Influence of impulse voltage repetition frequency on RPDIV in partial vacuum

Meyer, Doris Ragna; Cavallini, A.; Lusuardi, Luca; Barater, Davide; Pietrini, Giorgio; Soldati, Alessandro

doi:10.1109/tdei.2018.006722

Cited by 54 publications

(34 citation statements)

References 19 publications

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“…As can be seen, P DIV and repetition rate are mildly influenced by the supply frequency. On the contrary, by decreasing the pressure the P DIV decreases largely, as also reported by other authors [9]- [11].…”

Section: Resultssupporting

confidence: 87%

“…1. In these tests the voltage was raised in step of 25 V pkpk , with a step length dependent on the pressure so to maintain constant the probability of a starting electron [9]. Table I shows the step length values chosen in detail.…”

Section: Methodsmentioning

confidence: 99%

“…The electronic energy also increases slightly. This means that at even higher frequencies (think that the new devices in Gallium Nitride can reach even 1 MHz switching frequency [9]) maybe the discharges, in addition to being several orders of magnitude more frequent, are also more energetic, so they are easier to break the polymeric chain bonds.…”

Section: B Impact Of Pressurementioning

confidence: 99%

See 2 more Smart Citations

Assessing the severity of partial discharges in aerospace applications

Lusuardi

Rumi

Neretti

et al. 2019

2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Current standards base the evaluation of partial discharge (PD) harmfulness on their amplitude and repetition rate. This work shows how, on the contrary, the non conventional environmental conditions introduced by aerospace applications (i.e. low-pressure atmosphere, higher frequency supplies) lead respectively to lower or unchanged PD apparent charges, which are however characterized by different mean energies, hence destructive potential, in a counter intuitive manner.

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Section: Resultssupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: B Impact Of Pressurementioning

confidence: 99%

See 1 more Smart Citation

Assessing the severity of partial discharges in aerospace applications

Lusuardi

Rumi

Neretti

et al. 2019

2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

Self Cite

View full text Add to dashboard Cite

show abstract

“…The question of how to take account of the effect of environmental and electrical parameters in the qualification tests for insulation, which the standards do not take into account, should be addressed. As far as altitude and frequency are concerned, several works seem to suggest that there is a linear relationship between these and the P DIV in the range of interest [15]- [17], so it is possible to consider adding an enhancement factor to those already existing in IEC 60034-18-41 [7], in order to correctly establish the test voltages. Table I shows a possible proposal.…”

Section: Discussion On Some Pd Testing Proceduresmentioning

confidence: 99%

Assessment Techniques to Ensure Reliable Electrical Insulation for More Electric Transportation

Lusuardi

Rumi

Cavallini

2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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Partial discharge testing of complete, low-voltage induction machines and dry-type convertor transformers for the More Electric Transportation is discussed. The current standard (i.e. IEC 60034-18-41, 60317-0-1 and 61378-1) offers very few answers to the new challenges posed to the insulating systems reliability of these increasingly electrified electrical machines. Based on tests performed on different kind of specimens and the literature, the most promising assessment technique to ensure a reliable insulation is based on optical sensors. In addition, this work seeks to give some precise, but simple, indications on how to take into account the effect of altitude and high frequency in the qualification of an insulation system for More Electric Transportation and the limits of the different standards involved are highlighted.

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“…During machining, the conventional conductive materials and tools vibration are never a problem as the amplitude of the wire is rather less than the discharge gap and can be evaluated in a few nanometers at the distance between the nozzles of less than 100 mm [33]. During machining with the materials that have low conductivity with a smaller discharge gap and agglomeration of the erosion and assisting products in the working zone, short circuits caused by many factors including wire self-oscillations can occur even at a distance less than 100 mm [34,35].…”

Section: Introductionmentioning

confidence: 99%

Electrical Discharge Machining of Oxide Nanocomposite: Nanomodification of Surface and Subsurface Layers

Grigoriev

Волосова

Okunkova

et al. 2020

JMMP

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The work is devoted to the research of the changes that occur in the subsurface layer of the workpiece during electrical discharge machining of conductive nanocomposite based on alumina with the use of a brass tool. The nanocomposite of Al2O3 + 30% of TiC was electroerosively machined in a water and hydrocarbon oil. The process of electrical discharge machining is accompanied by oscillations that were registered by diagnostic means. The obtained surface of the samples was researched by the means of scanning electron microscopy and X-ray photoelectron spectroscopy. The observed surface and subsurface changes provide grounding for the conclusions on the nature of processes and reactions that occur between two electrodes and nanomodification of the obtained surfaces that can be an advantage for a series of applications.

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Influence of impulse voltage repetition frequency on RPDIV in partial vacuum

Cited by 54 publications

References 19 publications

Assessing the severity of partial discharges in aerospace applications

Assessing the severity of partial discharges in aerospace applications

Assessment Techniques to Ensure Reliable Electrical Insulation for More Electric Transportation

Electrical Discharge Machining of Oxide Nanocomposite: Nanomodification of Surface and Subsurface Layers

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