A Novel Method for Fault Diagnosis of Grounding Grids

Yu, Cigong; Fu, Zhihong; Wang, Qian; Tai, Heng–Ming; Qin, Shanqiang

doi:10.1109/tia.2015.2445745

Cited by 42 publications

(36 citation statements)

References 12 publications

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“…On the other hand, the down-lead lines are not in the branch intersection nodes will have a great effect on the accuracy of the electrical network method. The method based on electromagnetic field through measuring and analyzing the surface magnetic field [10] or the transient magnetic field of grounding grid to judge the corrosion state of the grounding grid [11,12]. In addition, Liu et al [13] utilized the magnetic field above the grounding grid to reconstruct the resistivity distribution image to find the break-point of the branch.…”

Section: Introductionmentioning

confidence: 99%

Imaging the Corrosion in Grounding Grid Branch with Inner-Source Electrical Impedance Tomography

Yang

Ming

et al. 2018

Energies

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The corrosion diagnosis of grounding grid can locate the corroded branches and provide guidance for the maintenance and repair of the grounding grid. This paper proposed the electrical impedance tomography (EIT) method on the corrosion diagnosis of grounding grid and described how it works. Firstly, the inverse problem model of the electrical impedance tomography on grounding grid is developed. Secondly, in order to weaken the ill-posedness of the inverse problem, a Newton iterative algorithm with Tikhonov regularization is proposed to solve the problem. Then, due to the high resistivity contrast between the soli and steel and the large size of imaging region, this paper presents the method of soil-separation and block-diagnosis to accomplish these problems. Finally, field experiments were carried out to verify the effectiveness of the proposed method and the results show that the location and degree of the corrosion in the grounding grid can be easily judged from the imaging results.

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Section: Introductionmentioning

confidence: 99%

Imaging the Corrosion in Grounding Grid Branch with Inner-Source Electrical Impedance Tomography

Yang

Ming

et al. 2018

Energies

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“…Electromagnetic field methods [5][6][7], electric circuit analysis [4,8,9], electrochemical methods [10,11] and optimization techniques [12,13] have been extensively used for corrosion and breakpoint diagnosis. However, in the case of unknown grounding grids topology and orientation are those two distinctive parameters that must be evaluated before applying any fault diagnosis technique.…”

Section: Introductionmentioning

confidence: 99%

Derivative Method Based Orientation Detection of Substation Grounding Grid

et al. 2018

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The grounding grid is a key part of substation protection, which provides safety to personnel and equipment under normal as well as fault conditions. Currently, the topology of a grounding grid is determined by assuming that its orientation is parallel to the plane of earth. However, in practical scenarios, the assumed orientation may not coincide with the actual orientation of the grounding grid. Hence, currently employed methods for topology detection fails to produce the desired results. Therefore, accurate detection of grounding grid orientation is mandatory for measuring its topology accurately. In this paper, we propose a derivative method for orientation detection of grounding grid in high voltage substations. The proposed method is applicable to both equally and unequally spaced grounding grids. Furthermore, our method can also determine the orientation of grounding grid in the challenging case when a diagonal branch is present in the mesh. The proposed method is based on the fact that the distribution of magnetic flux density is perpendicular to the surface of the earth when a current is injected into the grid through a vertical conductor. Taking the third order derivative of the magnetic flux density, the main peak coinciding with the position of underground conductor is accurately obtained. Thus, the main peak describes the orientation of buried conductor of grounding grid. Simulations are performed using Comsol Multiphysics 5.0 to demonstrate the accuracy of the proposed method. Our results demonstrate that the proposed method calculate the orientation of grounding grid with high accuracy. We also investigate the effect of varying critical parameters of our method.

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“…Recently, fault diagnosis of grounding grid has attracted the attention of many researchers. The methods of grounding grid fault diagnosis developed till date include electrochemical detection method [2], electromagnetic induction method [3][4][5], transient electromagnetic imaging method [6,7] and method based on theory of electric circuit [8][9][10]. Electrochemical detection method determines the degree and rate of corrosion by measuring electrochemical properties between grid conductors and soil.…”

Section: Introductionmentioning

confidence: 99%

“…This method is not valid for grounding grid corroded but not broken. Transient electromagnetic imaging (TEM) method calculates resistivity from magnetic field produced by induced eddy currents [6,7]. This method is applicable for breakpoint diagnosis but lacks to differentiate between broken conductor and absent conductor.…”

Section: Introductionmentioning

confidence: 99%

Breakpoint Diagnosis of Substation Grounding Grid Using Derivative Method

Qamar¹,

Shah²,

Kaleem³

et al. 2017

PIER M

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Abstract-Grounding grid is responsible for driving lightning and short circuit currents into ground. Faults in substation grounding grid can lead to significant rise in surface potential and ultimately loss to power system and operators. This paper proposes a novel technique based on derivative method to diagnose breakpoints in grounding grid. Derivative of surface magnetic flux density on circle results in peak at conductor's location. Once a conductor is broken the flow of current and surface magnetic field ceases, which is recognized by the absence of peak at corresponding conductor's location. The use of circle even enables this method for diagnosing diagonal branch. Furthermore, the method is analyzed for soil of different resistivities and monolayer and multilayer soils. Simulation results show that the proposed method is feasible for breakpoint diagnosis of grounding grid without excavation.

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A Novel Method for Fault Diagnosis of Grounding Grids

Cited by 42 publications

References 12 publications

Imaging the Corrosion in Grounding Grid Branch with Inner-Source Electrical Impedance Tomography

Imaging the Corrosion in Grounding Grid Branch with Inner-Source Electrical Impedance Tomography

Derivative Method Based Orientation Detection of Substation Grounding Grid

Breakpoint Diagnosis of Substation Grounding Grid Using Derivative Method

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