Thermal modelling and analysis of high‐voltage insulated power cables under transient loads

Aras, Faruk; Biçen, Yunus

doi:10.1002/cae.20497

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…Presently, XLPE is widely used in submarine cables due to its good electrical and thermomechanical behaviors and relatively low cost [ 14 ]. The maximum heat-resistant operating temperature of XLPE insulation is 90 °C and the overload temperature should be less than 105 °C [ 15 ] in order to avoid premature aging of the dielectric [ 16 ]. If one or more copper wires are broken and/or permanently deformed in the core, it leads to upshoot of the temperature of the core [ 7 ], and once the core rises above 90 °C, the whole system shuts down.…”

Section: Introductionmentioning

confidence: 99%

Concept of Placement of Fiber-Optic Sensor in Smart Energy Transport Cable under Tensile Loading

Drissi‐Habti

Abhijit

Manepalli

et al. 2022

Sensors

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Due to the exponential growth in offshore renewable energies and structures such as floating offshore wind turbines and wave power converters, the research and engineering in this field is experiencing exceptional development. This emergence of offshore renewable energy requires power cables which are usually made up of copper to transport this energy ashore. These power cables are critical structures that must withstand harsh environmental conditions, handling, and shipping, at high seas which can cause copper wires to deform well above the limit of proportionality and consequently break. Copper, being an excellent electric conductor, has, however, very weak mechanical properties. If plasticity propagates inside copper not only will the mechanical properties be affected, but the electrical properties are also disrupted. Constantly monitoring such large-scale structures can be carried out by providing continuous strain using fiber-optic sensors (FOSs). The embedding of optical fibers within the cables (not within the phase) is practiced. Nevertheless, these optical fibers are first introduced into a cylinder of larger diameter than the optical fiber before this same fiber is embedded within the insulator surrounding the phases. Therefore, this type of embedding can in no way give a precise idea of the true deformation of the copper wires inside the phase. In this article, a set of numerical simulations are carried-out on a single phase (we are not yet working on the whole cable) with the aim of conceptualizing the placement of FOSs that will monitor strain and temperature within the conductor. It is well known that copper wire must never exceed temperatures above 90 °C, as this will result in shutdown of the whole system and therefore result in heavy maintenance, which would be a real catastrophe, economically speaking. This research explores the option of embedding sensors in several areas of the phase and how this can enable obtaining strain values that are representative of what really is happening in the conductor. It is, therefore, the primary objective of the current preliminary model to try to prove that the principle of embedding sensors in between copper wires can be envisaged, in particular to obtain an accurate idea about strain tensor of helical ones (multi-parameter strain sensing). The challenge is to ensure that they are not plastically deformed and hence able to transport electricity without exceeding or even becoming closer to 90 °C (fear of shutdown). The research solely focuses on mechanical aspects of the sensors. There are certainly some others, pertaining to sensors physics, instrumentation, and engineering, that are of prime importance, too. The upstream strategy of this research is to come up with a general concept that can be refined later by including, step by step, all the aspects listed above.

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Section: Introductionmentioning

confidence: 99%

Concept of Placement of Fiber-Optic Sensor in Smart Energy Transport Cable under Tensile Loading

Drissi‐Habti

Abhijit

Manepalli

et al. 2022

Sensors

View full text Add to dashboard Cite

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“…Although this model allows the temperature rise of the cable to be determined, its accuracy is limited, in part because of the poor level of discretization, and in part, because it neglects the temperature dependency of the main parameters of the cable (thermal conductivity, specific heat capacity and electric resistivity). Similar approaches based on lumped parameter thermal networks are presented in [ 18 , 19 , 20 , 21 ], with similar limitations. In [ 22 ], an approach to calculate the transient temperature of a single-core insulated cable using an analytic approach is presented, but the model does not include the jacket and different simplifications are performed in order to solve the differential equations arising from the model.…”

Section: Introductionmentioning

confidence: 99%

A Model to Calculate the Current–Temperature Relationship of Insulated and Jacketed Cables

Ruiz

Llauradó

2022

Materials

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This paper proposes and validates using experimental data a dynamic model to determine the current–temperature relationship of insulated and jacketed cables in air. The model includes the conductor core, the inner insulation layer, the outer insulating and protective jacket and the air surrounding the cable. To increase its accuracy, the model takes into account the different materials of the cable (conductor, polymeric insulation and jacket) and also considers the temperature dependence of the physical properties, such as electrical resistivity, heat capacity and thermal conductivity. The model discretizes the cable in the radial direction and applies the finite difference method (FDM) to determine the evolution over time of the temperatures of all nodal elements from the temperatures of the two contiguous nodes on the left and right sides. This formulation results in a tri-diagonal matrix, which is solved using the tri-diagonal matrix algorithm (TDMA). Experimental temperature rise tests at different current levels are carried out to validate the proposed model. This model can be used to simulate the temperature rise of the cable when the applied current and ambient temperature are known, even under short-circuit conditions or under changing applied currents or ambient temperatures.

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“…The heat sources are inserted as per unit volume or area in thermal equations. Thus determination of precise value and distribution of losses in cables are crucial to ampacity calculations . Also accurate computation of losses is very important for energy efficiency and better use of the installed equipment .…”

Section: Introductionmentioning

confidence: 99%

Losses distribution in sheathed power cables under non‐sinusoidal currents using numerical method

Rasoulpoor

Mirzaie

Mirimani

2016

Comp Applic In Engineering

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This paper presents losses distribution in power cables conductors and metallic sheaths. Losses are computed in sinusoidal and non‐sinusoidal currents with considering all sequences harmonics. Two numerical methods as finite element and integral method are used to determine the distributions and also total harmonic losses. Thus skin and proximity effects of all metallic parts of cables are considered accurately. Integral method is utilized for losses calculation by considering of earth return path and eliminating it. Furthermore, IEC formulations are used for losses computations. Numerical results suggest inserting the earth return path effect on cable losses in some harmonic frequencies of currents. Power cables are assumed to be single core medium voltage type. Lead sheaths of cables are bonding together and grounded at both ends for calculation of circulating current losses. Also the effects of different distances between cables in losses calculations are assessed. For validation of integral method, finite element simulation, as proven method in accurate power cable losses computations is used. These methods are completely described in this paper. Accuracy of integral method for harmonic losses computations of conductor and sheaths is verified by finite element simulation results. Also it is shown that proximity and skin effects are considered very well by integral method even in metallic sheaths. © 2016 Wiley Periodicals, Inc. Comput Appl Eng Educ 24:692–705, 2016; View this article online at http://www.wileyonlinelibrary.com/journal/cae; DOI

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Thermal modelling and analysis of high‐voltage insulated power cables under transient loads

Cited by 13 publications

References 9 publications

Concept of Placement of Fiber-Optic Sensor in Smart Energy Transport Cable under Tensile Loading

Concept of Placement of Fiber-Optic Sensor in Smart Energy Transport Cable under Tensile Loading

A Model to Calculate the Current–Temperature Relationship of Insulated and Jacketed Cables

Losses distribution in sheathed power cables under non‐sinusoidal currents using numerical method

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