The influence of seasonal soil moisture on the behavior of soil resistivity and power distribution grounding systems

Coelho, Vilson Luiz; Piantini, Alexandre; Almaguer, Hugo A. D.; Coelho, Rafael A.; Boaventura, Wallace do Couto; Paulino, José Osvaldo Saldanha

doi:10.1016/j.epsr.2014.07.027

Cited by 36 publications

(5 citation statements)

References 7 publications

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“…The identified strong correlation between soil moisture, soil resistivity, as well as monthly rainfall allows Coelho et al [9] to improve the design and performance of power distribution grounding systems. Another example can be found in IEC 61936-1 [10] for transmission system design, which requires that a resistivity scale factor of 5 to 6 times the "summer" value should be used to account for the increase in soil resistivity during the winter in very cold regions.…”

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confidence: 99%

Laboratory Investigations on Factors Affecting Soil Electrical Resistivity and the Measurement

Zhou

Wang

et al. 2015

IEEE Trans. on Ind. Applicat.

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Soil electrical resistivity is an important parameter in grounding system design. In this study, laboratory measurements of soil electrical resistivity are carried out using a soil box. Two measurement methods are used and compared: a two-electrode method and a four-electrode method. The measurements indicate that the results reported by the two-electrode method are affected by the contact resistance between the electrodes and the soil, which increases as the soil water content increases. Moreover, the soil electrical resistivity was observed to decrease as the test signal frequency increases. Using the four-electrode method and a 50-Hz AC signal, the effects of soil water content, soil porosity, pore fluid composition, and temperature on the soil electrical resistivity are then investigated. The results show that increasing the soil saturation level results in a power-function decrease in the soil electrical resistivity. Also, for a given gravimetric water content, as the soil porosity decreases, the resistivity decreases. In addition, owing to the mobility of the ions, different electrolytes in the pore fluid contribute differently to the soil electrical resistivity. Finally, the dependence of soil electrical resistivity on soil temperature is found to be divided into three stages: above 0 degrees Celsius, around 0 degrees Celsius, and below 0 degrees Celsius. An abrupt change in the soil electrical resistivity is observed at around 0 degrees Celsius.

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confidence: 99%

Laboratory Investigations on Factors Affecting Soil Electrical Resistivity and the Measurement

Zhou

Wang

et al. 2015

IEEE Trans. on Ind. Applicat.

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“…Other factors that can affect the remote earth are the soil resistivity and moisture contents of remote earth built surrounded the rod under test. It has also been seen in many studies that soil resistivity and moisture contents have a strong influence on the grounding systems [13,14,[16][17][18][19], and these effects cannot be ignored. It would be expected that if the distance of the remote earth from the rod is changed to a different location, the results would be expectedly different too.…”

Section: Earth Electrode Configurationsmentioning

confidence: 99%

Influence of remote earth and impulse polarity on earthing systems by field measurement

Abdullah

Nor

Agbor

et al. 2018

IET Science, Measurement & Technology

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“…The electrical resistivity of soil is a function of the soil constituents (particle size distribution, mineralogy), of the presence of voids (porosity, pore size distribution, connectivity), of the degree of water saturation (water content), of the electrical resistivity of the fluid (solute concentration) and of temperature [23], [24].…”

Section: Soil and Building Materials Electrical Propertiesmentioning

confidence: 99%

Dangerous touch voltages in buildings: The impact of extraneous conductive parts in risk mitigation

Colella

Pons

Tommasini

2017

Electric Power Systems Research

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International (IEC) European (CENELEC) and American (NEC) Standards require, in each building, the connection of extraneous conductive parts (i.e. metal water or gas pipes) to the main grounding terminal. There are two good reasons for this: the voltage between extraneous conductive parts and exposed conductive parts is zeroed and extraneous conductive parts can contribute to the leakage of fault current into the ground. There is however a third advantage in the bonding connection: the entire structure (floors and walls of the building), together with the exposed and the extraneous metallic parts, forms a quasi-equipotential system, with the consequent strong reduction of touch voltages. Metallic pipes and reinforcement of reinforced

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The influence of seasonal soil moisture on the behavior of soil resistivity and power distribution grounding systems

Cited by 36 publications

References 7 publications

Laboratory Investigations on Factors Affecting Soil Electrical Resistivity and the Measurement

Laboratory Investigations on Factors Affecting Soil Electrical Resistivity and the Measurement

Influence of remote earth and impulse polarity on earthing systems by field measurement

Dangerous touch voltages in buildings: The impact of extraneous conductive parts in risk mitigation

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