A New Algorithm for Analyzing Method of Electrical Faults of Three-Phase Induction Motors Using Duty Ratios of Half-Period Frequencies According to Phase Angle Changes

Abstract

A stator fault of induction motor occurs due to the breakdown of insulation, meaning the stator is directly connected with the power supply, and the direct connection is a direct cause of a major accident. For this reason, many studies are being performed to detect the faults. As for the existing studies on stator fault detection, they are being performed considering the possibility of stator fault only, excluding the possibility of rotor fault. It is necessary to identify and detect whether a stator (or rotor) fault is the cause of the electrical fault. This paper suggested a new algorithm that identifies the causes of stator faults with the use of the change in the duty ratio of the half-period frequency of the frequency when a phase angle change occurs at that moment. Also, by applying the algorithm to the fault of the rotor, it was also possible to grasp their fault state and to identify accurately whether a stator (or rotor) fault is the cause of an electrical fault.