A simplified transformer thermal model based on thermal-electric analogy

Author

Tang, W.H. ; Wu, Q.H. ; Richardson, Z.J.

Author_Institution

Dept. of Electr. Eng. & Electron., Univ. of Liverpool, UK

Volume

19

Issue

3

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

1112

Lastpage

1119

Abstract

This paper presents a further simplified thermal-electric analogous thermal model of an oil-immersed power transformer. The method is rooted on the principles of heat exchange and electric circuit laws. A set of differential equations is derived to calculate both the transient-state temperatures and the stationary-state equilibria in the main parts of a transformer. For the problem of thermal parameters identification, a genetic algorithm is employed to search global solutions for thermal parameters with onsite measurements. The validation of the simplified model and calculations of hot-spot temperatures are discussed in detail.

Keywords

differential equations; genetic algorithms; heat transfer; power transformers; thermal analysis; transformer oil; differential equations; electric circuit laws; genetic algorithm; heat exchange; hot-spot temperatures; oil-immersed power transformer; stationary-state equilibria; thermal parameter identification; thermal-electric analogy; transformer thermal model; transient-state temperatures; Artificial intelligence; Capacitance; Circuits; Differential equations; Genetic algorithms; Oil insulation; Petroleum; Power transformers; Temperature; Thermal conductivity;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2003.822968

Filename

1308335