measuring mortar and has a stronger ability to overcome slurry noise. Additionally, the step excitation EMF and Yokogawa AXF 040G EMF are compared experimentally. Through flow calibration, clean water measurement, mortar measurement and dynamic response experiment, it is verified that the step excitation EMF has the ability to enhance the resistance to slurry noise at the same excitation frequency.

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“…However, the information from different periods were not exploited, and the influence of the temperature drifts was not corrected. By using multiple periods of TEM data in [24] and [25], the influence of BW and the noise caused by the motion measurement of the airborne TEM system were corrected with the wavelet transform and empirical mode decomposition (EMD) methods [26], [27], respectively. Although the EMD-based method was effective for the airborne TEM systems, the TEM response of different measurement periods were not separately processed, which made the denoising and BW correction performance for borehole TEM systems be strongly influenced by the magnetic hysteresis effect on the different sampling times.…”

Section: Introductionmentioning

confidence: 99%

EMD-Based Borehole TEM Array Signal Denoising and Baseline Wander Correction for NDT of Downhole Casings

et al. 2020

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Transient electromagnetic (TEM) techniques have been proven to be efficient for nondestructive testing (NDT) operations due to their pulsed eddy-current properties. However, in the field of downhole measurements, harsh environments may significantly influence the NDT performance in downhole casings. In this paper, an empirical mode decomposition (EMD) method based on borehole TEM array signal denoising and baseline wander (BW) correction is proposed to compensate for the bad measurement conditions that affect downhole NDT. Based on the borehole TEM signal model, we investigated the principle of the EMD approach for the borehole TEM response, where the background magnetic noise and temperature drift effects were analyzed by considering the motion measurement and effective permeability. It was found out that although the BW can be effectively removed with the EMD approach, the performance of the signal denoising is closely related to the measurement speed of the downhole NDT sensors. To solve this problem, we proposed an array-based ensemble EMD method to improve the denoising performance of the borehole TEM signals by formulating a three-dimensional borehole TEM data structure, where the generation of the noise-aided data can be more efficient by employing the borehole TEM array. The performance of the proposed method was verified by applying it to a borehole TEM system for the NDTs of oil-well casings. In addition, field experiments were conducted, and the results demonstrated the effectiveness of the proposed method.

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An EEMD-Based Electromagnetic Induction Method for Nondestructive Testing of Buried Metal Conductors

Cited by 13 publications

References 27 publications

Research Advances of Soil Corrosion of Grounding Grids

Research Advances of Soil Corrosion of Grounding Grids

Study of the Ability of an Electromagnetic Flowmeter Based on Step Excitation to Overcome Slurry Noise

EMD-Based Borehole TEM Array Signal Denoising and Baseline Wander Correction for NDT of Downhole Casings

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