Creepage discharge characteristics over solid-liquid interfaces with grounded side electrode

Hanaoka, Ryoichi; Kohrin, T.; Miyagawa, Tomokazu; Nishi, Toshiyuki

doi:10.1109/94.993749

Cited by 48 publications

(11 citation statements)

References 6 publications

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“…Notice the linear correlation between the streamer length and the voltage. This linear correlation indicates a constant potential gradient along the streamer channel [2,8,13,14,19,32]. The estimates of the potential gradient (E) are presented in the legend of the figures.…”

Section: Inception and Threshold Propagation Voltage V 2 Of 2nd Mode mentioning

confidence: 95%

“…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%

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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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Section: Inception and Threshold Propagation Voltage V 2 Of 2nd Mode mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…It is thought that this is due to the charging effect of the bakelite surface [7]. When the impulse voltage of a positive or negative polarity is applied to a needle electrode, the electric charges are adhered to the bakelite surface by the propagation of streamers with the same polarity as the voltage.…”

Section: Discharge Shapes and Discharge Scars Under Successive Impmentioning

confidence: 99%

Creeping discharges in transformer oil under lightning impulse voltages over 100 kV peak value

Yamamoto

Uozaki

Hanaoka

et al. 2008

2008 IEEE International Conference on Dielectric Liquids

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This paper describes the experimental results on the creeping streamer progressing the surface of a bakelite board immersed in transformer oil under the application of a standard lightning impulse voltage with peak values of ±100～350 kV. The growth of streamers is significantly affected by the thickness of bakelite board and the streamers are extended longer exponentially for the applied voltage more than ~±200 kV. These streamers leave the remarkable discharge scars on the bakelite surface. The discharge scars are different by the voltage polarity which influences strongly to the streamer growth. The mean streamer velocities in both polarities have also been examined.

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“…Studies of guided and unguided second mode positive streamers creeping over liquid-solid interfaces include the characterization of some of their main electrical parameters [1]: The potential gradient across the streamer filament [5]- [7], the influence of the thickness and permittivity of the solid on the current of the streamer filament [1], [8], [9] and the influence of the solid materials on the shape of the streamer [10] are some examples. Also, the mechanism of 'self-stabilization' by branching of the streamer in liquids such as mineral oil and alkanes has been shown by experiments with polymeric tubes restricting the streamer branching [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of paper properties on streamers creeping in mineral oil

Ariza

Becerra

Methling

et al. 2017

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)

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This work presents an experimental study of second mode positive streamers propagating along mineral oilpaper interfaces. A point-plane arrangement immersed in mineral oil with the paper inclined 60 degrees to the plane electrode is used to create the liquid-solid interface. Kraft paper and a kraft fibril paper, made from cellulosic micro and nano fibrils, with higher density and lower surface roughness are used as the solid materials. High speed shadowgraphy and charge recordings are used to compare the propagation of second mode positive streamers along the mineral oil-kraft paper and mineral oil-kraft fibril paper. Streamers creeping along the mineral oilkraft paper interface propagate mainly into the liquid, with one or two main filaments. In comparison, the streamers propagating along the kraft fibril paper show a strong reduction of the branching; these streamers consist of a single filament that propagates exactly on the solid surface. Streamers along the kraft fibril paper also have longer propagation time than for the case with kraft paper. Mutual electrostatic shielding between filaments is observed for the streamers creeping on the kraft paper. An electrostatic analysis of the influence of permittivity, density and surface roughness of the solid in the electrical properties of the streamer filaments is also performed.

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Creepage discharge characteristics over solid-liquid interfaces with grounded side electrode

Cited by 48 publications

References 6 publications

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

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

Creeping discharges in transformer oil under lightning impulse voltages over 100 kV peak value

Influence of paper properties on streamers creeping in mineral oil

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