Abstract

NUNEZ MATA, Óscar; GOMEZ-RAMIREZ, Gustavo Adolfo; ACUNA ROJAS, Fauricio  and  GONZALEZ SOLIS, César. Metodología para Evaluar la Condición de Transformadores Eléctricos de Potencia Basada en un Índice de Salud. Ingeniería [online]. 2023, vol.33, n.1, pp.48-65. ISSN 2215-2652.  http://dx.doi.org/10.15517/ri.v33il.50613.

The development of condition monitoring systems that follow the evolution of power transformer aging is essential for safe and reliable operation of electrical systems. Having condition monitoring tools has become a priority for power companies, this being a complex task, since the operation of the transformer combines different requests. Some authors propose the use of health indices, which collect, in a single parameter, the condition of the equipment. To obtain the index, test results are used to verify the condition of the parts. This will be the basis for evaluating global health and facilitating the identification of failure modes. This work proposes a novel tool that evaluates power transformers based on a health index, based on a sum of weighted scores. This approach of separating the transformer into two zones seeks to facilitate its diagnosis and evaluation. It was possible to determine with expert criteria the importance of each test, supported by international regulations. The results obtained in the case studies showed a good performance of the health index when evaluating five power transformers. The value of the health index calculated for each transformer coincided with the results of the evaluations carried out after the tests were executed. This indicates that moving towards the use of a health index to assess the transformer can improve the monitoring of the condition of this equipment.

Keywords : Chemical analysis; failure analysis; insulation testing; power systems; power transformer.

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