Estudio de presencia de humedad en el aceite dieléctrico del autotransformador de potencia utilizado en transmisión para estimar la vida útil remanente

Abstract

This document is based on the calculation to estimate the remaining useful life of the three-phase power autotransformer of the Mulaló substation with a capacity of 66.7 MVA, whose transformation ratio is 138 kV/ 69 kV /13.8 kV, whose operation and maintenance is in charge of the Corporación Eléctrica del Ecuador in its Transelectric Business Unit, through the management of the Northeastern Operative Zone. To the above mentioned autotransformer, a study is made to determine the remaining life in years, specifically from the concentration of furans analyzed to the dielectric oil and by means of the results thrown from the previous laboratory a sample of oil extracted from the ATQ, in which the results will be considered and a follow-up and statistical analysis will be made considering to observe the behavior of the degradation of the autotransformer paper of the Mulaló substation since it is exposed to the high temperatures and oxidation, ratifying that these compounds are determined by means of laboratory tests. The prediction of the remaining life time of the autotransformer is directly associated with the condition of the insulating paper, in conclusion, the life of the autotransformer depends on the life of the insulating paper. According to the laboratory results, carried out on the ATQ autotransformer of Mulaló substation, it will be determined that, despite being in operation for many years, this equipment can still increase its useful life, with good maintenance and operating conditions at adequate temperatures.