Electrical Properties of Soils

Friedman, Shmulik P.

doi:10.1007/978-90-481-3585-1_48

Cited by 5 publications

(2 citation statements)

References 83 publications

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“…In contrast, in a strong electric field, carrier motion is connected to processes occurring at the interface between the electrode and the dielectric. Conductivity γ is defined as the ratio of the current density of a material j to the electric field strength E, as below [15]:…”

Section: Resultsmentioning

confidence: 99%

Investigation on charge-carrier transport characteristics of transformer oil-based nanofluids

Yang

Dong

Zhang

et al. 2018

IEEE Trans. Dielect. Electr. Insul.

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Adding nanoparticles to traditional transformer oil can improve their heat exchange properties as well as enhance their dielectric withstand characteristics. Investigations into the charge-carrier transport characteristics of these transformer oil-based nanofluids (TNFs) can explain their improved insulating characteristics, and clarify the mechanisms dictating these modifications. In this study, we measured the conduction current and velocity field of TNFs under high electric field excitation for the first time, for analysis of charge-carrier transport. We describe different transport processes according to the magnitude of the applied electric field, characterized as ohmic, tunneling, and space charge limited current (SCLC) stages. In the ohmic stage, characterized by very low electric field strengths, the increase in conduction current is due to the increase in the number of carriers from the addition of nanoparticles. In the tunneling stage (medium-to-high electric field strengths), the predominant charge carriers in the TNF change from ions and colloidal particles, to electrons emitted from the electrode. The thickness of the Schottky barrier at the metal-liquid interface increases on the addition of nanoparticles, which reduces the number of electrons that pass through to the interface region. The field strength required for electron transmission is enhanced, and the insulation strength is improved. In the SCLC stage (very high electric fields), the carrier mobility is reduced because of the larger trap density of TNFs and the electrical discharge is suppressed.

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Section: Resultsmentioning

confidence: 99%

Investigation on charge-carrier transport characteristics of transformer oil-based nanofluids

Yang

Dong

Zhang

et al. 2018

IEEE Trans. Dielect. Electr. Insul.

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“…Archie's empirical equation provides the relationship between the degree of saturation (water content) and the electrical conductivity of the porous medium. Equation ( 25) is Archie's for variably unsaturated medium expressed in terms of the surface conductivity, σ s , of fine-grained soils, and the electric conductivity of the liquid, σ w , in the porous medium [37].…”

Section: Electrical Conductivity and Water Contentmentioning

confidence: 99%

New Method for Modelling Seasonal Variation in Resistance and Performance of Earthing Systems

Nnamdi,

Chandima

2023

Energies

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The current techniques utilized for estimating seasonal fluctuations in earthing system resistance, including artificial neural networks (ANNs) and correlation/correction factors, rely on resistance records, soil resistivity measurements, and meteorological data collected across broad areas. However, they frequently fail to consider the impact of soil conditions and properties at the actual earthing location. As a solution, this research introduces a new method that models atmospheric conditions as soil suction and incorporates hydraulic soil properties (soil water retention characteristics and hydraulic conductivity) to estimate the seasonal changes in earthing resistance and performance. To illustrate this approach, this study constructs geometric models of vertical earthing rods for three homogeneous soil textures (clayey, silty, and sandy) utilizing COMSOL Multiphysics software. By coupling the differential equations governing electric current and water flow using Archie’s formula and solving numerically with the finite element method (FEM) for various soil suctions, this research reveals that soil water retention and resistivity variations are notably influenced by soil texture. Sandy soil displays higher variability, silt soil demonstrates moderate changes, while clayey soil exhibits lower fluctuation. By linking soil resistivity changes to soil suction and hydraulic properties, this innovative method predicts seasonal trends in earthing resistance and performance.

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Delineation and description of soil horizons using ground-penetrating radar for soils under boreal forest in Central Karelia (Russia)

Ryazantsev

Hartemink

Бахмет

2022

CATENA

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Electrical Properties of Soils

Cited by 5 publications

References 83 publications

Investigation on charge-carrier transport characteristics of transformer oil-based nanofluids

Investigation on charge-carrier transport characteristics of transformer oil-based nanofluids

New Method for Modelling Seasonal Variation in Resistance and Performance of Earthing Systems

Delineation and description of soil horizons using ground-penetrating radar for soils under boreal forest in Central Karelia (Russia)

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