Rediscovering the Derating Mechanisms for Three-Phase Induction Motors Operating under Supply Voltage Unbalance

Sudasinghe, Pathum; Perera, Sarath; Commins, Philip; Moscrop, Jeffrey W; Jayatunga, Upuli; Wadduwage, Prasad

doi:10.1109/ichqp46026.2020.9177885

Cited by 2 publications

(3 citation statements)

References 30 publications

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“…The practical tests show a noticeable change in motor vibration and sound. The recorded result of motor vibration is shown in Figure 8 when it operated under healthy operation [0-4] seconds, and under single-phasing fault [4][5][6][7][8][9][10] seconds. Therefore, a fault detection hypothesis can be applied to detect the occurrence of a fault if the vibration signal exceeds the threshold value.…”

Section: Theoretical Calculation and Simulation Resultsmentioning

confidence: 99%

“…jXm+ Rr s+jXr ⁄ (7) where i = 1, 2 for positive and negative sequences, respectively. The stator sequence currents are as follows:…”

Section: Rr S+jxr ⁄mentioning

confidence: 99%

“…A review of the literature reveals various analyses and concerns about electrical faults in induction motors (open-phase, voltage unbalance, overvoltage, and phase shortcircuit). The work in [3][4][5][6][7] investigated the effects of voltage imbalance on the torque and current of an induction motor. The research in [8] presented an experimental study on reducing the power rating of an induction motor under different voltage unbalanced conditions and comparing it to the National Electrical Manufacturers Association (NEMA) standard.…”

Section: Introductionmentioning

confidence: 99%

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Practical Test on the Operation of the Three-Phase Induction Motor under Single-Phasing Fault

Abdo,

Siam,

Abdou

et al. 2024

Applied Sciences

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Single-phasing is a common problem in the three-phase electrical grid. Despite the fact that the fault occurs in one phasing, the three-phase load is affected, and therefore the load is typically turned off. The three-phase induction motor is the most commonly used in the industry; therefore, this research investigates the behavior of the three-phase induction motor under a single-phasing fault. The main aim of this paper is to answer the question, should the three-phase induction motor be turned off under a single-phasing fault? The problem is investigated theoretically and compared with practical tests to explore the parameters of the induction motor (current, stator temperature, and vibration) that are affected under healthy and single-phasing fault conditions. A practical test machine is built to test the motor behavior under single-phasing faults, where the practical experiment results are compared to those of the simulations. Despite the common recommendation under single-phasing fault is to turn off the induction motors, the preliminary results of this study show that turning off an induction motor under single-phasing can be avoided under certain operating conditions with a simple protection scheme, which is useful in some practical situations.

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Section: Theoretical Calculation and Simulation Resultsmentioning

confidence: 99%

“…jXm+ Rr s+jXr ⁄ (7) where i = 1, 2 for positive and negative sequences, respectively. The stator sequence currents are as follows:…”

Section: Rr S+jxr ⁄mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Practical Test on the Operation of the Three-Phase Induction Motor under Single-Phasing Fault

Abdo,

Siam,

Abdou

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

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Derating factor determination of the three‐phase induction motor under unbalanced voltage using pumping system

Majeed,

Seifossadat,

Saniei

et al. 2024

IET Electric Power Appl

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A novel method is presented for determining the derating factors of a three‐phase induction motor under the condition of the unbalanced supply voltages. In this method, a mechanical system is used which consist of the a centrifugal pump, two valves, a DC motor, which are connected to the shaft of the three‐phase induction motor. A sliding mode control system is used for position control of the DC motor for adjusting the valve angle for derating the induction motor. The authors present the results of an experiment in which a three‐phase induction motor was subjected to various unbalanced voltage conditions. The results of simulations were used to look into what happened when there were different levels of imbalanced voltage. This was done to determine how these situations changed an induction motor's speed, torque, and efficiency. For this system, the stator current would be greater than the rated current if there was an imbalance in the supply voltage. Therefore, to reduce the amount of power that the three‐phase induction motor can produce, the control system uses a DC motor to reduce the angle of one of the two valves. This decreasing angle continues until the root mean square value of the stator current returns to the rated current. At this point, the derating factor may be calculated by dividing the output power of the three‐phase induction motor in the unbalanced condition by the output power when there are ideal sinusoidal. The MATLAB SIMULINK environment is utilised to perform simulations of the proposed system.

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Rediscovering the Derating Mechanisms for Three-Phase Induction Motors Operating under Supply Voltage Unbalance

Cited by 2 publications

References 30 publications

Practical Test on the Operation of the Three-Phase Induction Motor under Single-Phasing Fault

Practical Test on the Operation of the Three-Phase Induction Motor under Single-Phasing Fault

Derating factor determination of the three‐phase induction motor under unbalanced voltage using pumping system

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