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 (rmedinav@ups.edu.ec)1, Andrés Arturo Romero (aromero@iee.unsj.edu.ar)2, Enrique Esteban Mombello (mombello@iee.unsj.edu.ar)2, Giuseppe Rattá (ratta@iee.unsj.edu.ar)2


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


Abstract:
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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