Accumulative effect on streamer propagation of lightning impulses on oil/pressboard interface

Liu, Qiang; Wang, Zhongdong; Dyer, Paul S.; Walker, David T.

doi:10.1109/icdl.2011.6015432

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…In 2011, the development processes of streamers at the interface between oil and OIP were observed [124, 125]. The authors of the cited studies found that, under the application of repetitive lightning impulses, the length of the streamer grows with an increasing number of impulse applications.…”

Section: Accumulative Failure Of Oil–paper Insulationmentioning

confidence: 99%

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Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

et al. 2019

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The premature failure phenomenon that occurs in solid insulation under the application of repetitive impulse voltages is known as the accumulative effect of impulse voltages on a solid dielectric. The accumulative failure of winding insulation is considered to be a core problem resulting from this phenomenon. The main problems include the accumulative failure of motor winding insulation under pulse-width modulation impulses and the accumulative failure of transformer winding insulation under the application of overvoltages, and these problems represent new challenges in the safe and stable operation of power grids. With regards to the above problems, this study reviews the results of recent research on the accumulative failure characteristics and mechanisms of winding insulation when subjected to repetitive impulse voltages. The challenges faced are discussed at the end of this study.

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Section: Accumulative Failure Of Oil–paper Insulationmentioning

confidence: 99%

“…However, this phenomenon was not detected when the OIP was removed. This indicates that the accumulative effect appears not only during dielectric breakdown but also on flashover at the oil–paper interface [124, 125].…”

Section: Accumulative Failure Of Oil–paper Insulationmentioning

confidence: 99%

Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

et al. 2019

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“…A wide characterization of the inception and propagation of 2nd mode positive streamers have been performed by several authors along liquid/solid interfaces [11][12][13][14][15]. Different studies report the influence of the thickness and permittivity of the solid on the current, charge and shape of the streamer filaments [11,[15][16][17][18][19][20][21], the existence of a potential gradient across the streamer [8,13,14], the accumulative effect of multiple streamers initiated at a liquid/solid interface and the influence of the chemical composition of the oil [15,21,22], etc. All these studies highlight the importance of the bulk properties of the solid material (i.e.…”

Section: Introductionmentioning

confidence: 99%

Positive streamers: inception and propagation along mineral-oil/solid interfaces

et al. 2020

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This paper presents an experimental characterization of the prebreakdown phenomena in liquid/ solid interfaces. The characterization is devoted to the 2nd mode positive streamers initiated and propagated along interfaces of mineral-oil and solids with different chemical composition and physical properties. Polymers of low density polyethylene (LDPE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE) polyvinylidene fluoride (PVDF) and papers made of kraft paper and a kraft fibril paper (made from cellulosic micro and nano fibrils), lignin-free paper and paper with high lignin content (referred to as k107 kraft paper) are used as the solid to study their influence on the streamer inception and propagation. The streamers are initiated at the interface by applying steps of voltage to a point-plane electrode arrangement with a solid (dielectric barrier) into the gap. The solid is placed diagonal to the oil gap and near to the point electrode. Shadowgraphs, charge and light intensity recordings are obtained during the inception and propagation of the streamers. Thus, estimations of the streamer length, velocity, current and average charge, are also presented. A time delay has been observed before the initiation of the streamer. This delay is probably correlated to the initiation process and formation of the gaseous phase of the streamer near to the interface. The threshold propagation voltage of the 2nd mode streamers at mineral-oil/solid interfaces is shown to be independent of the interface. However, the inception voltage is highly influenced by the interface. Additionally, the observed characteristics of streamers propagation (e.g. current, length, velocity, etc) along the tested interfaces cannot be fully explained by a capacitive coupling effect (permittivity mismatch). This open a discussion for the possibility that properties of the solid such as chemical composition, wettability and surface roughness can influence the streamer propagation.

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“…This type of discharges (creeping discharges) has been the subject of numerous studies [1][2][3][4][5][6][7][8][9][10][11][12][13]. It appears from the different results reported in the literature that the morphology of these discharges and the associated characteristics depend among others things on the thickness of solid insulator and the dielectric constant of both constituents (insulator and oil).…”

Section: Introductionmentioning

confidence: 99%

Influence of hydrostatic pressure on creeping discharge characteristics over solid/liquid insulating interfaces under AC and DC voltages

Béroual

Khaled

2018

IET Generation, Transmission & Distribution

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Accumulative effect on streamer propagation of lightning impulses on oil/pressboard interface

Cited by 12 publications

References 8 publications

Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

Review of accumulative failure of winding insulation subjected to repetitive impulse voltages

Positive streamers: inception and propagation along mineral-oil/solid interfaces

Influence of hydrostatic pressure on creeping discharge characteristics over solid/liquid insulating interfaces under AC and DC voltages

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