Accurate Location of Transformer Hottest Spot by FEM and Thermal Models

International Journal of Computer Applications
© 2012 by IJCA Journal
Volume 37 - Number 6
Year of Publication: 2012

Dr.V.Rajini. Article: Accurate Location of Transformer hottest spot by FEM and Thermal models. International Journal of Computer Applications 37(6):36-41, January 2012. Full text available. BibTeX

	author = {Dr.V.Rajini},
	title = {Article: Accurate Location of Transformer hottest spot by FEM and Thermal models},
	journal = {International Journal of Computer Applications},
	year = {2012},
	volume = {37},
	number = {6},
	pages = {36-41},
	month = {January},
	note = {Full text available}


The formation of hotspots in the power transformers is one of the major threats for the life of the transformer. Therefore, the hot spot temperature value is an important parameter governing the life expectancy of a power transformer. This paper presents an approach to estimate and locate the hotspot accurately by considering the losses distributed across the transformer geometry. The distributed equivalent electrical circuit based on the thermal electrical analogy, is developed for a 50 kVA transformer. The results are also compared with the classical approach of estimating the hot spot temperature.


  • IEEE C57.91-1995 “IEEE Guide for Loading Mineral-Oil-Immersed Transformers”
  • IEEE C57.145 “Guide for the Definition of Thermal Duplicate Liquid-Immersed Distribution, Power and Regulating Transformer”
  • Dejan Susa, Matti Lehtonen, and Hasse Nordman, “Dynamic Thermal Modelling of Power Transformers”, IEEE Transactions on Power Delivery, Vol. 20, No. 1, January 2005.
  • Haritha V V S S, T R Rao, Amit Jain, M Ramamoorty, “Thermal Modeling of Electrical UtilityTransformer Using Finite Element Modeling Technique and Thermal-Electrical Analogy”, Presented in Third International Conference on Power Systems, Kharagpur, India , December 27-29, 2009.
  • Ires Iskender, Ali Mamizadeh, “ Non Linear Thermal Modeling of Indoor and Outdoor Oil-Immersed Power Transformers”,Journal of Electrical Engineering, Vol.60, N0.6, pp 321-327, 2009.
  • M Ghareh, L Sepahi, “ Thermal Modeling of Dry- Transformers and Estimating Temperature Rise”, World Academy of Science, Engineering and Technology, Vol. 45, pp 290- 292, 2008.
  • Traian Chiulan, Brandusa Pantelimon, “ Theoretical Study on a Thermal Model for Large Power Transformer Units”, International Journal of Engineering and Applied Sciences, Vol.4 ,No.4, pp 203- 206, 2008.
  • G. Swifft, om.S.Molinski, W.Lehn,” Fundamental approach to Transformer Modelling - Part I'' Theory and equivalent Circuit, IEEE transactions on Power Delivery, Vol.16, No.2, april 2001
  • Canadian Electrical Association Report 355T822, “Application of Fibre Optic Temperature Sensors to Establishing Transformer Overload Capabilities.,” 53 pages, March 1995.
  • Ankireddypalli S. Reddy, M. Vijaykumar,” Hottest Spot and Life Evaluation of Power Transformer using Finite Element”, Journal of Theoretical and Applied Information Technology,”pp-238-243, 2005
  • .Zoran Radokovic,Kurt Feser,”A new method for the calculation of the hotspot temperature in power transformers with ONAN cooling”, IEEE Trans on Power Delivery , Vol.18,No.4,pp1284-1292, 2003