E. G. teNyenhuis, R. S. Girgis, G. F. Mechler and G. Zhou, “Calculation of Core Hot-Spot Temperature in Power and Distribution Transformers,” IEEE Transactions on Power Delivery, Vol. 17, No. 7, 2002, pp. 991-995. doi:10.1109/TPWRD.2002.803703

has been cited by the following article:

• TITLE: Extensions to the Finite Element Technique for the Magneto-Thermal Analysis of Aged Oil Cooled-Insulated Power Transformers

  AUTHORS: Jehan Shazly, Amr A. Adly

  KEYWORDS: Oil Insulated-Cooled Power Transformer; Finite Element Method; Electromagnetic Field Analysis; Thermal Analysis

  JOURNAL NAME: Journal of Electromagnetic Analysis and Applications, Vol.4 No.4, April 24, 2012

  ABSTRACT: It is well known that the hot spot temperature represents the most critical parameter identifying the power rating of a transformer. This paper investigates the effect of the degradation of core magnetic properties on temperature variation of aged oil-cooled transformers. Within this work, 2D accurate assessment of time average flux density distribution in an oil insulated-cooled 25 MVA transformer has been computed using finite-element analysis taking into account ageing and stress-induced non-uniform core permeability values. Knowing the core material specific loss and winding details, local core and winding losses are converted into heat. Based upon the ambient temperature outside the transformer tank and thermal heat transfer related factors, the detailed thermal modeling and analysis have then been carried out to determine temperature distribution everywhere. Analytical details and simulation results demonstrating effects of core magnetic properties degradation on hot spot temperatures of the transformer’s components are given in the paper.