Influence of PWM technique on breakdown in twisted pairs

Rao, Sanjay; Elanseralathan, K.

doi:10.1109/catcon.2017.8280258

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…It shows that the latter situation always contributes to longer insulation lifetime. [70] also shows the same tendency, when a twisted pair is excited by PWM waveform, and the frequency is varied from 10 kHz to 30 kHz.…”

Section: ) Frequencymentioning

confidence: 59%

“…The insulation lifetime under PWM with sharp jump voltage is shorter than that under pure PWM waveform conditions. PD under PWM waveform and PWM-peak waveform (with and without sharp jump voltage) is tested in [70] to analyze the twisted pair insulation lifetime. It found the shape of the excitation voltage will influence the breakdown voltage of the test objects.…”

Section: ) Applied Voltagementioning

confidence: 99%

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Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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Variable speed drives (VSDs) are widely utilized to control motors such as pumps, compressors, fans, etc. However, the endurance of motor winding insulation under repetitive voltage pulse excitation is weakened, resulting in premature failure and shortening the expected operating life. This article reviews the literature of investigations spanning the last two decades on the problem. Researchers have focused on different aspects to explain this from a particular angle. The precise mechanism is complicated as a number of interacting factors contribute to premature insulation failure. Insulation degradation in motors can be attributed to thermal, mechanical, chemical, and electrical stress. It seems that space charge accumulation and partial discharge (PD) are the two main influences; the former can exacerbate the electric stress distribution whilst the latter promotes insulation deterioration.

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Section: ) Frequencymentioning

confidence: 59%

Section: ) Applied Voltagementioning

confidence: 99%

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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“…The variation in breakdown voltages over the frequency with waveforms is depicted in Figure 3. From the graph, it is evident that the Square, Square-rising and Square-spike waveforms exhibit two straight lines with varying slopes as in [19], with a rise in the frequency from 10-30 kHz. It is observed from the graphs the breakdown voltage of Square-rising waveform is more than that of Square-spike and Square waveforms.…”

Section: Resultsmentioning

confidence: 94%

Modeling of high frequency high voltage of waveforms on life of enamel insulation

Rao¹,

Kasinathan²

2021

IJEECS

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<p>In recent years it has been observed that insulation failure in electrical motors is caused by adjustable speed drives fed by power electronic converters. These converters produce impulse waveforms having a high slew rate generated by the high switching frequency of IGBTs. This paper focuses on high switching frequency stress in low voltage electrical motors for adjustable speeds. To examine the motor winding insulation under such stress twisted-pair samples were developed from enameled wires. A single-coated polyester of enamel with a thickness of 40 microns is used for this work. High-frequencies, high voltages of Square, and Square-rising, Square-spike waveforms of 10-30 kHz are used here. The test results show that the insulation fails earlier for the Square waveform compared to the Square-spike and Square-rising waveforms. In a nutshell, there is an analysis of PD formation in the insulation system at a higher switching frequency is analyzed. Electric field distributions between twisted pairs with various air gaps of the insulation system stressed by the Square and Square-rising waveforms up to 30 kHz are modeled using COMSOL software.</p>

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Insulation Life Span of Low-Voltage Electric Motors—A Survey

Höpner

Wilhelm

2021

Energies

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The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial discharges between conductors, causing degradation of the insulation of electric motors. Understanding the effects resulting from the frequency converter–electric motor interaction is essential for developing and implementing insulation systems with characteristics that support the most diverse applications, have an operating life under economically viable conditions, and promote energy efficiency. With this objective, a search was carried out in three recognized databases. Duplicate articles were eliminated, resulting in 1069 articles, which were systematically categorized and reviewed, resulting in 481 articles discussing the causes of degradation in the insulation of electric motors powered by frequency converters. A bibliographic portfolio was built and evaluated, with 230 articles that present results on the factors that can be used in estimating the life span of electric motor insulation. In this structure, the historical evolution of the collected information, the authors who conducted the most research on the theme, and the relevance of the knowledge presented in the works were considered.

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Influence of PWM technique on breakdown in twisted pairs

Cited by 3 publications

References 18 publications

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Modeling of high frequency high voltage of waveforms on life of enamel insulation

Insulation Life Span of Low-Voltage Electric Motors—A Survey

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