Detecção de falhas em motores de indução trifásico utilizando o método off-line avaliando a resistência estatórica

Abstract

Short circuits in the stator windings are considered as one of the major failures that occur in a three-phase induction motor (MIT), influenced by the quality of the insulation between the windings and between the phases of the coils inside the motor. There are several factors that affect the life of the insulation of the stator windings, which can be highlighted: thermal overload, dielectric efforts, partial discharges, transient phenomena in power supply, mechanical stress, environmental agents, besides himself gradual aging of insulation. One way to be aware about the quality of winding is through periodic monitoring to ensure that the short-circuit levels, which affect engine performance, do not exceed the tolerable levels, thus ensuring that the failure in the winding does not become catastrophic for the engine. In addition, fault detection in its initial state can avoid further damage to the engine, which affect the processes in which it is being used, avoiding greater losses due to lost production time and avoids high costs of maintenance and repair. Note, therefore, the importance of developing methods to detect and classify the short levels in the windings, reliably and effectively in order to ensure satisfactory operation and maximum performance of induction motors. Based on this information, this project is to develop an off-line method to detect and classify levels in a short induction motor, by analyzing the stator resistance, taking into account the influence of temperature on the resistance.