Transient distribution of voltages in induction machine stator windings resulting from switching of power electronics

Nußbaumer, Peter; Zoeller, C.; Wolbank, T.M.; Vogelsberger, M. A.

doi:10.1109/iecon.2013.6699638

Cited by 22 publications

(11 citation statements)

References 11 publications

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“…The severity of the deviation is decreasing if the same capacitance or resistance value is placed parallel to a single coil in the middle of a phase or at the last coil at the star point. In literature the line-end coil suffers the most from stress through overvoltage [12]- [13] and thus insulation degradation is likewise at the first windings. This tendency can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Stimulating and detecting changes in the insulation health state of inverter fed ac machines

Zoeller

Vogelsberger²,

Nußbaumer³

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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In modern traction drive applications condition monitoring is getting more and more important. Insulation health state monitoring can be done by evaluating the high frequency current response to voltage step excitation by the signal analyses of the current sensors, which are also used for the control of the machine. This reduces the costs and number of necessary system components. A change in the current response is, amongst others, correlated to a change through insulation degradation. The dominant influencing parameters of the high frequency current response of the machine are parasitic winding capacitances as well as insulation resistances, which are slowly changing over time if the insulation is deteriorated through different stresses, e.g. thermal or electrical. These slow changes can be monitored over long time period and give evidence if additional maintenance steps are required. Thus an unforeseeable outage of the traction drive system caused by damage of the machine can be prevented. Before the insulation state can be evaluated certain signal processing steps are necessary to increase the sensitivity. In this work the method of stimulation as well as detection of changes in the dominant parameters is verified on a 1.4MW induction machine.

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Section: Resultsmentioning

confidence: 99%

Stimulating and detecting changes in the insulation health state of inverter fed ac machines

Zoeller

Vogelsberger²,

Nußbaumer³

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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“…Additionally, to emulate insulation degradation of a small section in one phase, a capacitor is placed parallel one coil with focus on the first coil at the terminal connection. Different investigations of voltage distributions at inverter-fed drives show that the highest overvoltage occurs in the first coils (at terminal phase connection) of the machine's stator winding and hence these turns are subject to the highest stress [12]- [13]. In addition, capacitors are placed parallel a whole phase to emulate a degradation with higher severity.…”

Section: Resultsmentioning

confidence: 99%

Influence of fast inverter switching based on SiC semi-conductors on online insulation monitoring of high power traction machines

Zoeller

Ertl

Wolbank

et al. 2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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In modern drive applications fed by voltage source inverters, monitoring systems are of advantage to reduce the maintenance costs and prevent outages. The proposed insulation monitoring method detects stator insulation defects by evaluating the current's transient response after step excitation by the inverter. Due to fast switching of the voltage source inverter at high output voltage dv/dt rates, increased stress appears on the insulation and leads to deterioration. Prior an actual breakdown occurs, the machine's high-frequency behavior is altered and a change in the transient part in the current response following a step excitation can be used to indicate insulation degradation. The paper presents experimental results of a 1.4 MW induction machine, fed by SiC semiconductor inverter technology. Additionally, variations of the inverter output voltage switching rate were implemented and the effect on the monitoring method is analyzed.

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“…As reported in numerous surveys at diverse specific environments by previous researchers, to gain absolute and definitive knowledge in transients [3,9,5,22,23]. Some of such studies confined to certain margins like power capacity, the type of induction motors [1,4] and some studies have been carried out extensively with wide view in power quality phenomenon [2,16,19,[24][25][26][27]. Though there were few works carried out at installations and cabling [8,9,28,29], no fitting pursuit in to tea factories has been done, to detect the veiled risk due to this silent killer of valuable equipment which create leeway of millions of moneys.…”

Section: Discussionmentioning

confidence: 99%

“…In most of power-quality literature, transients are mainly focused as an anomalous condition arise at the front end of power elements and steepness, amplitude and duration like single event characteristics are allocated much weight [16,24,25,30]. This is true as the transient burden do not exhibit significant and clear affliction in short time, like other major voltage interruptions.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Switching Transients in Low Voltage Power Systems of Tea Factories in Sri Lanka

Pannila¹,

Edirisinghe²

2020

EJEE

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Voltage transients caused by various motors and electrical equipment of tea factories in Sri Lanka have been observed and analyzed. While reporting the major components of transients, this work extends it aspires to investigate the risk of having faults in a three-phase induction motor by monitoring and analyzing the transient voltage waveforms during the starting period. Therefore, common mode transient investigations have been followed. Transient voltage signals have been obtained from high end test setup and altogether 588 waveforms have been analyzed in both the time and frequency domains. In DOL and Star-Delta starting, highest transient amplitude of 688.2 V and 572.1 V have been observed respectively. Highest transient amplitude of 976.4 V and 980.5 V were observed in DOL and Star-Delta switching respectively. Withering and rolling sections dominates over other stages, generating high amplitude transients in average, reflecting same endangerment in energy calculations as presented in voltage integral. DOL starting transients carries fast rise times as 14 ns and in Star-Delta it is 28 ns. In order to assist with the exegesis of these data, transient parameters like rise time, duration, highest peak, etc.… have also been presented in statistical basis.

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Transient distribution of voltages in induction machine stator windings resulting from switching of power electronics

Cited by 22 publications

References 11 publications

Stimulating and detecting changes in the insulation health state of inverter fed ac machines

Stimulating and detecting changes in the insulation health state of inverter fed ac machines

Influence of fast inverter switching based on SiC semi-conductors on online insulation monitoring of high power traction machines

Characterization of Switching Transients in Low Voltage Power Systems of Tea Factories in Sri Lanka

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