Protección de la máquina de inducción mediante su modelo térmico

Abstract

In this project, a thermal model of a three-phase wound rotor induction motor has been developed, and its parameters have been determined through thermal and electrical tests in the laboratory. The objective of developing this model is to determine the thermal limits of the machine using the voltages and currents measured at the converter terminals, in order to enable its protection. Based on the thermal test performed in direct current (DC) and alternating current (AC), results of the temperatures measured in the stator and rotor windings with respect to the ambient temperature are obtained. The model considers the dynamic heating regime and the steady-state solution. The development of a second-order thermal model required the power losses and the parameters of the induction machine’s thermal model. The model results accurately predict the temperature levels that the stator and rotor windings will reach under different operating conditions.