Improved Methodology for High-Frequency Low-Current Measurement of Grounding Rod Impedance

Llovera, P.; LLiso, J.A.; Fuster, Vicente Domingo Estruch; Quijano, Alfredo

doi:10.1109/tpwrs.2008.923812

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…Expressions for R , L and C of the vertical ground rod as one of the simplest and most commonly used means for current dissipation have similar ‘nature’, and consequently, give approximately the same results. As from [16], the following expressions are obtained.

R = \frac{ρ}{2 π l} (\ln \frac{8 l}{d} - 1)

C = \frac{ε l}{18 \ln false(4 l / d false)} \times 10^{- 9}

L = 2 l \ln ()(, \frac{4 l}{d}) \times 10^{- 7}

Recent studies show that it is also important to consider both soil parameters, conductivity and permittivity, as frequency‐dependent, because soil behaves as brine or semiconductor.…”

Section: Frequency Response Of the Grounding Elements’ Characteristicsmentioning

confidence: 99%

“…There are a number of mathematical models with regards to the grounding devices’ elements. All these theories use different approaches: Maxwell equations solutions (electromagnetic theory) [14, 19], transmission line model [15], antenna (full‐wave) model [20] and circuit theory [16–18, 21]. There are also some works with the experimental data [15, 22].…”

Section: Modelling Of Current and Potential Distribution For Groundinmentioning

confidence: 99%

“…He described a fundamental behaviour of grounding in the soil. A number of other authors have dealt with the same area as well [14][15][16]. All of them have common analysis approach to estimate the impedance of the grounding devices elements.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling and analysis of current and potential distribution paths for grounding devices

Chikarov

Lie

Nair

2013

IET Generation, Transmission & Distribution

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This study proposes and develops a mathematical formulation that helps to clearly understand the current and voltage distribution in the damaged and physically integrated horizontal elements of grounding systems. This realistic mathematical model of the grounding device with damaged elements will help to estimate the current and voltage distribution at the generating substation and will improve safety conditions for staff and equipment and reducing damages associated with equipment failures. It will also provide the basis for developing novel grounding integrity detection techniques.

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R = \frac{ρ}{2 π l} (\ln \frac{8 l}{d} - 1)

C = \frac{ε l}{18 \ln false(4 l / d false)} \times 10^{- 9}

L = 2 l \ln ()(, \frac{4 l}{d}) \times 10^{- 7}

Recent studies show that it is also important to consider both soil parameters, conductivity and permittivity, as frequency‐dependent, because soil behaves as brine or semiconductor.…”

Section: Frequency Response Of the Grounding Elements’ Characteristicsmentioning

confidence: 99%

Section: Modelling Of Current and Potential Distribution For Groundinmentioning

confidence: 99%

See 1 more Smart Citation

Modelling and analysis of current and potential distribution paths for grounding devices

Chikarov

Lie

Nair

2013

IET Generation, Transmission & Distribution

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“…The high-current method recommended by the IEEE can only be carried out when the power system is under outage and the outcome only reflects the connectivity of the grounding leads and the main grid [1]. Currently, monitoring and evaluating the grounding grid conditions rely on electrical parameters obtained from measurements, including the ground resistance, the touch voltage, and the step voltage [5,6,7,8,9,10,11]. Most of the parameter measurement methods are offline.…”

Section: Introductionmentioning

confidence: 99%

A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids

Wang

et al. 2019

Sensors

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The grounding grid is critical to the safety and stability of a power system. Corrosive cracking of the grounding conductor is the main cause of deterioration of grounding grid performance. Existing fault diagnosis methods for grounding grids are limited by the number and distribution of grounding leads, and some of them cannot be used for online detection. This paper proposes a grounding grid detection method based on magnetic source excitation. The measuring device consists of four coils, two horizontal excitation coils, and two vertical receiving coils. The secondary magnetic field signal is extracted from the primary field and the background field by properly positioning the coils, such that the measured signal can reflect the underground media more accurately. The measuring device of the method is portable, the measurement process is contactless with the grounding grid, and it is not limited by the grounding leads. Furthermore, it has a strong anti-interference ability and can realize online detection. It was proven by simulations and experiments that the proposed method has a higher measurement accuracy and stronger anti-interference ability when compared with existing methods. This paper also discusses the influence of various factors such as the number and the location of the breakpoints, the frequency of the excitation source, the soil resistivity, and stratification from the measurement data. It was proven that the method has high precision and a wide application range, and is important for guiding significance and reference value in engineering applications.

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“…An improved methodology for high-frequency lowcurrent measurement of grounding rod impedance was investigated. Hence, the high-frequency behavior of grounding rods is a major concern in several applications where highfrequency currents are involved, such as lightning currents or transient phenomena [4].…”

Section: Introductionmentioning

confidence: 99%

Design of a universal circuit for generation of impedance standards

El-Raouf¹

2014

29th Conference on Precision Electromagnetic Measurements (CPEM 2014)

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Impedance standards are very important tools in the field of electrical metrology. Therefore, capacitance, inductance, and resistance standards exist in all of the electrical laboratories, but with different accuracy levels. Design of a universal circuit, which can generate all of these quantities, is demonstrated in this paper. It is mainly based on microcontroller technique and electronic relays. This circuit also can be automatically controlled by specially designed program using the LabVIEW, which enables the automatic calibrations.

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Improved Methodology for High-Frequency Low-Current Measurement of Grounding Rod Impedance

Cited by 7 publications

References 16 publications

Modelling and analysis of current and potential distribution paths for grounding devices

Modelling and analysis of current and potential distribution paths for grounding devices

A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids

Design of a universal circuit for generation of impedance standards

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