Thermal Analysis of Air-Core Power Reactors

In this paper, according to the parameters of the dry type air core smoothing reactor, the stress-sound field and fluid-temperature field coupling simulation model is established, the detailed temperature field and sound field distribution are obtained, and the influence law of sound arrester on the sound pressure level and temperature rise are analyzed. It can be found that the temperature rise of encapsulation coils are significantly increased when adding the sound arrester, and the reasons are given by analyzing the fluid velocity in the air ducts. Meanwhile, the optimization design method about sound arrester is proposed based on the orthogonal experiment design and finite element method. The influence curve and contribution rate of sound arrester on the pressure level and temperature rise are analyzed, and the optimal structural parameters of the sound arrester are obtained. The results show that the optimization method can significantly reduce the temperature rise and sound pressure level simultaneously, and improving the operational reliability of the smoothing reactor.

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“…The heat dissipation process of reactor mainly involves: the heat conduction, heat convection and thermal radiation [17,18].…”

Section: The Fluid‐temperature Field Simulation Resultsmentioning

confidence: 99%

The Optimization Design of Sound Arrester for the Dry Type Air Core Smoothing Reactor Based on the Multi‐Physical Field Coupling Method

Yuan

Yang

Qin

et al. 2021

IEEJ Transactions Elec Engng

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“…Therefore, heat conduction is neglected. Furthermore, the low emissivity coefficients of aluminium (0.05-0.2), together with the fact that heat radiation only occurs at the top and bottom sides of the reactor, as well as at the outer surface of the outermost cylinder, enables the disregard for radiation effects [33]. Two boundary conditions (BCs), see Figure 12, are defined: Convection (BC1) and external limit temperature (BC2).…”

Section: Aluminium (Windings)mentioning

confidence: 99%

Thermal Analysis of Dry-Type Air-Core Coils for the Optimization of Passive Filtering Systems

et al. 2020

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The analysis of harmonic currents in distribution networks of industrial facilities and the associated filtering stages is essential to optimize the production of these installations. Dry-type air-core reactors are one of the main elements of harmonic filter banks. A thermal analysis of these reactors in conventional steel plants and an evaluation of the criteria used to adjust the corresponding thermal protections are proposed in this paper. Accordingly, harmonic currents through the different filter branches are assessed. The proposed methodology builds a thermal magnetic model using the finite element method (FEM) whereby electromagnetic fields, currents and losses are emulated, to allow for recreating the actual coil temperature. The study aims at increasing the reliability of filtering systems by lowering the number of unscheduled shutdowns due to conservative adjustments of thermal protections.

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“…The boundary conditions of the simulation model are set as follows [27,28]: The radial velocity of fluid in the axis of symmetry is zero, the surface of the encapsulations is a static wall, the radial and axial velocities are zero. In the above boundary of the model, the pressure, fluid velocity, and temperature are defined variables.…”

Section: Simulation Verificationmentioning

confidence: 99%

Thermal and Electromagnetic Combined Optimization Design of Dry Type Air Core Reactor

Yuan

Chen

et al. 2017

Energies

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Abstract:In this paper, taking the minimum metal conductor usage of an air core reactor as optimization goal, the influence of air ducts width and encapsulation number on thermal efficiency and electromagnetic efficiency are analyzed. Combined with the equation constraint conditions for maximum temperature rise conservation, inductance conservation and structure function of reactor considering the change of air ducts width and encapsulation number, the thermal and electromagnetic combined optimization curves are formed, and design results are achieved based on the initial design parameters. Meanwhile, the temperature field simulation model of the reactor is established and the results verify the correctness of the optimization method. According to the design results, the proportionality factor of metal conductor usage is only 0.61 compared with the initial design parameters of the reactor, which shows that the proposed comprehensive optimization method can significantly reduce conductor usage, improving the metal conductor utilization ratio.

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Thermal Analysis of Air-Core Power Reactors

Cited by 12 publications

References 15 publications

The Optimization Design of Sound Arrester for the Dry Type Air Core Smoothing Reactor Based on the Multi‐Physical Field Coupling Method

The Optimization Design of Sound Arrester for the Dry Type Air Core Smoothing Reactor Based on the Multi‐Physical Field Coupling Method

Thermal Analysis of Dry-Type Air-Core Coils for the Optimization of Passive Filtering Systems

Thermal and Electromagnetic Combined Optimization Design of Dry Type Air Core Reactor

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