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Cable conductors are essential elements for the electric power system, in particular for the power distribution system. In substations, due to the amount of equipment and subsystems, many energized lines are sectioned and connected on many points, presenting a natural temperature increase in these regions due to heat generation by Joule effect. The temperature difference between the region of electrical connection and cables generates a portion of heat transfer by conduction, which can be modeled from an ordinary differential equation of second order, inhomogeneous and nonlinear. This work aims to confront the numerical and analytical solutions of the problem, assess the adequacy of the simplifications assumed for the physical phenomenon and perform experimental validation through testing current. The results show a good approximation between model and experiment, and from the point of view of monitoring conductor cables, this modeling is useful in identifying the distance from the point of heating that is necessary for the measurement of temperature in the cable is not influenced by the effects of axial heat conduction; contributing to an increase in reliability of thermal records and thus the diagnosis of the component.

MODELAGEM MATEMÁTICA DO EFEITO DA CONDUÇÃO TÉRMICA NO PROCESSO DE AQUECIMENTO DE CABOS CONDUTORES