Journal ArticleDOI
Partial discharge characteristics of inverter-fed motor coil samples under ac and surge voltage conditions
Hitoshi Okubol,Yonghu Lu,Naoki Hayakawa +2 more
- Vol. 21, Iss: 1, pp 5-10
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TLDR
In this article, the partial discharge (PD) characteristics of twisted pair samples for inverter-fed motor coil under ac and surge voltage conditions were investigated and the difference in the PD inception characteristics of a twisted pair under 60-Hz voltage and surge voltages with a steep wave front.Abstract:
This work investigates the partial discharge (PD) characteristics of twisted pair samples for inverter-fed motor coil under ac and surge voltage conditions. It also discusses the difference in the PD inception characteristics of a twisted pair under 60-Hz voltage and surge voltages with a steep wave front. The PDIV under ac voltage was measured and was found to agree well with the theoretical value using electric field analysis and Paschen's law. The PDIV under surge voltage was measured for different repetition rates and the PDIV for 60-pps repetition was found to be lower than those for 6 pps and for the single shot, which suggested that the electrical insulation performance would be influenced by the repetition rate. The PDIV under surge voltages was 1.5 to 1.8 and 2.3 to 2.7 times higher than those under AC voltage application for the used and virgin samples, respectively.read more
Citations
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Journal ArticleDOI
A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems
TL;DR: An in-depth literature review of testing and monitoring methods that diagnose the condition of the turn-to-turn insulation of low-voltage machines, which is a rapidly expanding area for both research and product development efforts.
Journal ArticleDOI
Effect of rise time on PD pulse features under repetitive square wave voltages
TL;DR: In this article, the influence of repetitive square wave voltage rise time on partial discharge pulse characteristics in the ultra-high frequency range was investigated using single-point contact crossed pairs with a wide range of rise times, from 200 ns to 400 μs.
Journal ArticleDOI
Technical Development on Partial Discharge Measurement and Electrical Insulation Techniques for Low Voltage Motors Driven by Voltage Inverters
TL;DR: In this article, the up-to-date research activities on electrical insulation techniques under repetitive surge voltages with steep wavefront for low voltage inverter-fed motors are reviewed.
Journal ArticleDOI
Effects of discharge area and surface conductivity on partial discharge behavior in voids under square voltages
TL;DR: In this article, the transitions of PD behavior with aging in a void under ac voltages with sine wave and square wave were observed, and the transition of the PD magnitude with aging under square wave showed the same tendency as that under Sine wave.
Journal ArticleDOI
Influence of rise time on partial discharge extinction voltage at semi-square voltage waveforms
TL;DR: In this paper, the authors present measurements of the partial discharge (PD) extinction voltage in three different types of test objects, using semi-square voltages with 2?s and 100?s rise time.
References
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Book
Electrical breakdown of gases
John M. Meek,J. D. Craggs +1 more
TL;DR: In this paper, a collection of individual works on electrical discharges is presented, including fundamental processes in the electrical breakdown of gases, vacuum breakdown, spark breakdown in uniform fields, corona discharge, and burst in non-uniform fields.
Journal ArticleDOI
Failure mechanism of the interturn insulation of low voltage electric machines fed by pulse-controlled inverters
TL;DR: In this paper, the failure mechanism of low voltage interturn insulation as a consequence of partial discharges is described and why and how it is influenced by the insulation design, temperature, and the applied voltage.
Proceedings ArticleDOI
Failure mechanism of the interturn insulation of low voltage electric machines fed by pulse controlled inverters
TL;DR: In this paper, the authors investigated the relationship between the PD inception voltage and velocity of the resulting electrical ageing, depending on the voltage characteristics, insulation design and temperature of the interturn insulation.
Proceedings ArticleDOI
Effect of surge voltage risetime on the insulation of low voltage machines fed by PWM converters
TL;DR: In this paper, the authors investigated the repetitive surge-voltage withstand of lowvoltage mush-wound machines operated on adjustable-speed drives using insulated gate bipolar transistor (IGBT) semiconductor technology.
Proceedings ArticleDOI
Discharge condition and surface charge distribution under repetitive bipolar impulses
TL;DR: In this paper, the behavior of partial discharge under repetitive bipolar impulse voltage was investigated on 50 /spl mu/m air gap between J-shaped enameled wire and plane electrode with polyimide film.