Transient thermal analysis of underground power cables using two dimensional finite element method

Naskar, Ashok Kumar; Bhattacharya, N. K.; Sarkar, Debasis

doi:10.1007/s00542-017-3500-z

Cited by 9 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rerak and Ocłoń [11] had studied the heat transfer characteristics of directly buried cables with finite element method (FEM), where the effect of temperature-dependent thermal conductivities of soil and backfill material was considered. Naskar et al [12] had developed a transient computational code with FEM for threecore cable, which could predict the transient temperature distribution in the cable quickly and accurately. In addition, in the study of Al-Saud [13], the FEM-PSO method was used to optimize the three-core cable cross-sections, and the optimum dimensions were obtained.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Convection and Radiation Heat Transfer in Pipe Cable

Quan

et al. 2018

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Pipe cable is considered as an important form for underground transmission line. The maximum electrical current (ampacity) of power cable system mostly depends on the cable conductor temperature. Therefore, accurate calculation of temperature distribution in the power cable system is quite important to extract the cable ampacity. In the present paper, the fluid flow and heat transfer characteristics in the pipe cable with alternating current were numerically studied by using commercial code COMSOL MULTIPHYSICS based on finite element method (FEM). The cable core loss and eddy current loss in the cable were coupled for the heat transfer simulation, and the difference of heat transfer performances with pure natural convection model and radiationconvection model was compared and analysed in detail. Meanwhile, for the radiation-convection model, the effects caused by radiant emissivity of cable surface and pipe inner surface, as well as the cable location in the pipe, were also discussed. Firstly, it is revealed that the radiation and natural convection heat flux on the cable surface would be of the same order of magnitude, and the radiation heat transfer on the cable surface should not be ignored. Otherwise, the cable ampacity would be underestimated. Secondly, it is found that the overall heat transfer rate on the cable surface increases as the cable surface emissivity increases, and this is more remarkable to the upper cable. While the effect caused by the radiant emissivity on the pipe inner surface would be relatively small. Furthermore, it is demonstrated that, as cable location in the pipe falls, the natural convection heat transfer would be enhanced. These results would be meaningful for the ampacity prediction and optimum design for the pipe cable.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Study of Convection and Radiation Heat Transfer in Pipe Cable

Quan

et al. 2018

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Moreover, it is possible to solve the heat flow equation in different coordinate systems by separating the variables only when the internal heat generation is null. Therefore, only a limited number of geometries and boundary conditions can be studied with this approach [90]. Some techniques to partially overcome this problem have recently been proposed.…”

Section: Methodsmentioning

confidence: 99%

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

2020

View full text Add to dashboard Cite

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.

show abstract

“…The one-dimensional (1D) network was adopted for the cable temperature estimation [11][12][13], whereas in the case of cable joint, a 2D RC analogue was normally chosen with the subdivision of the joint into a number of elemental cylindrical volumes, and the effectiveness of the thermal network was validated by the temperature-rise test [14,15]. With the improvement of mesh generation and post-processing capabilities, FEM has been widely used in the thermophysics and heat engineering [16][17][18][19][20]. By using transient FEM for thermal analysis, the hot spot temperature rise of 110 kV cable joint has been calculated within an acceptable error range [21].…”

Section: Introductionmentioning

confidence: 99%