Improvements on Thermal Performance of Power Transformers: Modelling and Testing

Gamil, Ahmed; Al-Abadi, Ali; Schiessl, M.; Schatzl, F.; Schlücker, Eberhard

doi:10.23919/arwtr.2019.8930180

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Each loop represents a winding (or a single layer of a winding) and the tank wall fins. The heat gained from the winding to the coolant oil is governed by the convection heat transfer coefficient and the heat dissipation is balanced with the total of the ohmic and eddy current losses [22,23]:…”

Section: Thermal-hydraulic Modelmentioning

confidence: 99%

“…where . The heat transferred into the oil will be dissipated through the tank wall fins into the ambient air which can then be calculated by integrating the differential energy equilibrium equation of oil filled in the fins [14,22]: For the steady-state condition and applying the energy balance of the heat that enters the fins which shall be dissipated by the fins to the ambient [23,24], we obtain the following:…”

Section: Thermal-hydraulic Modelmentioning

confidence: 99%

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A Combined Computational Fluid Dynamics and Thermal–Hydraulic Modeling Approach for Improving the Thermal Performance of Corrugated Tank Transformers: A Comparative Study

Wang,

Sun,

Al-Abadi

et al. 2024

Energies

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In this study, we present a complete analysis of the thermal behavior of an oil-filled distribution transformer using two different approaches: numerically, by applying computational fluid dynamics (CFD) simulations; and analytically, by using thermal–hydraulic modelling (THM). The THM method becomes challenging when the corrugated transformer tank wall structures are complex, and therefore CFD simulations are required to provide in-depth details of the winding oil thermal–hydraulic behavior and to generate parameters for improving the THM calculation. The numerical and analytical thermal performance results were then compared with heat-run measurements of a case study transformer and the accuracy of both approaches on different thermal performance parameters was validated. This study has certain reference value for improving the thermal performance and operation efficiency of distribution transformers, and eventually aims to provide engineers with an effective tool to design the most efficient and reliable distribution transformers with corrugated tank walls for various applications.

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Section: Thermal-hydraulic Modelmentioning

confidence: 99%

Section: Thermal-hydraulic Modelmentioning

confidence: 99%

A Combined Computational Fluid Dynamics and Thermal–Hydraulic Modeling Approach for Improving the Thermal Performance of Corrugated Tank Transformers: A Comparative Study

Wang,

Sun,

Al-Abadi

et al. 2024

Energies

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“…The results showed that the use of an obstacle placed near the inlet of the transformer improved the performance of the transformer because it helped direct the oil flow and cooled the active parts. Kim et al [22] numerically and experimentally investigated the performance characteristics of two types of power transformer: oil natural air natural (ONAN) and oil-directed forced air natural (ODAN). A comparison of the performance characteristics between the ONAN and the ODAN transformers was conducted on the basis of the cooling capacity, the temperature difference between the top and the bottom of the transformer, and the distribution of the coolant temperatures.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Thermal Performance Characteristics of an Electrical Power Transformer

Azbar

Jaffal

Freegah

2020

Engineering Science & Technology

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A 3D numerical simulation was conducted to test the effects of the geometrical and operational parameters on the cooling performance of a three-phase electrical distribution transformer (250 kVA oil natural air natural (ONAN)). The geometric parameters include the shape of the transformer (rectangular, circular, and hexagonal), fins shape (rectangular, semicircular, and trapezoidal) as well it arrangement (asymmetric fin heights and perforated fins). Both of oil temperature and thermal load have been used as boundary conditions. In order to verify the reliability of the numerical model, comparison between numerical results and experimental finding has been done. The results have indicated that the circular and hexagonal shapes reduced the average oil temperature by 3.4% and 4.7%, respectively, compared to the traditional transformer shape (rectangular). Furthermore, the lowest average oil temperature was observed for the trapezoidal fin, followed by the rectangular and semicircular fins. Additionally, it has been noticed that the asymmetric fin heights of the trapezoidal and perforated trapezoidal fins been contributed to the improvement of the cooling performance of the transformer. Furthermore, the best thermal performance was obtained with the trapezoidal perforated fin to compared other arrangement of fins. Finally, the highest reduction in oil has been obtained by the use of hexagonal transformer with a perforated trapezoidal fin approximately by 12% compared to traditional rectangular transformer. Hence, it can be concluded that the shape of the transformer and fins play an important role in thermal performance of such systems.

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On Challenges of Using Natural Ester Insulating liquid: Transformer Cold Start

Gamil,

Al-Abadi,

Knuts

et al. 2024

2024 IEEE Electrical Insulation Conference (EIC)

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Improvements on Thermal Performance of Power Transformers: Modelling and Testing

Cited by 5 publications

References 9 publications

A Combined Computational Fluid Dynamics and Thermal–Hydraulic Modeling Approach for Improving the Thermal Performance of Corrugated Tank Transformers: A Comparative Study

A Combined Computational Fluid Dynamics and Thermal–Hydraulic Modeling Approach for Improving the Thermal Performance of Corrugated Tank Transformers: A Comparative Study

Enhancement of the Thermal Performance Characteristics of an Electrical Power Transformer

On Challenges of Using Natural Ester Insulating liquid: Transformer Cold Start

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