Cooling of Electrical Cu Conductor with PVC Insulation – Analytical, Numerical and Fluid Flow Solution

Goga, Vladimír; Paulech, Juraj; Vary, Michal

doi:10.2478/jee-2013-0013

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…where L{du/dx} and L{di/dx} are the Laplace transforms of the partial derivative over time for voltage and current, respectively; I(x, s) and U(x, s) are the Laplace transforms on the long line of current and voltage, respectively; and s is the Laplace transform operator. The voltage and current equation transforms take the form [23][24][25] U…”

Section: Modelling the Heating Up Of Electrical Cablesmentioning

confidence: 99%

A Method for Determining the Impact of Ambient Temperature on an Electrical Cable during a Fire

Perka

Piwowarski

2021

Energies

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Evaluating environmental conditions that trigger fire-fighting equipment is one of the primary design tasks that have to be taken into account when engineering electrical systems supplying such devices. All of the solutions are aimed at, among others, preserving environmental parameters in a building being on fire for an assumed time and at a level enabling safe evacuation. These parameters include temperature, thermal radiation, visibility range, oxygen concentration, and environmental toxicity. This article presents a new mathematical model for heat exchange between the environment and an electric cable under thermal conditions exceeding permissible values for commonly used non-flammable installation cables. The method of analogy between thermal and electrical systems was adopted for modelling heat flow. Determining how the thermal conductivity of the cable and the thermal capacity of a conductor-insulation system can be applied to calculate the wire temperature depending on the heating time t and distance x from the heat source is discussed. Thermal conductivity and capacity were determined based on experimental tests for halogen-free flame-retardant (HFFR) cables with wire cross-sections of 2.5, 4.0, and 6.0 mm2. The conducted experimental tests enable verifying the results calculated by the mathematical model.

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Section: Modelling the Heating Up Of Electrical Cablesmentioning

confidence: 99%

A Method for Determining the Impact of Ambient Temperature on an Electrical Cable during a Fire

Perka

Piwowarski

2021

Energies

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“…For ampacity calculations in multi-strand cable lines placed in free air at indoor conditions (when it is possible to neglect the fluid flow affecting heat transfer conditions) the mutual coupling between electromagnetic and thermal fields is of paramount importance. Goga et al carried out numerical computations concerning cooling of a single electrical conductor with insulation [41]. Li and coworkers computed temperature distribution and power losses for typical (flat and trefoil) three phase single strand cable configurations using a simplified 2D FEM cable model [42].…”

Section: Literature Review Concerning Ampacity Computationmentioning

confidence: 99%

A Multiphysics Analysis of Coupled Electromagnetic-Thermal Phenomena in Cable Lines

Cywiński¹,

Chwastek

2021

Energies

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The paper is focused on numerical modeling of multi-strand cable lines placed in free air. Modeling is carried out within the framework of the so-called multi-physics approach using commercial software. The paper describes in detail the steps undertaken to develop realistic, reliable numerical models of power engineering cables, taking into account their geometries and heat exchange conditions. The results might be of interest to the designers of multi-strand cable systems.

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“…The cooling of electronic component becomes an active field of research [1][2][3][4]. For high thermal dissipation system, the cooling by natural convection is not sufficient, and the forced convection using electrical Fan or piezoelectric vibration beams is important to reduce the hot spot temperature inside power supply box.…”

Section: Introductionmentioning

confidence: 99%

Forced Convection during Cooling of Power Supply Box using Pulsation Flow with Piezoelectric Fan

Bouttout

2023

IEEJ Transactions Elec Engng

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Forced convection flow of air through power supply box with piezoelectric fan of nine identical electrical devices has been numerically investigated. This work simulates a practical situation in which periodic temperature is generated in an electrical device as a result of its periodic input voltage. The finite volume method has been adopted to solve the governing equations. The effects of important parameters such as pulsation flow frequencies and temperature modulation frequency on heat transfer rates were investigated in details for Re = 500 corresponding to velocity of 0.39 m/s. The piezoelectric vibration amplitude is fixed at 0.2 and frequencies are varied in the range of [0–3] corresponding to [0–287] Hz. We have found that the time averaged Nusselt number for each electrical device depends on the pulsation frequency and heat modulation, and it is always larger than that in the steady‐state case. The results show that there exists a short band of frequencies which the enhancement of heat transfer of all electrical devices is higher than 55% compared with that of steady state. In addition, the heat transfer is maximum when heated pulsation frequency in the device is set as St = 3.0 corresponding to frequency of 58.5 Hz of input voltage. The combined pulsation flow by piezoelectric fan and heated pulsation by input voltage show vigorous heat transfer through electrical devices blocks and the heat transfer enhancement was observed in relatively narrow bands of frequencies. The efficiency of piezoelectric fan is expressed by the maximum temperature of the ninth electrical device which not exceed 80°C for time‐averaged velocity of 0.556 m/s and vibration frequency of 34.75 Hz of piezoelectric fan. The pressure drop and power pumping of piezoelectric fan are obtained for different Reynolds numbers. We found that the power loss was 4.6 times higher than for the piezoelectric fan at Re = 500. Good agreement between our numerical simulations of piezoelectric fan and experimental results available from the literature is obtained. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Cooling of Electrical Cu Conductor with PVC Insulation – Analytical, Numerical and Fluid Flow Solution

Cited by 7 publications

References 5 publications

A Method for Determining the Impact of Ambient Temperature on an Electrical Cable during a Fire

A Method for Determining the Impact of Ambient Temperature on an Electrical Cable during a Fire

A Multiphysics Analysis of Coupled Electromagnetic-Thermal Phenomena in Cable Lines

Forced Convection during Cooling of Power Supply Box using Pulsation Flow with Piezoelectric Fan

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