DocumentCode
862671
Title
A simple method for calculating winding temperature gradient in power transformers
Author
Ryder, Simon A.
Author_Institution
Alstom Transformateurs de Puissance, France
Volume
17
Issue
4
fYear
2002
fDate
10/1/2002 12:00:00 AM
Firstpage
977
Lastpage
982
Abstract
This paper presents a new method for calculating winding temperature gradient in large power transformers. A general formulation of the problem is made using the electrical analogy. An expression for the thermal resistance of the solid insulation is found using analytical methods. Expressions for the thermal resistance of the oil boundary layer for natural and directed oil flow are then found through correlation of test results from actual transformers. A comparison of the results of the new method and previous methods is presented. The new method is found to be a significant improvement.
Keywords
power transformers; temperature distribution; thermal analysis; transformer windings; directed oil flow; natural oil flow; oil boundary layer; power transformer windings; solid insulation thermal resistance; temperature gradient calculation method; Conductors; Cooling; Kelvin; Oil insulation; Petroleum; Power transformers; Surface resistance; Temperature; Thermal conductivity; Thermal resistance;
fLanguage
English
Journal_Title
Power Delivery, IEEE Transactions on
Publisher
ieee
ISSN
0885-8977
Type
jour
DOI
10.1109/TPWRD.2002.803701
Filename
1046872
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