Cyclic Loading of Underground Cables Including the Variations of Backfill Soil Thermal Resistivity and Specific Heat With Temperature Variation

Gouda, Osama E.; Osman, Gomaa F. A.; Salem, Waleed A.A.; Arafa, Shawky H.

doi:10.1109/tpwrd.2018.2849017

Cited by 33 publications

(24 citation statements)

References 19 publications

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“…Particularly, along with the expansion of national and cross-border power grids with high voltage power cables [15,16], this soil parameter is a subject of remarkable interest as the installation depth of high voltage power lines is equivalent to very shallow; i.e., in horizontal geothermal applications. In this case, the thermal properties of the backfilling material also has to be of concern [17,18].…”

Section: Introductionmentioning

confidence: 99%

Comparison between Measured and Calculated Thermal Conductivities within Different Grain Size Classes and Their Related Depth Ranges

et al. 2018

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In the field of the efficiency of very shallow geothermal energy systems, there is still a significant need for research activity. To ensure the proper exploitation of this energy resource, the decisive geophysical parameters of soil must be well-known. Within this study, thermal conductivity, as a fundamental property for evaluating the geothermal potential of very shallow geothermal systems, was analyzed and measured with a TK04 device. A dataset, consisting of various geophysical parameters (thermal conductivity, bulk density, water content, and porosity) determined for a large range of different textural soil classes, was collated. In a new approach, the geophysical properties were visualized covering the complete grain size range. The comparison between the measured and calculated thermal conductivity values enabled an investigation with respect to the validity of the different Kersten equations. In the course of this comparison, the influence of effective bulk density was taken into account. In conclusion, both Kersten formulas should be used as recommended and regular bulk density corresponded better to the reference dataset representing the outcomes of the TK04 laboratory measurement. Another objective was to visualize the relation of thermal conductivities within their corresponding textural classes and the validity of Kersten formulas for various bulk densities, depths, and soils. As a result, the accessibility to information for expedient recommendations about the feasibility of very shallow geothermal systems will be improved. Easy, accessible know-how of the fundamentals is important for a growing renewable energy sector where very shallow geothermal installations can also cover heating and cooling demands.

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Section: Introductionmentioning

confidence: 99%

Comparison between Measured and Calculated Thermal Conductivities within Different Grain Size Classes and Their Related Depth Ranges

et al. 2018

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“…The unsuccessful choice of all these factors, according to standards, reduces the underground cable capacity up to 40% of its rated capacity [3]. Many of the authors discussed the effect of these factors on the current carrying capacity of cables and their accessories under steady state and cyclic loading conditions [10, 11]. As it is known, the cable terminations provide the transition from buried insulated cables to the network components such as transformers, distribution boxes and overhead lines.…”

Section: Introductionmentioning

confidence: 99%

Investigations of cable termination thermal analysis under continuous current loading

Gouda

Dein

2020

IET Generation, Transmission & Distribution

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“…The thermal stability around the cable is necessary to keep the cable conductor and insulation temperatures within the allowable limits [1][2][3][4]. Because of the soil temperature increase, the surrounding back-fill soils around underground power cables lose their moisture content, forming dry areas [5][6][7][8][9][10]. This leads to an increase in the soil thermal resistance and decreases the maximum current carrying capacity of the underground power cables.…”

Section: Introductionmentioning

confidence: 99%

“…Soil thermal resistivity is affected mainly by soil composition, degree of compaction, dry density, gradation, water content and temperature rise [1][2][3][4][5][6][7][8][9][10]. The problem of coupled heat and water flows around buried cables was investigated by several authors [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

On‐line monitoring device for dry zone formation in the soil surrounding underground power cables

Gouda

Osman

2020

IET Generation, Transmission & Distribution

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Cyclic Loading of Underground Cables Including the Variations of Backfill Soil Thermal Resistivity and Specific Heat With Temperature Variation

Cited by 33 publications

References 19 publications

Comparison between Measured and Calculated Thermal Conductivities within Different Grain Size Classes and Their Related Depth Ranges

Comparison between Measured and Calculated Thermal Conductivities within Different Grain Size Classes and Their Related Depth Ranges

Investigations of cable termination thermal analysis under continuous current loading

On‐line monitoring device for dry zone formation in the soil surrounding underground power cables

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