Estudio Comparativo de dos Métodos para la Estimación del Envejecimiento Térmico del Transformador de Potencia (Comparative Study of Two Thermal Aging Estimating Methods for Power Transformers)

Ricardo David Medina (, Andrés Arturo Romero (, Enrique Esteban Mombello (, Giuseppe Rattá (

1Universidad Politécnica Salesiana
2Instituto de Energía Eléctrica, Universidad Nacional de San Juan (IEE-UNSJ) - CONICET,

This paper appears in: Revista IEEE América Latina

Publication Date: Oct. 2015
Volume: 13,   Issue: 10 
ISSN: 1548-0992

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.

Index Terms:
ageing, end of life assessment, paper ageing, power transformer, solid insulation, thermal degradation, thermal ageing,   

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