A fast method to compute the grounding resistance of a coated electrode using the coated electrode equivalent radius

Faleiro, E.; Asensio, Gabriel; Denche, Gregorio; Moreno, José Luis Ocaña

doi:10.1016/j.ijepes.2021.107879

Cited by 6 publications

(1 citation statement)

References 18 publications

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“…The finite element method can accurately calculate the electric field around the foundation [13,14]. However, due to the complex structure of the reinforced concrete foundation, establishment of the simulation model for one pile is troublesome and the computation is extensive, not to mention that usually the foundation consists of several piles.…”

Section: Introductionmentioning

confidence: 99%

A Method for Calculating Grounding Resistance of Reinforced Concrete Foundation Grounding Systems

Dou

et al. 2022

Energies

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Tower foundations have been used as grounding electrodes to reduce the area of the grounding devices. However, it is difficult to calculate the grounding resistance due to the complex structure of the reinforced concrete foundation. A method for calculating grounding resistance of reinforced concrete foundations is proposed in this paper. The method equates the complex foundation structure into a cylindrical conductor and then calculates the grounding resistance with the help of the method of moments, which simplifies establishment of the simulation model and reduces the extensive computation. In addition, the applicability of the equal cross-sectional area method and the equal cross-sectional perimeter method is analyzed. It shows that both methods are applicable only when the concrete resistivity is close to the soil resistivity. The equal cross-sectional area method is applicable when the concrete resistivity is within twice the soil resistivity, while the equal cross-sectional perimeter method is applicable when the concrete resistivity is approximately same or less than the resistivity of the soil.

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Section: Introductionmentioning

confidence: 99%

A Method for Calculating Grounding Resistance of Reinforced Concrete Foundation Grounding Systems

Dou

et al. 2022

Energies

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A Review of the Applications of Through-the-Earth (TTE) Communication Systems for Underground Mines

Ngwenyama,

Webber-Youngman

2024

Mining, Metallurgy & Exploration

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Underground mining accidents have the potential of leaving miners trapped in unknown and life-threatening locations for an extended period of time. The lives of the trapped and unaccounted-for miners are at risk and require emergency rescue. But, the primary tracking systems are highly susceptible to damage during accidents and are most likely to be defunct and inoperable post-accident. This prompted the need for a robust and reliable post-accident communication and locator system. Subsequently, the through-the-earth (TTE) communication systems were developed and tested in underground mines. Under ideal conditions, these systems are capable of post-accident full-duplex two-way voice, text, and data communication and fingerprint detection of the geolocations of the trapped miners. This is achieved through a wireless link established by the transmission of electromagnetic and seismic waves between surface and underground, even in challenged underground environments. Unlike the primary tracking systems, the TTE communication systems do not require extensive shaft-to-workplace backbone infrastructure. This has made the TTE systems to be less susceptible to damage and therefore suitable for post-accident communication. Instead, the Earth’s crust acts as the signal transmission medium which forms an uplink and downlink communication path. This is achieved by injecting an electric current into the ground using electrodes, by transmitting magnetic fields from a radiating loop antenna, or by inducing fingerprint geolocations using seismic waves. Range and data rates are the critical requirements for the effectiveness of these systems and are dependent on factors such as the antenna design, frequency, and rock properties. This study provides a review of the applications of the different types of TTE communication systems, their evolution, factors that affect them, and techniques for improving their efficiencies and capabilities. These systems present the mining industry with an opportunity to improve safety by providing post-accident communication and locating trapped miners as quickly as possible. This will improve their survival chances and ultimately reduce fatality rates in the mining industry.

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A corrosion degree detection method of grounding electrodes considering lightning grounding performance and thermal stability

Dan,

Zhang,

Wang

et al. 2024

Measurement

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A fast method to compute the grounding resistance of a coated electrode using the coated electrode equivalent radius

Cited by 6 publications

References 18 publications

A Method for Calculating Grounding Resistance of Reinforced Concrete Foundation Grounding Systems

A Method for Calculating Grounding Resistance of Reinforced Concrete Foundation Grounding Systems

A Review of the Applications of Through-the-Earth (TTE) Communication Systems for Underground Mines

A corrosion degree detection method of grounding electrodes considering lightning grounding performance and thermal stability

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