Configuration Detection of Substation Grounding Grid Using Transient Electromagnetic Method

Yu, Cigong; Fu, Zhihong; Wu, Gaolin; Zhou, Liuyuan; Zhu, Xun; Bao, Ming

doi:10.1109/tie.2017.2682033

Cited by 40 publications

(35 citation statements)

References 17 publications

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“…The drawback associated with the derivative method is the occurrence of false peaks due to the surrounding electromagnetic environment. The transient electromagnetic method (TEM) was used by [23] to determine the grounding grid configuration. Measuring points with high equivalent resistivity and low magnetic intensity showed the presence of the grounding conductor.…”

Section: Related Workmentioning

confidence: 99%

Detecting Grounding Grid Orientation: Transient Electromagnetic Approach

et al. 2019

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The configuration is essential to diagnose the status of the grounding grid, but the orientation of the unknown grounding grid is ultimately required to diagnose its configuration explicitly. This paper presents a transient electromagnetic method (TEM) to determine grounding grid orientation without excavation. Unlike the existing pathological solutions, TEM does not enhance the surrounding electromagnetic environment. A secondary magnetic field as a consequence of induced eddy currents is subjected to inversion calculation. The orientation of the grounding grid is diagnosed from the equivalent resistivity distribution against the circle perimeter. High equivalent resistivity at a point on the circle implies the grounding grid conductor and vice versa. Furthermore, various mesh configurations including the presence of a diagonal branch and unequal mesh spacing are taken into account. Simulations are performed using COMSOL Multiphysics and MATLAB to verify the usefulness of the proposed method.

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Section: Related Workmentioning

confidence: 99%

Detecting Grounding Grid Orientation: Transient Electromagnetic Approach

et al. 2019

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“…Grounding grid is an important part of electrical power system at substation for the discharge of dangerous current and safety of persons working at substation [1]. Grounding grid is vulnerable to corrosion due to working in moist underground environment for long time, which will weaken its ability of current-dispersing and voltage-sharing.…”

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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“…Moreover, this method requires orientation of grounding grid before it can be applied for topology detection. Reference [15] measures the grounding grid configuration by employing transient electromagnetic method (TEM). Secondary magnetic fields due to induced eddy currents in the grounding grid are recorded.…”

Section: Introductionmentioning

confidence: 99%

“…Grounding conductors lie under points of minimum magnetic field intensity. The flaw in [15] is that the orientation of grounding grid is presumed to be parallel to the plane of the earth which in real scenarios is unknown. In [16], line derivative is used to configure the topology of grounding grid.…”

Section: Introductionmentioning

confidence: 99%

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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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Configuration Detection of Substation Grounding Grid Using Transient Electromagnetic Method

Cited by 40 publications

References 17 publications

Detecting Grounding Grid Orientation: Transient Electromagnetic Approach

Detecting Grounding Grid Orientation: Transient Electromagnetic Approach

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

Derivative Method Based Orientation Detection of Substation Grounding Grid

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