Ultra-high-speed photographic observations of discharge development along the ice surface

Farzaneh, M.; Brettschneider, S.; Srivastava, K. D.; Li, S.Y.

doi:10.1049/cp:19990758

Cited by 9 publications

(8 citation statements)

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“…When a water lm was present on the surface of the ice ( gure 7b), the visible discharge activity started at some point on the ice surface and breakdown followed very quickly. Similar results, not presented here, were obtained with highly conductive dry-surfaced ice (Farzaneh et al . 1999b).…”

Section: (I) Discharge Initiation and Developmentsupporting

confidence: 92%

“…Very recently, a research project was undertaken, with the aim of understanding the discharge initiation mechanisms on ice surfaces and their evolution to ®ashover arc. Particularly, ultra-high-speed photographs, taken with a streak camera (Farzaneh et al . 1999b) and a high-speed frame camera (Zhang & Farzaneh 2000), were used to determine the initiation of visual discharge and its development, and the fundamental characteristics of arc, such as radius and propagation velocity.…”

Section: (C) Fundamental Aspects Of Discharge Initiation and Arc Propagation On The Surface Of Icementioning

confidence: 99%

“…Ultra-high-speed photographic observation of discharge initiation and development to ®ashover on ice surfaces, using metallic hemispherical capped electrodes half imbedded in ice ( gure 6), was recently carried out at the University of Québec in Chicoutimi (Farzaneh et al . 1999b), within the framework of the Industrial Chair on Atmospheric Icing of Power Network Equipment (CIGELE).…”

Section: (I) Discharge Initiation and Developmentmentioning

confidence: 99%

See 2 more Smart Citations

Ice accretions on high–voltage conductors and insulators and related phenomena

Farzaneh

2000

Philosophical Transactions of the Royal Society of London. Seri

184

171

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This paper proposes to survey a good part of the research work accomplished to date on the atmospheric icing of conductors and insulators in the presence of high voltage, with emphasis laid on the studies carried out at the University of Québec in Chicoutimi. The review covers laboratory testing and mathematical modelling.The role of several electrical parameters, such as electric eld strength and polarity, corona discharge, water droplet charge and ionic wind velocity, on the structure and amount of ice accretion on high-voltage conductors, is discussed.Concerning the icing of insulators, the initiation of electrical discharge on the ice surface, the formation of local arcs along the air gaps and their development to a ®ashover arc along the insulators are discussed. Basic experiments on the role of several major parameters relating to ice accretion, insulator characteristics and voltage type and polarity, on the maximum withstand voltage of short insulators, are also discussed. Finally, several measures for improving the withstand voltage of insulators are brie®y recalled.

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Section: (I) Discharge Initiation and Developmentsupporting

confidence: 92%

Section: (C) Fundamental Aspects Of Discharge Initiation and Arc Propagation On The Surface Of Icementioning

confidence: 99%

Section: (I) Discharge Initiation and Developmentmentioning

confidence: 99%

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Ice accretions on high–voltage conductors and insulators and related phenomena

Farzaneh

2000

Philosophical Transactions of the Royal Society of London. Seri

184

171

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“…In our previous investigations [4,[9][10][11], some of the ice surface discharge parameters were compared to those obtained with synthetic materials like Teflon (PTFE) and also with air gaps. The aim of those investigations was to quantify the difference in the behaviour of the corona discharge of the ice surface and the surface of the other insulating materials under the same conditions.…”

Section: Comparison Of Corona Discharges On Insulating Surfaces Ice S...mentioning

confidence: 99%

“…Accordingly, a thorough understanding of the physical mechanism by which ice-covered insulator surface flashover is initiated remains a vital investigative goal. The earlier studies carried out [7][8][9][10][11][12] discussed the physical phenomena involved in the ice surface flashover process. However, the surface corona discharge itself still needs to be further investigated, as a large number of phenomena involved are not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and analysis of corona discharge parameters on an ice surface

Farzaneh¹,

Fofana²

2004

J. Phys. D: Appl. Phys.

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The objective of this investigation is to understand the inception of ice surface corona streamers. A validated onset criterion that is useful for practical electrode geometries is presented. High-speed streak photography techniques were used to observe the streamers propagating over an ice surface. The effects of several experimental parameters such as freezing water conductivity and HV electrode radius on the streamer inception parameters of an ice surface have been examined. Empirical models have been proposed, based on elements derived from the inception parameters to account for corona streamer propagation velocity and inception voltage/field on an ice surface. Since the propagation velocity is a power function of the electric field, its value has been expressed in terms of the inception voltage.

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Study of visible discharge onset and development on ice surfaces

Farzaneh

Brettschneider²,

Srivastava³

Conference Record of the 2000 IEEE International Symposium on Electrical Insulation (Cat. No.00CH37075)

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This paper reports the results of a laboratory study on the first visible discharges developed on ice surfaces with micro air-gaps, using ultra high-speed photography. Two metallic hemispherical capped rods, 12 mm in diameter and half submerged in ice, were used. A relatively short air-gap was made at different locations in the ice, between the electrodes. The development of visible discharges, under lightning impulse voltage as well as the 50 % impulse lightning breakdown voltage were determined as a function of air-gap position and voltage polarity. The results found will contribute to a better understanding of combined air-gap and ice surface flashover, and could help for the design of insulators destined to cold climate regions.

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Ultra-high-speed photographic observations of discharge development along the ice surface

Cited by 9 publications

References 0 publications

Ice accretions on high–voltage conductors and insulators and related phenomena

Ice accretions on high–voltage conductors and insulators and related phenomena

Experimental study and analysis of corona discharge parameters on an ice surface

Study of visible discharge onset and development on ice surfaces

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