Calculation of the loading capacity of high voltage cables laid in close proximity to heat pipelines using iterative finite-element method

Nahman, J.; Tanaskovic, M.

doi:10.1016/j.ijepes.2018.05.031

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…When the system is represented by using a large number of connected nodes, a crucial issue appears for the creation of a nonregular mesh aimed at reducing the computational burden and improving the effectiveness of the result representation. However, only FEM allows the simulation of complex scenarios, such as those characterised by the presence of multiple circuits [75], ground surface heat [76], cable trench profile [77], concrete and asphalt cover [78][79][80], and mixtures for bedding in a multilayered soil represented in 2D [39]. In steady-state, the FEM minimises a given functional, subject to a set of boundary constraints [81].…”

Section: Methodsmentioning

confidence: 99%

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

et al. 2021

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With the increase in the electrical load and the progressive introduction of power generation from intermittent renewable energy sources, the power line operating conditions are approaching the thermal limits. The definition of thermal limits variable in time has been addressed under the concept of dynamic thermal rating (DTR), with which it is possible to provide a more detailed assessment of the line rating and exploit the electrical system more flexibly. Most of the literature on DTR has addressed overhead lines exposed to different weather conditions. The interest in the dynamic thermal rating of power cables is increasing, considering the evolution of computational methods and advanced systems for cable monitoring. This paper contains an overview of the concepts and methods referring to dynamic cable rating (DCR). Starting from the analytical formulations developed many years ago for determining the power cable rating in steady-state conditions, also reported in International Standards, this paper considers the improvements of these formulations proposed during the years. These improvements are leading to include more specific details in the models used for DCR analysis and the computational methods used to assess the power cable’s thermal conditions buried in soil. This paper is focused on highlighting the path from the initial theories and models to the latest literature contributions. Attention is paid to thermal modelling with different levels of detail, applications of 2D and 3D solvers and simplified models, and their validation based on experimental measurements. A salient point of the overview is considering the DCR impact on reliability aspects, risk estimation, real-time calculations, forecasting, and planning with different time horizons.

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Section: Methodsmentioning

confidence: 99%

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

et al. 2021

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“…In this case, at any point in the soil the transient temperature T(τ) is expressed by using Equation ( 5) having the solution indicated in Equation ( 6). The principal issue of this analytical approach is that inhomogeneity of materials and cable structures cannot be taken into account [89]. 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.…”

Section: Methodsmentioning

confidence: 99%

“…However, only FEM allows the simulation of complex scenarios. In particular, FEM is adopted to investigate the impacts of the trench geometry and of the backfill material type and formation, such as for example the presence of multiple circuits [97], ground surface heat [89], cable trench profile [98], concrete and asphalt cover [76,99,100], and mixtures for bedding [101].…”

Section: Methodsmentioning

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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“…Additionally, the authors of [16] propose a methodology to optimize the thermal performance of power cables based on configuration parameters. Research has also explored the impact of controlled backfill quantity on native soil thermal resistivity [13,19] and the ampacity of high-voltage cables in relation to cable spacing, burial depth, and backfill size [20][21][22]. Recent studies, such as those by [23,24], have employed algorithms like PSO, Jaya, MJaya, and NSGA-III for multi-objective optimization, ranging from backfill cost minimization to improving the thermal environment in underground lines.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Ampacity in High-Voltage Underground Cables with Thermal Backfill Using Dynamic PSO and Adaptive Strategies

Atoccsa,

Puma,

Mendoza

et al. 2024

Energies

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This article addresses challenges in the design of underground high-voltage transmission lines, focusing on thermal management and cable ampacity determination. It introduces an innovative proposal that adjusts the dimensions of the backfill to enhance ampacity, contrasting with the conventional approach of increasing the core cable’s cross-sectional area. The methodology employs a particle swarm optimization (PSO) technique with adaptive penalization and restart strategies, implemented in MATLAB for parameter autoadaptation. The article emphasizes more efficient solutions than traditional PSO, showcasing improved convergence and precise results (success probability of 66.1%). While traditional PSO is 81% faster, the proposed PSO stands out for its accuracy. The inclusion of thermal backfill results in an 18.45% increase in cable ampacity, considering variations in soil thermal resistivity, backfill properties, and ambient temperature. Additionally, a sensitivity analysis was conducted, revealing conservative values that support the proposal’s robustness. This approach emerges as a crucial tool for underground installation, contributing to continuous ampacity improvement and highlighting its impact on decision making in energy systems.

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Calculation of the loading capacity of high voltage cables laid in close proximity to heat pipelines using iterative finite-element method

Cited by 14 publications

References 5 publications

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

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

Optimization of Ampacity in High-Voltage Underground Cables with Thermal Backfill Using Dynamic PSO and Adaptive Strategies

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