Thermal behaviour of medium-voltage underground cables under high-load operating conditions

Bustamante, Sergio; Minguez, Rafael; Arroyo, Alberto; Canteli, Mario Mañana; Laso, Alberto; Castro, P.; Martínez, Raquel

doi:10.1016/j.applthermaleng.2019.04.083

Cited by 32 publications

(16 citation statements)

References 17 publications

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“…Experiments have been reported in the literature to show the effects of the presence of dry zones around the cable [13,55,56]. Bustamante et al [55] performed an experimental and numerical analysis of the medium-voltage underground cable analysing the cable ampacity in the function of the soil conductivity for different soils (wet, dry, very dry soil) and cable depth. The values obtained were compared with the values from the standard IEC 60287-1-1 [51].…”

Section: Soil Thermal Conductivitymentioning

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: Soil Thermal Conductivitymentioning

confidence: 99%

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

et al. 2021

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“…While exceeding maximum standard operating temperatures is possible for some networks, there are disadvantages, such as decreasing the network's maximum possible load. The elevated substrate temperatures can also accelerate aging of buried infrastructure (e.g., de Leon et al 2006;Bustamante et al 2019). As buried infrastructure depths can vary from slightly above ground (e.g., when a gravity-driven pipe is exposed above ground; R. Roberts, pers.…”

Section: Thermal Operating Conditions Of Buried Infrastructure Networkmentioning

confidence: 99%

“…Wrapping cables in thicker or different insulation (Terpe 2017; Eland Cables n.d.): Alternative insulation and bedding materials can be placed during installation. A downside is that making the cables more insulated will negatively affect the cables' standard operations (de Leon et al 2006;Salata et al 2015;Bustamante et al 2019). Changing the bedding of the cables (Ocłoń et al 2015; 2016): Similar to insulation, the bedding of the cables (i.e., the materials in which the cables are buried) can influence how the cables heat and cool.…”

Section: Mitigation Measures For Buried Electricity Networkmentioning

confidence: 99%

Thermal impacts of basaltic lava flows to buried infrastructure: workflow to determine the hazard

et al. 2020

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Lava flows can cause substantial physical damage to elements of the built environment. Often, lava flow impacts are assumed to be binary, i.e. cause complete damage if the lava flow and asset are in contact, or no damage if there is no direct contact. According to this paradigm, buried infrastructure would not be expected to sustain damage if a lava flow traverses the ground above. However, infrastructure managers ("stakeholders") have expressed concern about potential lava flow damage to such assets. We present a workflow to assess the thermal hazard posed by lava flows to buried infrastructure. This workflow can be applied in a pre-defined scenario. The first step in this workflow is to select an appropriate lava flow model(s) and simulate the lava flow's dimensions, or to measure an in situ lava flow's dimensions. Next, stakeholders and the modellers collaborate to identify where the lava flow traverses buried network(s) of interest as well as the thermal operating conditions of these networks. Alternatively, instead of direct collaboration, this step could be done by overlaying the flow's areal footprint on local infrastructure maps, and finding standard and maximum thermal operating conditions in the literature. After, the temperature of the lava flow at the intersection point(s) is modelled or extracted from the results of the first step. Fourth, the lava flow-substrate heat transfer is calculated. Finally, the heat transfer results are simplified based on the pre-identified thermal operating conditions. We illustrate how this workflow can be applied in an Auckland Volcanic Field (New Zealand) case study. Our case study demonstrates considerable heat is transferred from the hypothetical lava flow into the ground and that maximum operating temperatures for electric cables are exceeded within 1 week of the lava flow front's arrival at the location of interest. An exceedance of maximum operating temperatures suggests that lava flows could cause thermal damage to buried infrastructure, although mitigation measures may be possible.

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“…The electricity transmission losses, in the form of generated heat, depend on the cable core electric resistance and transmitted electrical current [1,2]. Accurate analysis of heat dissipation from the underground power cables to the surrounding soil plays a crucial role in designing the electricity transmission lines for modern power systems [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Heat Transfer Model in Underground Power Cable Systems

et al. 2020

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This paper presents the laboratory test stand that is used for experimental validation of underground power cable system models. Determination of temperature distribution in the vicinity of the cable is the main goal of the study. The paper considers a system of three power cables, situated in the in-line arrangement, and buried in sand. Three electrical heaters of special construction are used in order to simulate the heat flux that is generated in the power cables during their operation. The test stand is designed to be placed in a thermoclimatic chamber, which allows testing the system in various thermal conditions when the ambient temperature changes by 20 °C to 30 °C. Numerical computations of the steady-state temperature fields are performed using the finite element method.

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Thermal behaviour of medium-voltage underground cables under high-load operating conditions

Cited by 32 publications

References 17 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 impacts of basaltic lava flows to buried infrastructure: workflow to determine the hazard

Experimental Validation of a Heat Transfer Model in Underground Power Cable Systems

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