Behaviour of the thermal impedance of buried power cables

Papagiannopoulos, Ioannis; Chatziathanasiou, V.; Exizidis, Lazaros; Ανδρέου, Γεώργιος; Mey, G. De; Więcek, B.

doi:10.1016/j.ijepes.2012.07.064

Cited by 27 publications

(12 citation statements)

References 16 publications

(17 reference statements)

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“…Dynamic thermal behaviour of underground power cables is investigated by theoretical analysis concerning the thermal behaviour of the cable and experimental study. The concept of thermal impedance is used to determine the thermal properties of a power cable buried in earth with respect to the burial depth and soil type [16].…”

Section: Introductionmentioning

confidence: 99%

Improving underground power distribution capacity using artificial backfill materials

Gouda¹,

Dein

2015

IET Generation, Transmission & Distribution

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Section: Introductionmentioning

confidence: 99%

Improving underground power distribution capacity using artificial backfill materials

Gouda¹,

Dein

2015

IET Generation, Transmission & Distribution

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“…The cable temperature, for a given rate of heat production, is determined by the thermal conductivity of the soil, the temperature of the environment, and the geometry of the path between the cable and the environment. Many analytical (Neher and McGrath, 1957; Papagiannopoulos et al, 2013; Chatziathanasiou et al, 2013; de Lieto Vollaro et al, 2011b) and numerical (Ocłoń et al, 2015a, 2015b, 2016; Kovac et al, 2013; Canova et al, 2012; de Lieto Vollaro et al, 2011a; De Leon and Anders, 2008) studies have investigated the heat dissipation of buried electric cables. In these studies, however, it was not considered that heat dissipation strongly depends on the hydraulic dynamics and water content distribution in the soil (Taylor and Cavazza, 1954; de Vries, 1963; Cass et al, 1984).…”

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confidence: 99%

Estimation of Thermal Instabilities in Soils around Underground Electrical Power Cables

Kroener

Campbell²,

Bittelli

2017

Vadose Zone Journal

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Core Ideas We studied coupled water, vapor, and heat flow around underground cables. There is a water–vapor flow cycle in the soil around these cables. This water–vapor cycle breaks down at the critical heat dissipation rate. The critical heat dissipation rate depends on soil hydraulic properties. The decentralized production of electrical energy from wind requires the installation of more and more underground power cables. From an economic standpoint it is very important to estimate the cables' lifetime, which strongly depends on the temperature. A correct estimation of cable temperature requires an accurate description of the heat balance equation around the cable. Most of the models used to assess heat dissipation from cables, however, do not consider that the soil thermal conductivity strongly depends on soil water content and hydraulic dynamics in the vicinity of the cable. The high temperature around the cable induces a water–vapor cycle in the soil: liquid water evaporates near the cable, and this vapor condensates in the more distant and colder parts of the soil. Above a critical heat dissipation rate, the soil around the cable dries out and the water–vapor cycle breaks down. In this study, we analytically estimated the critical heat dissipation rate as a function of soil type, soil temperature, and water content. We validated the analytical estimation by comparison to a numerical solution of the coupled heat–water–vapor transport for various soil types and conditions. The numerical code was validated by simulating a soil drying experiment. The proposed estimation of thermal instabilities in soils could become a powerful tool in the design of underground electrical power cable systems.

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“…The computational domain used is 1600mm*1600mm, ambient temperature and soil temperature in summer are 288K and 298K respectively either soil temperature and ambient temperature in winter are 283K. Table (5) shows the comparison between the numerical results of the present model with the numerical results in [14] to calculate the temperature of the cable. The table illustrations there is an acceptable agreement between the calculated results of the presented model and the numerical results in [14].…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Thermal State for Underground Power Cables in Nasiriya City

Doodan¹,

Hannun²

2020

UTJES

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Due to the increase in demand for electric power and increasing population density in different regions, the application of underground cables has become widely used in transmission and distribution networks. In this paper, the thermal behavior of underground cables was studied numerically. Four types of underground cables were selected copper conductor cables with (95 mm2) and (240 mm2) and aluminum conductor cables (95mm2) and (240mm2), which are used in the power networks in Iraq. The study was carried out based on the conditions surrounding such as the ambient temperature, the thermal properties of the soil and the current capacity, its effect on the thermal behavior of the cables. The results of the numerical simulation showed that the surrounding factors and loading capacities have a direct effect on determining the temperature of the cable. In addition, the type and size of the conductor cable material have an effect on determining the current-carrying capacity of the cable where the conductor cable with a nominal cross-sectional area 240mm2 has a temperature higher than the conductor cable with nominal cross-sectional 95mm2by (8.96%) for the copper conductor and (13.68%) for the aluminum conductor at current 500A.

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Behaviour of the thermal impedance of buried power cables

Cited by 27 publications

References 16 publications

Improving underground power distribution capacity using artificial backfill materials

Improving underground power distribution capacity using artificial backfill materials

Estimation of Thermal Instabilities in Soils around Underground Electrical Power Cables

Evaluation of Thermal State for Underground Power Cables in Nasiriya City

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