The Heat and Buried Cable Conundrum: A Method to Help Determine Underground Cable Ampacity

Malmedal, Keith; Bates, Carson; Cain, David

doi:10.1109/mias.2015.2459110

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…The standard IEC 60287 [31] indicates how the effective thermal resistivity and thermal resistance of the soil can be calculated. The ability of the soil to keep its thermal resistivity constant in the presence of a heat source is named thermal stability of the soil [32]. The soil moisture content has a significant effect on buried cables capacity and soil thermal resistivity.…”

Section: Non-homogeneous Soilmentioning

confidence: 99%

Thermal Assessment of Power Cables and Impacts on Cable Current Rating: An Overview

2020

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The conceptual assessment of the rating conditions of power cables was addressed over one century ago, with theories based on the physical and heat transfer properties of the power cable installed in a given medium. During the years, the evolution of the computational methods and technologies has made more powerful means for executing the calculations available. More detailed configurations have been analysed, also moving from the steady-state to dynamic rating assessment. The research is in progress, with recent advances obtained on both advanced models, extensive calculations from 2D and 3D finite element methods, simplified approaches aimed at reducing the computational burden, and dedicated solutions for specific types of cables and applications. This paper provides a general overview that links the fundamental concepts of heat transfer for the calculation of cable rating to the advanced solutions that have emerged in the last years.

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Section: Non-homogeneous Soilmentioning

confidence: 99%

Thermal Assessment of Power Cables and Impacts on Cable Current Rating: An Overview

2020

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“…Additional studies are published to investigate the effects of varying parameters such as soil moisture content, buried depth, cable arrangement and backfill material on the thermal impedance, time constant and performance of underground cables [17]. The field tests are used to decide the amount of soil drying around a cable for varying heat rates in order to determine the non‐drying heat rate of the soil [18]. Moreover, the changes in electrical resistivity and thermal conductivity for different soils are also experimentally examined with different grain size distributions over a wide range of temperatures, from 20 to 100°C in [19].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of high‐voltage cables with several types of insulation for different configurations in the presence of harmonics

Shazly

Mostafa²,

Ibrahim³

et al. 2017

IET Generation, Transmission & Distribution

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“…The differences in ampacity values determined using various commonly followed methods are presented in [58] and the authors emphasized the significance of in-situ measurements of soil thermal resistivity over the "typical" value approach. The authors of [102][103][104] presented underground cable ampacity models paying attention to the effects of soil moisture content and soil-drying on the ampacity rating. These works indicate that the soil moisture content and moisture migration have a significant effect on the actual current carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

Ampacity and thermal equivalent modeling of subsea power cables for long distance power transmission and optimization

Duraisamy¹

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One of the defining aspects of life in the modern world is the convenience of access to a dependable and plentiful supply of electricity. This essential utility is delivered to consumers from power generating stations via an extensive and intricate network of cables. Submarine power cables are becoming increasingly important to modern power transmission strategies. There has been a large amount of recent investment in projects such as offshore wind farms and international "megagrid" initiatives, of which submarine power cables are essential components.The installation and maintenance costs of such buried cables are far higher than the overhead lines due to the complexity involved. The cable construction and cooling system for the cables are not interchangeable with their overhead counterparts. The maximum allowable cable conductor temperature is limited to avoid cable failures. The maximum current carrying capacity (ampacity) of power cables depends on the heat transferability of its surrounding medium. Submarine power cable ampacity is calculated conventionally following the international standards defined for underground cables. This conservative approach results in the system over design and under-utilization of the cable capacity. In reality, the thermal behavior of submarine environments differs significantly from its underground counterpart as the porous sediments are constantly water-saturated.The research aims to model the electrical and thermal characteristics of such long distance cables for accurately determining the effect of the factors that influence the ampacity and optimize the power flow. The cable ampacity analyses were

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The Heat and Buried Cable Conundrum: A Method to Help Determine Underground Cable Ampacity

Cited by 8 publications

References 10 publications

Thermal Assessment of Power Cables and Impacts on Cable Current Rating: An Overview

Thermal Assessment of Power Cables and Impacts on Cable Current Rating: An Overview

Thermal analysis of high‐voltage cables with several types of insulation for different configurations in the presence of harmonics

Ampacity and thermal equivalent modeling of subsea power cables for long distance power transmission and optimization

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