The measured effects of under-voltage, over-voltage and unbalanced voltage on the efficiency and power factor of induction motors over wide ranges of load

Wallace, A.K.; Jouanne, A.R. von; Wiedenbrug, E.; Andrews, P.; Wohlgemuth, C.; Douglass, J. D.; Wainwright, G.

doi:10.1049/cp:19971079

Cited by 14 publications

(3 citation statements)

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“…Experiences in the electrical field as revealed that unequal sharing of single phase loads among the three supply phases, which may also frequently vary is one of the major causes of unbalance [5]. Machines are designed to operate at balanced rated voltage level, and according to [6] "all induction motors have some inherent phase unbalance due primarily to mass production tolerances" such that these four conditions often play out during motor operation, these are …”

Section: Voltage Unbalancementioning

confidence: 99%

The performance of a 3-Phase Induction Machine under Unbalance Voltage Regime

Adekitan¹,

Ogunjuyigbe²,

Ayodele³

et al. 2017

JESTR

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In industries, electric motors contribute a major percentage of electrical loads, and by implication, a major portion of the generated electrical energy is consumed by electric motors, and it is therefore vital to ensure that these motors operate with negligible energy loss. In operational environment, many factors can be responsible for a reduction in motor performance. One of the major factors is a regime of voltage unbalance that affects the motor, the load and supply network. Three phase induction motor studies can be carried out using methods such as real load test, finite element analysis, flux linkage-current relations etc. A new model based on phase frame analysis has been developed for easy computation of sequence components. This paper seeks to explore the performance of a 3-phase induction motor operating under unbalance voltage conditions using the phase frame analysis. The results of this study established that there are negative impacts of supply imbalance on the performance of three phase motor.

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Section: Voltage Unbalancementioning

confidence: 99%

The performance of a 3-Phase Induction Machine under Unbalance Voltage Regime

Adekitan¹,

Ogunjuyigbe²,

Ayodele³

et al. 2017

JESTR

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“…Fault analysis of a multiphase transmission line is essential for the successful deployment of a multiphase transmission line protection system design [9]. The study of an unbalanced three-phase system and the effect of an unbalanced supply on the three-phase induction machines is expansively reported in the literature [10][11][12][13][14][15]. However, the study of an unbalanced multiphase system and its impact on the performance of multiphase machines is rarely found in the literature [16,17].…”

Section: Introductionmentioning

confidence: 99%

Simulation and experimental study of power flow in a seven‐phase transformer under fault conditions

Husain¹,

Tabrez²,

Bakhsh

et al. 2022

IET Generation Trans & Dist

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Fault analysis is necessary to design a protection system and circuit breakers for a power system network. The multiphase system is a new technology so very little work is found for the fault analysis of a multiphase system contrary, unlike a three‐phase system. The faults in a seven‐phase system may be either symmetrical or non‐symmetrical. A non‐symmetrical fault requires studying the sequence components of a seven‐phase system using Fortescue transformation. In the paper, non‐symmetrical fault analysis of the seven‐phase system has been analysed. For this, a new definition of sequence components of an unbalanced seven‐phase system has been proposed in this paper. Then the proposed sequence components are applied to different faults studies at the input and output sides of a seven‐phase transformer. Further, the effect of the construction of a seven‐phase transformer, that is, core type and shell type on its output is studied. Moreover, the effect of open‐phase input is analysed using simulation and hardware results. From the analysis, it is found that in certain configurations of a seven‐phase transformer, the seven‐phase output is produced even though open‐phase fault is present at the input while in other configurations, seven‐phase is not produced in the case of open‐phase fault.

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“…Por otra parte, cabe señalar que la eficiencia de un motor eléctrico guarda estrecha vinculación con las condiciones de uso. En efecto, la eficiencia varía con el nivel de carga de un motor, con la temperatura de funcionamiento, con la calidad de las tensiones de alimentación (desbalance, bajo voltaje, distorsión armónica) [10][11][12][13], entre otras. Por consiguiente, su medición no resulta del todo sencilla.…”

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Efficiency Measurements in Induction Motors: Comparison of Standards

Verucchi

Ruschetti

Benger

2015

IEEE Latin Am. Trans.

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Recently, in an attempt to limit the growing energy demand in modern societies, it has been provided new guidelines in relation to the efficiency levels for electric motors. From them, different efficiency categories have been defined, which determine the limits for Standard Efficiency, High Efficiency, Premium Efficiency and Super Premium Efficiency motors. Most countries, consequently, have established restrictions to the use of low efficiency motors. Given that a little mistake in the process of the motor efficiency measurement could cause an incorrect classification, the standards to establish the electrical machines test procedures have been revised. Each standard, meanwhile, provide different test procedures. Each one allows calculating with more o less accuracy the motor efficiency, according to several available tools like dynamometer bench, torque sensor, windings temperature measurement, and others. This paper presents a comparison of some of the most commonly used standards for electrical motors efficiency measurement. The comparison is carried out using as reference the so-called direct method which consists in directly measuring the input and output power of the motor, with a strict control of the laboratory's ambient temperature and the engine power conditions. Comparisons allow conclusions regarding the probable errors in the application of each standard.

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The measured effects of under-voltage, over-voltage and unbalanced voltage on the efficiency and power factor of induction motors over wide ranges of load

Cited by 14 publications

References 0 publications

The performance of a 3-Phase Induction Machine under Unbalance Voltage Regime

The performance of a 3-Phase Induction Machine under Unbalance Voltage Regime

Simulation and experimental study of power flow in a seven‐phase transformer under fault conditions

Efficiency Measurements in Induction Motors: Comparison of Standards

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