Voltage distribution in the stator winding of an induction motor following a voltage surge

Oyegoke, Bolarin

doi:10.1007/s002020050011

Cited by 20 publications

(6 citation statements)

References 11 publications

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“…The length, characteristic impedance and per unit electrical parameters of the feeding cable have important meaning for working of inverter-cable-motor system, because in many situations can result in unwanted resonances and oscillations [3,7,10,11]. Fast changing voltage at motor terminals causes a change of voltage distribution in the stator winding and leads to an increase in inter-turn voltage in certain parts of the winding, in relation to the distribution at AC 50/60 Hz [12,13]. As result, local voltage increasing may be sufficient for the occurrence of electric field stress initiating of PD activity.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 3 presents simplified examples of specific defects, especially PD sources, that can occur in insulating systems of random-wound windings. Fast changing voltage at motor terminals causes a change of voltage distribution in the stator winding and leads to an increase in inter-turn voltage in certain parts of the winding, in relation to the distribution at AC 50/60 Hz [12,13]. As result, local voltage increasing may be sufficient for the occurrence of electric field stress initiating of PD activity.…”

Section: Introductionmentioning

confidence: 99%

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Partial Discharges in Insulating Systems of Low Voltage Electric Motors Fed by Power Electronics—Twisted-Pair Samples Evaluation

2019

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Power electronics switching devices currently represent the dominant technology for supplying low voltage (LV) electric motors. The fast switching processes exert a different class of stress on dielectric insulating materials than standard sinusoidal excitations. Such stresses result in an increase in the dynamic activity of the working electric field, which in turn lead to an increased likelihood of partial discharges (PD). The stator design of low voltage motor is often in form of random-wound windings, where the magnet wires (copper or aluminum round wires coated with thin layer of insulation) form a common system of coils with not precisely defined mutual position of particular turns, resulting in various turn-to-turn and coil-to-coil voltage distributions. Pulse Width Modulated (PWM) voltage waveforms from modern electronic inverters are characterized by very short rise times and presence of repetitively occurring overvoltages that can significantly stress the insulation of feeding cables and motors. These factors influence the inception and dynamics of PD and processes of space charge accumulation in electrical insulation. In this paper investigations performed on round magnet wire twisted-pair samples representing LV motor random-wound winding elements are presented. Special attention was afforded to the twist configurations, observed breakdown voltage and PD activity. To describe the field conditions for the formation of PD in the turn-to-turn insulation system, the results of numerical simulations of electric field distributions for winding wires with different diameters, modeled using the COMSOL program, were analyzed. PD created in the insulating systems of model twisted-pair systems were registered and analyzed using the phase resolved partial discharge analysis (PRPDA) method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Partial Discharges in Insulating Systems of Low Voltage Electric Motors Fed by Power Electronics—Twisted-Pair Samples Evaluation

2019

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“…The lossless Bergeron travelling‐wave technique is another numerical approach [12] which cannot be applied for over‐voltage analysis of coils of electric machines [13, 14], to overcome this problem, the series lumped resistor in each node can be suggested [4]. In addition, so as to analyse the shaft voltage of an electric machine, modelling of the rotor and bearings are necessary.…”

Section: Methods For Analysis Of High‐frequency Effects In Electricmentioning

confidence: 99%

Survey on high‐frequency models of PWM electric drives for shaft voltage and bearing current analysis

Asefi

Nazarzadeh

2017

IET Electrical Systems in Transportation

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In this study, a review on high-frequency modelling in electric machines is conducted. Pulse-width modulation (PWM) creates common-mode-voltage (CMV) and common-mode-current (CMC) in electric drives with high-frequency impacts such as shaft voltage and bearing current which in turn cause bearing failures. To predict and reduce these failures in an electric machine, transitional modelling of high-frequency pulses is necessary. At the first step, several methods for high-frequency modelling in an electric drive are categorised. At the second step, several types of bearing currents discussed and CMV and CMC in electric drives are introduced. At the third step, CMV, CMC and bearing currents are simulated for six types of PWM methods and experimental verification is reported. Finally, root-mean-square value of a distorted parasitic current is introduced for comparing the electromagnetic effects of PWM methods.

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“…Work by Gupta [135][136][137] and many others [138][139][140][141][142][143][144][145][146][147][148][149][150][151][152][153][154] neglect the damping of the traveling waves; therefore it cannot predict the maximum voltage stress of the winding insulation. The breakdown of the insulation depends on the voltage stress integrated over time.…”

Section: Reliabilitymentioning

confidence: 99%

Impact of Poor Power Quality on Reliability, Relaying and Security

Masoum¹,

Fuchs²

2015

Power Quality in Power Systems and Electrical Machines

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Voltage distribution in the stator winding of an induction motor following a voltage surge

Cited by 20 publications

References 11 publications

Partial Discharges in Insulating Systems of Low Voltage Electric Motors Fed by Power Electronics—Twisted-Pair Samples Evaluation

Partial Discharges in Insulating Systems of Low Voltage Electric Motors Fed by Power Electronics—Twisted-Pair Samples Evaluation

Survey on high‐frequency models of PWM electric drives for shaft voltage and bearing current analysis

Impact of Poor Power Quality on Reliability, Relaying and Security

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