Abstract
The causes of faults of induction motors are largely categorized into bearing fault, which causes a mechanical fault, and stator fault and rotor fault, which cause an electrical fault. A stator fault among these faults, which causes an electrical fault, 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. This paper explained the effects of a negative sequence on phase angle change by analyzing the effects of the existing negative sequence on the d-q transform of Park’s vector approach. 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.
Highlights
Most of the faults of induction motors are caused by bearing fault (44%); wrong winding or stator fault due to a stator winding short circuit fault or a stator winding open circuit fault (26%); and fault of the bar of the rotor (8%)
The causes of induction motors are largely categorized into mechanical faults and electrical faults bearing faults causing mechanical faults; and stator faults and rotor faults causing electrical ones
As for stator fault, it can be seen that linear separation is impossible at the ideal threshold value that the paper suggested when a 2-turn short fault has occurred; but linear separation from steady state is possible at the value when a 4-turn short fault has occurred
Summary
Most of the faults of induction motors are caused by bearing fault (44%); wrong winding or stator fault due to a stator winding short circuit fault or a stator winding open circuit fault (26%); and fault of the bar of the rotor (8%). The occurrence of a turn to turn short causes a large circulating current to occur in the faulty loop, and the heat in the winding, which is proportional to the square of the stator current, plays a role in accelerating the occurrence of a more serious fault, such as phase-tophase short fault and a phase-earth fault, which cause a serious damage to the winding and core of the stator This is the time when early diagnosis is desperately needed, as detecting a turn to turn short in the early stage can prevent a sequential damage to the motor and considerably reduce economic loss by minimizing the outage time of the motor, the number of additional workers, and the cost of repair. This paper suggested a new fault diagnosis method in online using the duty ratio of half-period frequency according to phase angle change, with the consideration of the effects of negative sequence components on PV's d-q transform
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