Comparative Study of Two Thermal Aging Estimating Methods for Power Transformers

Ricardo David Medina, Andres Arturo Romero, Enrique Esteban Mombello, Giuseppe Ratta

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


In this paper a comparison between two methods for the calculation of the hot spot temperature of a power transformer is presented. The first method is proposed by C57.91 IEEE Standard which is based on daily averages and exponential equations; on the other hand, the second method is based in differential equations and hourly measurements. To compare these methods, the ageing of a currently operating power transformer has been estimated. A comparison of the results of degradation using actual values and a hypothetical overload were performed. A brief description of each method, aging results, time calculation and analysis of the results is presented.

Original languageEnglish
Article number7387233
Pages (from-to)3287-3293
Number of pages7
JournalIeee Latin America Transactions
Issue number10
StatePublished - Oct 2015


  • ageing
  • end of life assessment
  • paper ageing
  • power transformer
  • solid insulation
  • thermal ageing
  • thermal degradation


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