Heating of Induction Motors on Unbalanced Voltages

Gafford, B. N.; Duesterhoeft, W. C.; Mosher, C. C.

doi:10.1109/aieepas.1959.4500314

Cited by 85 publications

(23 citation statements)

References 2 publications

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“…This gives the post-connection VU emission at the POE with its constituent parts identifying different sources of unbalance as given by (2).…”

Section: Vu Emission Assessment Of Induction Motorsmentioning

confidence: 99%

“…Changes may have been made to this work since it was submitted for publication. caused by extra heating associated with unbalanced currents are documented in [2]. Derating of induction motors [3] [4], increase of losses and the negative effects on insulation life [5] and performance of protective relays used in induction motors [6] are further areas investigated under unbalanced supply voltages.…”

Section: Introductionmentioning

confidence: 99%

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Impact of mains connected three-phase induction motor loading levels on network voltage unbalance attenuation

Jayatunga¹,

Perera²,

Ciufo³

2012

2012 IEEE International Conference on Power System Technology (POWERCON)

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Voltage unbalance (VU) in power systems should be managed in a systematic manner in order to minimise its adverse effects on both customer equipment and supply utilities. It is a well known fact that three-phase induction motor performance can be significantly affected in the presence of supply voltage unbalance. It is also known that three-phase induction motors can help to reduce pre-existing network voltage unbalance levels. Recently undertaken research aligned with IEC/TR 61000-3-13:2008 Technical Report on voltage unbalance management (emission allocation and emission assessment) have quantified the contribution made by induction motors to the net voltage unbalance at a point of connection. It is perceived that loading level of three-phase induction motors will have an influence on this contribution. Hence, this study focuses on a sensitivity analysis of induction motor loading level on the voltage unbalance emission contribution to the point of connection. Simulation work undertaken indicates that increased loading levels on induction motors tend to exacerbate negative sequence voltage unbalance factor (VUF) at the point of connection in comparison to lightly loaded induction motors. Abstract-Voltage unbalance (VU) in power systems should be managed in a systematic manner in order to minimise its adverse effects on both customer equipment and supply utilities. It is a well known fact that three-phase induction motor performance can be significantly affected in the presence of supply voltage unbalance. It is also known that three-phase induction motors can help to reduce pre-existing network voltage unbalance levels. Recently undertaken research aligned with IEC/TR 61000-3-13:2008 Technical Report on voltage unbalance management (emission allocation and emission assessment) have quantified the contribution made by induction motors to the net voltage unbalance at a point of connection. It is perceived that loading level of three-phase induction motors will have an influence on this contribution. Hence, this study focuses on a sensitivity analysis of induction motor loading level on the voltage unbalance emission contribution to the point of connection. Simulation work undertaken indicates that increased loading levels on induction motors tend to exacerbate negative sequence voltage unbalance factor (VUF) at the point of connection in comparison to lightly loaded induction motors.

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“…This gives the post-connection VU emission at the POE with its constituent parts identifying different sources of unbalance as given by (2).…”

Section: Vu Emission Assessment Of Induction Motorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of mains connected three-phase induction motor loading levels on network voltage unbalance attenuation

Jayatunga¹,

Perera²,

Ciufo³

2012

2012 IEEE International Conference on Power System Technology (POWERCON)

View full text Add to dashboard Cite

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“…A lot of researches have been reported in the literatures regarding adverse effect of voltage unbalance on IM. The effects of voltage unbalance on winding temperature, efficiency, power factor, total loss, derating factor of IM etc are well documented in [5][6][7][8][9][10][11]. In [5], eight conditions of voltage unbalances are considered and effects of unbalance on the performance of IM are analyzed with same voltage unbalance factor (VUF).…”

Section: Introductionmentioning

confidence: 99%

“…In [6], discussion about the efficiency of IM under unbalance condition has been presented while [7], discusses about the derating factor, winding temperature and thermal loss of life on fed IM operating with over and under voltage along with differences in definition of voltage unbalance. The effect of voltage unbalance winding temperature of IM has been discussed in [8][9][10]. To analyze the effect of voltage unbalance in phase frame, a new method has been developed in [11].…”

Section: Introductionmentioning

confidence: 99%

“…This method reduces the complexity arises in transforming phase to sequence component and vice versa and also investigates the increases in losses under unbalance supply voltage condition. In all of these aforementioned studies [5][6][7][8][9][10][11], either the percent voltage unbalance (PVU) defined by NEMA [12], or VUF defined by IEC [13] [15], special emphasis is placed on the effect of the angle of CVUF on the performance of IM and most favourable and worst case for derating factor and maximum allowable slips are discussed whereas in [16] normalized negative sequence component is used in substitution to VUF to judge the effect of unbalance. Different definitions of the voltage unbalance are analyzed in [17] and by using these definitions the variation of the unbalance voltage in 3-D locus are plotted to reduce the range of the variation of terminal voltages.…”

Section: Introductionmentioning

confidence: 99%

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Precise Assessment of Performance of Induction Motor under Supply Imbalance Through Impedance Unbalance Factor

Singh¹,

Singh²

2013

Journal of Electrical Engineering

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This paper presents precise assessment of steady-state performance of induction motor (IM) operating under voltage unbalance. The variation of two voltage unbalance factors viz. complex voltage unbalance factor (CVUF) and impedance unbalance factor (IUF) with positive sequence voltage component, reveals that degree and manner of unbalance in supply voltage is exactly reflected in CVUF and IUF, respectively. On this basis, it is shown that for the precise assessment of IM performance, knowledge of both, manner (IUF) and degree (CVUF) of unbalance is important. Further, effect of angle of unbalance, on the performance of the IM and voltage pattern is analyzed. Results depict high sensitivity of derating factor and peak copper losses to this angle. Thus, it should be included along with unbalance factors for the precise and complete performance assessment of IM.

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Stabilization of mode in imbalanced operation of matrix converter by time‐delayed feedback control

Sánchez

Okuda

Hikihara

2018

Circuit Theory & Apps

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The symmetry breaking of the loads of a matrix converter (MC) generated an imbalance that induced a quasiperiodic behavior at the input side of the MC.In addition, the load imbalance generated a negative-sequence current at the input side. This paper adopts the time-delayed feedback control (TDFC) to attenuate the quasiperiodic oscillation and the negative-sequence component caused by the symmetry breaking. The results indicate that the attenuation of the quasiperiodic behavior directly leads to a decrease of the negative-sequence current component. As a result, the TDFC improves the operation of the MC under unbalanced loads and part of the periodic symmetry is regained at the input side.

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Heating of Induction Motors on Unbalanced Voltages

Cited by 85 publications

References 2 publications

Impact of mains connected three-phase induction motor loading levels on network voltage unbalance attenuation

Impact of mains connected three-phase induction motor loading levels on network voltage unbalance attenuation

Precise Assessment of Performance of Induction Motor under Supply Imbalance Through Impedance Unbalance Factor

Stabilization of mode in imbalanced operation of matrix converter by time‐delayed feedback control

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