Full-scale case study of a road crossing thermal bottleneck in a buried medium-voltage cable installation

Eberg, Espen; Espeland, Kåre; Hellesø, Svein Magne; Hvidsten, Sverre

doi:10.1049/oap-cired.2017.0820

Cited by 3 publications

(3 citation statements)

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“…The width at the trench base was 3.3 m and at the asphalt 6.5 m, giving a trapezoid shape of the trench. Details of the construction of the different layers in the road-crossing and ambient conditions have been reported in [22].…”

Section: A Backgroundmentioning

confidence: 99%

“…Correct description of the heat transfer by convection is by many considered the most challenging task and is also a part of the FEA that requires most computational power. By combining computationally simplified models with a pre-built graphical user interface, cable rating calculations applying FEA can be adopted by practitioners and utilities in a simple way [13].…”

Section: Introductionmentioning

confidence: 99%

“…Schematic of road crossing constructed according to Norwegian Road Authorities Specification. Ref [22]…”

mentioning

confidence: 99%

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Simplified Model for Heat Transport for Cables in Pipes

Helles

Eberg

2022

IEEE Trans. Power Delivery

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This paper addresses challenges with modeling of heat transfer phenomenon for cables in duct or pipes when applying a numerical solution. Heat transport mechanisms between the cable and pipe surfaces are conduction, convection and radiation. Numerical calculation of convection when applying a finite element analysis (FEA), or other numerical tools requires heavy computation power and great skills of the program operator. In general, this is the most difficult part when modeling the heat transfer between the cable and the pipe surfaces and practitioners are often forced to use simplifications or approximate models. This paper introduces a simplified model where the contribution from convection is replaced by a heat source at the pipe wall and a corresponding heat sink at the cable. The phenomenon of air rising vertically in the tube resulting in the upper half of the pipe being heated more by convection than the lower half is also modelled. The simplified model is compared to both known models from thermodynamics, FEA including convection and laboratory as well as the full-scale field measurements. The simplified model shows good correspondence to both simulations and measurements, with the temperatures deviating by less than 1 o C.

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Section: A Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%