Utilizando a modelagem matemática na identificação da temperatura interna no topo do óleo do transformador monofásico de 15 KVA

Abstract

The eletric power distribution is composed of several equipment of different purposes. Among these equipment stands out the transformer, used to enable the supply of energy at the points of consumption in a safe and with quality. This equipment has the function of transforming the energy from one level of voltage to another, making its transport feasible. However, when these devices are in operation in the areas of consumption, they are not monitored for the internal temperature rises that may be occurring and compromising their useful life. The transformers work for a long time without any indication of magnitudes such as: temperature, gas formation and quality of the insulating oil. According to NBR 5380 (1993) the temperature values can not exceed 50ºC, because it compromises the characteristics of the insulating oil and its cooling capacity, leaving the equipment vulnerable to burning. Often when this equipment presents a problem, the distributor performs the replacement without identifying the cause of the failure. In this context that the present work indicates a mathematical function capable of identifying the internal temperature at the top of the transformer oil. This mathematical modeling was developed after several tests made on the equipment and made possible a more precise diagnosis as to its operation, since at the top of the oil the high temperature values to which it is submitted are concentrated