Title :
Thermal model for power transformers dynamic loading
Author :
Elmoudi, A. ; Lehtonen, M. ; Nordman, Hasse
Author_Institution :
Power Syst. & HV Eng., Helsinki Univ. of Technol., Espoo
Abstract :
This paper presents a thermal model of a power transformer in the form of simple equivalent circuit. The model is established to calculate the top oil and hot spot temperatures. The model parameters are obtained from manufacturer test data and an electromagnetic analysis using finite element method (FEM). The model results are compared with measured data obtained from 250 MVA, 230plusmn8times1.5%/118/21 kV ONAF transformer equipped with fiber optic probes and tested according to a load cycle comprising a short time load up to 2.1 pu. The results are additionally compared with the conventional equations of the IEEE clause 7
Keywords :
IEEE standards; equivalent circuits; finite element analysis; power transformer testing; thermal analysis; IEEE clause 7; ONAF power transformer testing; dynamic loading; electromagnetic analysis; equivalent circuit; fiber optic probe; finite element method; hot spot temperature; thermal model; Circuit testing; Electromagnetic analysis; Electromagnetic modeling; Equivalent circuits; Finite element methods; Petroleum; Power transformers; Temperature; Thermal loading; Virtual manufacturing;
Conference_Titel :
Electrical Insulation, 2006. Conference Record of the 2006 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
Print_ISBN :
1-4244-0333-2
DOI :
10.1109/ELINSL.2006.1665295
