The performance of a 3-Phase Induction Machine under Unbalance Voltage Regime (original) (raw)
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COMPARATIVE ANALYSIS OF THREE-PHASE INDUCTION MOTOR FED FROM BALANCED AND UNBALANCED POWER SUPPLY
TJPRC, 2014
In a three-phase system, unbalance voltage introduce when the magnitudes of phase voltages and the phase angles differ from the balanced conditions, or both. Unbalanced voltage factor have own importance when we are studying the impact of unbalance voltage on the behavior of three-phase induction machines. Problems like over & under voltages, oscillations, high losses and disturbance in phase angle are the key problem of unbalance voltage factor. Searching these abnormal conditions in the machine have major importance in the electrical machine. In this paper the effect of the balance and unbalanced voltages on the motor performance, have been investigated just like rotor and stator current, speed, electromagnetic torque graphs.
The impact of supply phase shift on the three phase induction motor operation
Engineering Review, 2019
The performance of a three-phase induction motor operating under supply unbalance conditions has been the focus of many research works using various methods. Most of the studies have focused majorly on voltage magnitude unbalance without due analysis to determine the effect of deviations in the supply phase angle from the 120 phase to phase displacement. This research investigates the significance of supply phase shift on the performance of a three-phase induction motor by applying a novel phase shift unbalance definition to the zero, negative and positive sequence components model of the motor. The test results reveal that when both phase angle shift and voltage magnitude unbalance occur simultaneously during motor operation the effect of the phase shift dominates over the effects of the voltage magnitude unbalance. This study shows that phase angle unbalance has a severe consequence on three phase motor performance.
Performance Analysis of Three Phase Induction Motor Under Balance & Unbalance Voltage Condition
2018
A three phase induction motor are very commonly employed in power system because of their feature. It can perform the best when operated using a balance three phase supply of the correct frequency .A three phase Induction motor are very commonly employed in power system because of their features like good self starting, capability ,offers users ,simple ,rugged ,construction, easy maintained ,low cost and reliability .Due to extensive use of induction motor in Industry ,motor can be exposed to different hostile environment ,missoperation ,manufacturing defects etc .One of the most common type of external fault is abnormal supply condition such as loss of supply voltage ,unbalance supply, over voltage ,under voltage. This paper ,present the negative effect of unbalance voltage on performance ,parameter of 5 hp induction motor such as current ,efficiency, temperature rise ,speed, torque, and comparison between different voltage condition.
Electronics and Electrical Engineering, 2011
Induction motors are known to affect the electrical power system in terms of harmonics. Induction motors fed by unbalanced power systems produce additional current harmonics. These harmonics cause additional power losses in the machine. The method of symmetrical components is often used in this kind of unbalanced operation analysis. In this study, the performance of a three phase induction motor supplied by unbalanced power system due to the various causes has been examined using both experimental method and Matlab/Simulink model. Ill. 11, bibl. 6, tabl. 6 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.109.3.167
The Performance of a Three-Phase Induction Motor under and over Unbalance Voltage
Tikrit Journal of Engineering Sciences, 2021
Voltage unbalance is an adverse global phenomenon impacting three-phase induction motor output. Three-phase source voltage may become imbalanced in a variety of respects, while a balanced system preserves stable voltage magnitude and angles in three phases, but a completely balanced state is difficult to get. Imbalanced cases may differ in multiple ranges which may practically affect the motor. So, this work is an effort to analyze the operations with appropriate propositions. The output of a three-phase induction motor working with an imbalanced supply grid, MATLAB/SIMULINK is further used for simulation purposes and programming based on the asymmetrical component approach is adopted. A new design for system rerating is being proposed. As a case study, a 10 HP three-phase induction motor was used. The findings of the study show that to determine the output of the induction motor, positive voltage series must be respected under the voltage unbalance factor (VUF) or proportion voltag...
Data in Brief, 2019
Three phase induction motors (TPIM) are extensively used for various applications in the industry for driving cranes, hoists, lifts, rolling mills, cooling fans, textile operations, and so forth. TPIM are designed to operate on balanced three phase power supply, but sometimes three phase supply line voltages to which the TPIM is connected may be unbalanced. In this data article, the operational data of a TPIM operating under changing voltage scenarios is profiled to determine the variations in the magnitude of the operational parameters of the motor. The magnitude of each of the line voltages was separately varied from the balanced state (0% unbalance) until 5% voltage unbalance condition was achieved, in line with the recommendations and guidelines of the National Electrical Manufactures Association. The motor parameters; both mechanical and electrical, at various slip values were collected in six sets for the 0%, 1%, 2%, 3%, 4%, and 5% unbalance voltage conditions. Frequency distributions and statistical analysis were carried out to identify the data pattern and data variation trends among the parameters in the dataset.
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/performance-investigation-of-three-phase-induction-motors-rotor-under-unbalanced-positive-sequence-voltage-through-simulations https://www.ijert.org/research/performance-investigation-of-three-phase-induction-motors-rotor-under-unbalanced-positive-sequence-voltage-through-simulations-IJERTV2IS90681.pdf The greatest potential for energy savings is in electric motor applications and induction motors constitute over 60% of such usage. A significant amount of investment on low losses motor materials and drives could be made in order to achieve energy efficiency, but many a times it has been found that performance variations of electric motors are mainly due to external factors, in particular, the quality of the incoming supply. Therefore, when it comes to identifying energy efficiency opportunities, it is essential to study the influence of voltage variations on electric motors. This work investigated the impact of positive sequence rated voltage, under voltage and over voltage unbalance on induction motor's rotor operational performance using the International Electrotechnical Commission's (IEC) definition of voltage unbalance. MATLAB ® Simulink was used to build a model for the performance analysis of a 2h.p induction motor and operated under balance and unbalance voltages at no load and various loaded condition using IEC's definition of voltage unbalance. The results obtained indicated gross rotor inefficiency when the motor operated under various unbalanced conditions of rated voltage, under voltage and over voltage. The worst adverse effect of unbalance was most severe at under voltage conditions; drastic load reduction did not produce good motor performance even with a low Voltage Unbalance Factor (VUF). At over voltage unbalance however, motor's rotor indicated fair performance at VUF of 2-4% with a load reduction of 50%. At rated voltage unbalance with VUF of 2-4%, good performance was observed on load reduction of 50%. Above VUF of 4% for all types of unbalance, motor's rotor operation became grossly inefficient and load reduction did not improve the operational performance of the induction motor's rotor.
Analysis of three-phase induction machine operation under two-phase supply
2002 IEEE International Conference on Industrial Technology, 2002. IEEE ICIT '02., 2002
The paper concerns with analysis of phenomena in an induction machine that operates with one stator phase open and with stator winding neutral connected with the centre of bank of dc-link capacitors after the converter reconfiguration due to a failure in the supplying inverter. This reconfiguration allows the drive to continue in operation and prevents the driven equipment from damage. In this case a zero-sequence component of stator currents can arise. It relates to the third space harmonic of the current layer along the air gap. The method of symmetrical components is employed to describe the system, which enables higher space harmonics to be taken into account. It is shown that the third harmonics of the current layer and of the magnetic flux in the yoke may have significant effect on the properties and behavior of the induction machine under these circumstances. The main objective of this work is to derive mathematical description and develop a numerical model of the system under investigation. The correct function of the developed model has been verified by comparison of the results obtained in numerical simulation with the results obtained in experiments.
IEEE Transactions on Energy Conversion, 2000
This paper evaluates the influence of the unbalance factors in calculating total copper losses, efficiency, power factor, input power, output torque, peak currents, and derating factor of the motor operating under unbalanced voltage system. The complete definition for the voltage unbalance is using complex voltageunbalance factor that consists of its magnitude and angle. A coefficient to determine either under-or overunbalance conditions is inserted. The analysis of the motor is performed using the method of symmetrical component, and MATLAB software is used to investigate the performance of the induction motor. The simulation results show that the International Electrotechnical Commission definition of the voltage unbalance combined with the coefficient of unbalance condition can be applied to evaluate total copper losses, input power, power factor, and total output torque precisely. However, the phase angle of the unbalance factor must be included for accurate prediction of peak current and peak copper losses of the phase windings and derating factor of the motor.