Equivalent circuit for the thermal analysis of cables in non‐vented vertical risers

Baker, Imad; León, Francisco de

doi:10.1049/iet-smt.2014.0127

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…The results given in Tables 3 and 4 are in agreement with that reported by ref. [21]. As given in Table 3 it is noticed also that for the same cable rating the cable current capacity installed in riser is much lower when it is installed in duct and buried in soil.…”

Section: Results and Discussion Of Steady State Cable Loadingmentioning

confidence: 81%

“…For complex cable arrangements, such as cables on riser ducts, cables in covered trays and cables in ducts, heat transfer mechanisms and heat transfer rates are greatly impacted by the installation geometries and environmental conditions. The thermal performance of cables installed in ducts is greatly dependent on the duct thickness, the cable laying method, and the surface coefficient of solar absorption in case of riser installation [20][21][22][23][24][25][26]. Overhead transmission line sections are usually connected with electrical components through a riser ensured on a pole and covered by a guard plastic duct to provide protection to the cables from mechanical damage.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the thermal analysis of power cables installed in polyvinyl chloride (PVC) ducts under continuous and cyclic current loading conditions

Gouda

Osman

2020

IET Generation Trans & Dist

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A study of the performance of power cables installed inside non‐metallic ducts is presented here. Cable capacity calculations for this type of installation are done. The thermal analysis of cables inside ducts which are installed in air as riser or buried in soils is presented. According to IEC 60287 cables can be installed in fibre ducts in concrete layer surrounded by the soil, in this article it is proposed to install the cables in PVC ducts directly buried in the soil. Based on IEC 60287‐1‐3 and IEC 60853‐2 standards proposed models in steady state and dynamic cable loadings are constructed. The proposed equivalent thermal models are used in the calculations of the cable components temperature for cables installed in ducts. It is concluded that very high increase in cable conductor temperature is observed when the cable is installed in duct and used as riser or even when it is installed in duct buried in soil. Significant decrease in the temperature of the cable conductor can be noticed when the cable is directly buried in the soil compared with that installed in ducts.

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Section: Results and Discussion Of Steady State Cable Loadingmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Enhancement of the thermal analysis of power cables installed in polyvinyl chloride (PVC) ducts under continuous and cyclic current loading conditions

Gouda

Osman

2020

IET Generation Trans & Dist

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“…Figure 6d shows a comparison between the approximation given by Equation ( 29) and the exact theoretical value given by Equation (26). It can be observed that both equations yield practically the same values, although Equation ( 29) results in slightly decreased values compared to the exact Equation ( 26), because the omitted terms O(κR) 12 and O(R/d) 4 are positive. Assuming κR = 1, the temperature increase due to the skin effect is around 2% compared to that for the DC case.…”

Section: Mean Temperature On Wire Surfacementioning

confidence: 93%

“…Experimental verification showed that the accuracy of the ETC (equivalent thermal circuit) method is higher than the IEEE and CIGRE standards. The thermal-electric analogy method was also widely used in [11][12][13][14]. The skin and proximity phenomena can also be approximately taken into account using appropriate correction factors [15,16].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Skin and Proximity Effects on the Thermal Field in Flat and Trefoil Three-Phase Systems with Round Conductors

Jabłoński,

Zaręba,

Szczegielniak

et al. 2024

Energies

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The passage of current generates heat and increases the temperature of electrical components, which affects the environment, support insulators and contacts. Knowledge of the temperature allows for the determination of important operational parameters. Time-varying currents result in a nonuniform current density distribution due to the skin and proximity effects. As a result, temperature and energy losses are increased compared to the uniform DC current density case. In this paper, these effects are considered for three-phase systems with round conductors in flat and trefoil arrangements. In the first step, the analytical expressions for current distributions are determined and used to construct the heat source density. Then, a suitable Green’s function, which allows for obtaining temperature distribution in analytical form, is used to evaluate temperature at any point throughout the conductors. The temperature differences throughout individual wires are usually negligible, whereas noticeable differences can be observed between the wires. The impact of various parameters is examined, and an approximate closed formula is derived to assess the influence of the skin and proximity effects. When the skin depth is not smaller than the wire radius, the skin effect enlarges the temperature increase by around 2% compared to the DC case. As for the proximity effect, the additional increase can be neglected if the distance is above around 10 wire radii, but for closely spaced wires, it can reach up to around 17%, depending on the arrangement and the distance between the wires. Such an additional increase may result in exceeding the permissible temperatures, which damages particular components of the system; therefore, it is important to take it into account at the design stage.

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“…Improved model networks have also been proposed for different geometric configurations in air considering physical parameters, such as emissivity and adequate heat dissipation coefficients [6]. Bragatto et al [29] presented a non-linear thermal model for a MV power cable joint, while Baker and de León [30] modeled non-vented vertical risers by Introduction equivalent thermal models. As concerns underground installations, an optimal RC ladder-type equivalent model was presented by Diaz-Aguiló and de León [31] in order to include the surrounding material of underground power lines.…”

Section: Introductionmentioning

confidence: 99%

Dynamic thermal modelling and characterisation of power lines

Chatzipanagiotou¹,

Χατζηπαναγιώτου²

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Σκοπός της διατριβής ήταν η δυναμική θερμική μοντελοποίηση και χαρακτηρισμός γραμμών μεταφοράς ηλεκτρικής ενέργειας. Για αυτόν τον σκοπό, αναπτύχθηκε η νέα μέθοδος Εκτίμησης Συνάρτησης Μεταφοράς (Transfer Function Estimation – TFE) για δυναμική θερμική ανάλυση. Η νέα μέθοδος καθώς και η υπάρχουσα μέθοδος Αναγνώρισης Δικτύων μέσω Αποσυνέλιξης (Network Identification by Deconvolution – NID) εφαρμόστηκαν για την επεξεργασία θερμοκρασιακών βηματικών αποκρίσεων θεωρητικών και πειραματικών διατάξεων γραμμών μεταφοράς ηλεκτρικής ενέργειας. Επίσης προτάθηκε μία νέα μέθοδος για τη μοντελοποίηση μονωμένων γραμμών μεταφοράς. Προτάθηκε επιπλέον ένα βελτιωμένο θερμικό μοντέλο για γραμμές μεταφοράς σε περίπτωση φυσικής συναγωγής. Τέλος, αναπτύχθηκε μία μαθηματική συσχέτιση μεταξύ αποκρίσεων λόγω επιβολής βηματικής ισχύος και βηματικού ηλεκτρικού ρεύματος.

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Equivalent circuit for the thermal analysis of cables in non‐vented vertical risers

Cited by 8 publications

References 9 publications

Enhancement of the thermal analysis of power cables installed in polyvinyl chloride (PVC) ducts under continuous and cyclic current loading conditions

Enhancement of the thermal analysis of power cables installed in polyvinyl chloride (PVC) ducts under continuous and cyclic current loading conditions

Influence of the Skin and Proximity Effects on the Thermal Field in Flat and Trefoil Three-Phase Systems with Round Conductors

Dynamic thermal modelling and characterisation of power lines

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