Research on the influence of ac current overflowing on grounding electrode corrosion

Liu, Guohua; Wu, Zhen; Li, Wei; Zhang, Zhanlong; Mei, Daojun

doi:10.1088/1757-899x/231/1/012039

Cited by 4 publications

(2 citation statements)

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“…Studies have shown that the corrosion caused by stray currents, especially DC stray currents, is very serious, and the amount of corrosion is proportional to the current passing time and current intensity [ 22 , 60 , 63 , 83 ]. Xu et al [ 84 ] found that DC stray currents have a more serious impact on grounding grid materials than AC stray currents and other environmental factors.…”

Section: The Formation Mechanism and Influencing Factors 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 Formation Mechanism and Influencing Factors Of Soil Corrosionmentioning

confidence: 99%

Research Advances of Soil Corrosion of Grounding Grids

Zhang

Liao²,

Xue

et al. 2021

Micromachines

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“…Recently, numerous methods based on electromagnetic theory have been proposed. The port circuit method measures the equivalent impedance at grounding grid access points [6]. This method can detect global damage rather than local corrosion of the grid.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive diagnosis of grounding grids based on the electromagnetic induction impedance method

Song¹,

Dong²,

Wang³

et al. 2021

Meas. Sci. Technol.

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When attempting to detect faults in grounding grids, the electromagnetic induction method is hampered by the failure of fault diagnosis based on magnetic flux density detection. An electromagnetic induction impedance method is proposed to diagnose corrosion faults by detecting the induced impedance. A non-destructive testing prototype was developed. The sensor of the prototype consists of biaxial sensing coils, a frequency selection module, and a dual-channel synchronous demodulator. The biaxial sensing coils are configured as four identical coils forming a cross. This symmetrical structure realizes the detection of unknown topological structures in grounding grids. The frequency selection module improves the signal-to-noise ratio of the system. The digital demodulator synchronously extracts the phase information in two orthogonal directions. The key technical indicators of the prototype, such as the frequency characteristics, the amplitude accuracy, the phase accuracy, the interference resistance, and the amplitude consistency between channels are tested. Experiments were carried out on a real-size physical model, corroded samples, and an actual operating substation. The results confirm the feasibility of the method and the prototype for the detection of topological structures, disconnections, and faults in grounding grids.

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