Dynamic thermal modeling of top oil temperature rise for power transformers

• Autorzy: Iskender I. , Mamizadeh A.
• Konferencja: Computer Applications in Electrical Engineering 2009 [Poznan, 20-22 April, 2009]
• Języki publikacji: EN

Abstrakty

EN

Transformer life has a considerable economic impact on the operation of an electrical network. The most important parameter in transformers life expectancy is the insulation temperature value. The aim of this paper is to present a new and more accurate top-oil thermal model based on heat transfer theory, application of the lumped capacitance method, the thermal-electrical analogy and a new definition of nonlinear thermal resistances of oil immersed transformers. The model presented in this paper takes into account oil viscosity changes and loss variation with temperature. The changes in transformer time constants due to changes in he oil viscosity are also accounted for in the thermal model. The models are validated using experimental results, which have been obtained from a series of temperature rise tests performed on a range of oil immersed distribution transformers. The experimental results verify the model proposed in this study for oil immersed transformers.

Słowa kluczowe

EN

thermal model; top-oil temperature rise; thermal resistance; transformer

PL

model termiczny; przyrost temperatury; opór cieplny; transformator

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Poznan University of Technology Academic Journals. Electrical Engineering
• Rocznik: 2009
• Tom: No 60
• Strony: 103--114
• Opis fizyczny: Bibliogr. 10 poz.

Twórcy

autor

Iskender I.

autor

Mamizadeh A.

• Gazi University

Bibliografia

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• [5] Susa D., Lehtonen M., and Nordman H., “Dynamic thermal modeling of power transformers,” IEEE Trans. Power Del., vol. 20, no. 1, pp. 197-204, Jan. 2005.
• [6] Weigen C., Chong P., Yuxin Y., “Power transformer top-oil temperature model based on thermal-electric analogy theory", European Transactions on Electrical Power , Euro. Trans. Electr. Power (2007) Published online in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/etep.217.
• [7] IEC 60076-2 Power transformer part 2 temperature rise, IEC standard 60076-2.
• [8] Jayaram S., Wu H., “Heat transfer of transformer oil in Plexiglas pipe and paper-pressboard annular duct models”, Conference Record of the 1994 IEEE International Symposium on Electrical Insulation, 1994, Pittsburgh, PA USA, June 5-8, 19w.
• [9] General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers, IEEE Standard std. C57.12.00.2006, Feb. 28 2007.
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