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

Yuan, Fan; Yuan, Zhao; Chen, Lixue; Wang, Yong; Liu, Junxiang; He, Junjia; Pan, Yuan

doi:10.3390/en10121989

Cited by 16 publications

(17 citation statements)

References 13 publications

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“…According to the initial parameters of the reactor in Table , if the heat and heat dissipation conditions of the inner encapsulations are basically same, it could realize the same temperature distribution of each encapsulation, so the “encapsulation‐air ducts unit” can be taken as the study object to reflect the temperature rise of the reactor . Considering that the diameter of the encapsulation is larger than the width of the air ducts for a large air‐core reactor, the unit can be considered equivalent to the vertical tube tank model, as shown in Fig.…”

Section: Thermal Optimization Of the Reactor With The Rain Covermentioning

confidence: 99%

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Thermal optimization for nature convection cooling performance of air core reactor with the rain cover

Yuan

Wang³

et al. 2018

IEEJ Transactions Elec Engng

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In this paper, a fluid‐thermal coupled finite element model is established to calculate the temperature rise of a dry type air‐core reactor, and it accuracy is verified by the experimental results obtained from a prototype. Taking the initial design parameters based on the equal height and the thermal flux design method, the detailed temperature field of the reactor is obtained both with and without the rain cover. It is shown that the maximum temperature rise of the inner encapsulations is different and higher after adding the rain cover. The reasons are given by analyzing the changes of the fluid velocity in the air ducts. In order to realize the same temperature rise and not more than the limit after adding the rain cover, two parameters of the rain cover are considered, which have five levels. The performance statistics analysis and optimal structure parameters of the rain cover are achieved. Meanwhile, a heat load optimization method is proposed for the inner encapsulations, and its correctness is validated by the temperature field simulation results. This is of great significance in guiding the thermal optimization of the reactor with rain cover. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Thermal Optimization Of the Reactor With The Rain Covermentioning

confidence: 99%

“…In Ref. , the maximum temperature rise of reactor, which is located on the top of encapsulation, can be equal to the sum of the average fluid temperature rise and the fluid–solid temperature difference. Thus, combined with the average fluid temperature rise calculation method in Ref.…”

Section: Thermal Optimization Of the Reactor With The Rain Covermentioning

confidence: 99%

Thermal optimization for nature convection cooling performance of air core reactor with the rain cover

Yuan

Wang³

et al. 2018

IEEJ Transactions Elec Engng

Self Cite

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“…, the resistance voltage drop equivalent method is applied to achieve the minimum loss of coils, and in Ref. , the ‘equal height and heat flux’ design method is used to implement the same temperature distribution of each encapsulation. However, the electromagnetic condition is neglected in Refs .…”

Section: Introductionmentioning

confidence: 99%

“…, the ‘equal height and heat flux’ design method is used to implement the same temperature distribution of each encapsulation. However, the electromagnetic condition is neglected in Refs . In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Refs , the design method combined with thermal and electromagnetic optimization is proposed, to realize the minimum use of the metal conductor, but the encapsulation number is not considered, which directly affects the electromagnetic efficiency and thermal efficiency of the reactor and limits the optimization results. Thus, the encapsulation number should be taken into account in the optimization design of the reactor.…”

Section: Introductionmentioning

confidence: 99%

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Research of electromagnetic and thermal optimization design on air core reactor

Yuan

Wang³

et al. 2018

IEEJ Transactions Elec Engng

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In this paper, the geometry-electromagnetic character, thermal condition of the coils, and encapsulation number are coupled in the optimization design of an air core reactor, to realize the minimum usage of metal conductor. Combined with the equality constraint conditions for maximum temperature rise conservation, inductance conservation, and structure function of the reactor, the optimization design curves and results are achieved based on the initial design parameters. According to the design results, the temperature field simulation model of the reactor is established, and the results verify the correctness of the optimization method. Compared with the design method of 'equal height and heat flux' and thermal-electromagnetic character without considering the change of encapsulation number, the proportionality factor of metal conductor usage is 0.73 with the optimization method. It shows that the optimization method can significantly improve the utilization ratio of the conductor. Meanwhile, the influence of regularity on the electromagnetic efficiency, thermal efficiency, and other parameters is also obtained.

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Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

Bian

Xia

et al. 2021

Polymer Composites

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In recent years, dry-type air-core reactors have frequently experienced inter-turn short circuits due to the aging of the inter-turn insulation. In this paper, we prepared epoxy/glass fiber samples and carried out an accelerated thermal aging test up to 840 hours. In different stages of aging, we tested the surface insulation properties, dielectric properties, thermal and mechanical properties of the samples. The results show that: Flashover voltage drops significantly, and when aging for 35 days, it has dropped by 12.4%. This is because aging is accompanied by the conversion of shallow traps to deep traps and the reduction of conductive channels, which slows down the charge dissipation rate and decreases the flashover voltage. Dielectric, thermal, and mechanical properties also show a deteriorating trend. Through the analysis of the changes in thermal and mechanical properties, it is inferred that thermal aging will damage the epoxy matrix more than the glass fiber. In addition, combined with the scanning electron microscope, Fourier transform infrared spectrometer, and X-ray photoelectron spectrometer characterization results, we believed that the main reason for the material deterioration is the detachment of the glass fiber and the break of the long chain of the matrix. This article has certain reference value for the subsequent engineering application and online monitoring of this material.

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

Cited by 16 publications

References 13 publications

Thermal optimization for nature convection cooling performance of air core reactor with the rain cover

Thermal optimization for nature convection cooling performance of air core reactor with the rain cover

Research of electromagnetic and thermal optimization design on air core reactor

Thermal‐aging characteristics of epoxy/glass fiber composite materials fordry‐typeair‐core reactors

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