A top-oil thermal model for power transformers that consider weather factors
A top-oil thermal model for power transformers that consider weather factors
The aim of this work is to develop a top-oil thermal model based on the thermal-electrical analogy and heat transfer principles that captures the thermal influence of prevailing winds and solar radiation which can be generally applied to large power transformers. The key improvements of the proposed thermal model are calculating the heat transfer coefficient of the radiator on the air side using the Nusselt number of combined forced and natural convection, and including the solar radiation as an addition heat source. The proposed model is validated with the operational measurements of 3 transformers that are comprised of a 120/240-MVA unit and two 90/180-MVA units. The results are also compared with the predictions based on the IEEE-Annex G model. The proposed model is more accurate over windy and summer periods as expected.
Convection, Oil insulation, Oils, Power transformer, Solar radiation, Temperature distribution, Temperature measurement, Thermal resistance, top-oil temperature, transformer thermal model, winding temperature indicator
1-9
Doolgindachbaporn, Atip
61e63bb0-1269-406c-b29a-68d890e4a0c0
Callender, George
4189d79e-34c3-422c-a601-95b156c27e76
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Simonson, Edward
1fb30844-83ef-48c4-95bf-e9eaef5b89d5
Wilson, Gordon
dc9adb61-d122-46f2-8d05-b2b6489e7983
18 August 2021
Doolgindachbaporn, Atip
61e63bb0-1269-406c-b29a-68d890e4a0c0
Callender, George
4189d79e-34c3-422c-a601-95b156c27e76
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Simonson, Edward
1fb30844-83ef-48c4-95bf-e9eaef5b89d5
Wilson, Gordon
dc9adb61-d122-46f2-8d05-b2b6489e7983
Doolgindachbaporn, Atip, Callender, George, Lewin, Paul, Simonson, Edward and Wilson, Gordon
(2021)
A top-oil thermal model for power transformers that consider weather factors.
IEEE Transactions on Power Delivery, .
(doi:10.1109/TPWRD.2021.3105459).
Abstract
The aim of this work is to develop a top-oil thermal model based on the thermal-electrical analogy and heat transfer principles that captures the thermal influence of prevailing winds and solar radiation which can be generally applied to large power transformers. The key improvements of the proposed thermal model are calculating the heat transfer coefficient of the radiator on the air side using the Nusselt number of combined forced and natural convection, and including the solar radiation as an addition heat source. The proposed model is validated with the operational measurements of 3 transformers that are comprised of a 120/240-MVA unit and two 90/180-MVA units. The results are also compared with the predictions based on the IEEE-Annex G model. The proposed model is more accurate over windy and summer periods as expected.
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Accepted manuscript of A Top-Oil Thermal Model for Power Transformers that Considers Weather Factors
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Accepted/In Press date: 11 August 2021
Published date: 18 August 2021
Keywords:
Convection, Oil insulation, Oils, Power transformer, Solar radiation, Temperature distribution, Temperature measurement, Thermal resistance, top-oil temperature, transformer thermal model, winding temperature indicator
Identifiers
Local EPrints ID: 453011
URI: http://eprints.soton.ac.uk/id/eprint/453011
ISSN: 0885-8977
PURE UUID: 0f42a732-d98c-4c20-802d-79283355b2b3
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Date deposited: 07 Jan 2022 15:12
Last modified: 17 Mar 2024 02:37
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Contributors
Author:
Atip Doolgindachbaporn
Author:
George Callender
Author:
Paul Lewin
Author:
Edward Simonson
Author:
Gordon Wilson
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