Grounding system analysis in transients programs applying electromagnetic field approach

Heimbach, M.; Grcev, L.

doi:10.1109/61.568240

Cited by 71 publications

(12 citation statements)

References 15 publications

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“…To some degree, the method cannot evaluate the performance of every single branch clearly. There are other kinds of solution for fault diagnosis in grounding grids, such as electrochemical method [7], the transient electromagnetic method [8,9], a frequency-domain analysis [10], the electromagnetic method [11][12][13], and the electric network method [14][15][16][17] for nondestructive testing.…”

Section: Introductionmentioning

confidence: 99%

A Cycle Voltage Measurement Method and Application in Grounding Grids Fault Location

et al. 2017

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Abstract:The corrosion of grounding grids can result in a grounding accident of a power system, and much attentions has been concentrated on the method used to detect a corrosion fault in a grounding grid, in which the methods of voltage measurement and magnetic field measurement are usually used. In this paper, a cycle voltage measurement method and L-curve regularization method are proposed to locate the faults in grounding grids. The L-curve method was used to select the appropriate regularization parameter, which can effectively balance the error and stability of the solution to the inverse problem. The uncertainty of the solution due to the ill-posed problem in the inverse problem has been well-solved. Experiments were conducted in a laboratory with two network types. In addition, a field experiment was carried out in a 110-kV substation. Both of the results showed that the method can effectively locate a branch fault with a single branch and multiple branches in the grounding grids.

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Section: Introductionmentioning

confidence: 99%

A Cycle Voltage Measurement Method and Application in Grounding Grids Fault Location

et al. 2017

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“…Much more accurate results can be obtained using methods based on electromagnetic field calculations but such methods are difficult to integrate into EMTPs. Recently, a number of studies have appeared presenting methods for integration of electromagnetic field calculation models of complex grounding systems into popular EMTPs [5][6][7]. These works characterize the grounding systems in terms of n-terminal impedance or admittance matrices in the frequency domain, which are fitted with rational functions for inclusion in EMTPs.…”

Section: Introductionmentioning

confidence: 99%

“…It follows that the field solver must be reapplied every time a new configuration is to be studied. This paper presents a different approach compared to [5][6][7] as the field solver is no longer needed by the end user of the model. The main idea is to store the results obtained by the field solver in a multi-dimensional lookup array for later use.…”

Section: Introductionmentioning

confidence: 99%

Inclusion of Field-Solver-Based Tower Footing Grounding Models in Electromagnetic Transient Programs

Holdyk

Gustavsen

2015

IEEE Trans. on Ind. Applicat.

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This paper presents a new approach to wide-band modeling of tower footing grounding impedances. Appropriate representation of transmission tower footing impedances is essential in electromagnetic transient simulations for proper evaluation of overvoltages and flashovers in the system during fast-front transient conditions such as lightning strikes. In this paper, a field solver is used to precisely model the most popular types of tower footing grounding systems, i.e. rods, counterpoises and ring electrodes, for a variety of dimensions and soil parameters. Results are stored in a lookup table and used for generating frequency-dependent models that are exported to electromagnetic (EM) transient simulators. The table and model generation tool can be used by utility companies to model tower footings while taking into account local variations along the right-of-way, such as local variations in soil resistivity. The presented examples show close agreement of results of lightning studies using developed electrode models included in EM tools: PSCAD, EMTP-RV and ATP-EMTP.A sensitivity study shows that the maximum voltage at the tower top during a direct lightning strike can be up to 19% higher when using the adopted modeling procedure, compared to a standard approach of using a fixed resistor equal to the power frequency resistance.

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“…On the contrary, a numerical electromagnetic analysis (NEA) method can simulate transients only by the geometrical and physical parameters of a given system, and thus the NEA method is effective in analyzing the transient responses of a grounding electrode buried in earth whose resistivity and permittivity are not clear [17][18][19][20][21]. On the contrary, a numerical electromagnetic analysis (NEA) method can simulate transients only by the geometrical and physical parameters of a given system, and thus the NEA method is effective in analyzing the transient responses of a grounding electrode buried in earth whose resistivity and permittivity are not clear [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A Method for Reducing Grounding Impedance

Ametani

Fujita

Morii

et al. 2013

Electrical Engineering Japan

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This paper investigates grounding impedance reduction with various shapes of grounding electrodes in comparison with a conventional vertical rod based on field measurements and FDTD simulations. It is found that a vertical rectangular conducting plate is effective for reducing the transient and steady-state impedance to less than half that of the vertical rod. A circular conducting plate parallel to the earth surface is also effective in reducing the steady-state impedance, but the transient impedance is nearly the same as that of the vertical rod. The rate of reduction is proportional in some way to the surface area of the electrode, but tends to saturate as the area increases. The transient impedance is rather independent of the earth resistivity and permittivity, but tends to be inversely proportional to the wavefront duration of the applied current.

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Grounding system analysis in transients programs applying electromagnetic field approach

Cited by 71 publications

References 15 publications

A Cycle Voltage Measurement Method and Application in Grounding Grids Fault Location

A Cycle Voltage Measurement Method and Application in Grounding Grids Fault Location

Inclusion of Field-Solver-Based Tower Footing Grounding Models in Electromagnetic Transient Programs

A Method for Reducing Grounding Impedance

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