Contribution to study of visible discharge initiation and development on the ice surface =

Brettschneider, S.

doi:10.1522/12270314

Cited by 12 publications

(9 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

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

Farzaneh¹,

Fofana²

2004

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Farzaneh¹,

Fofana²

2004

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Previous works, which focused on the understanding of ice surface discharge characteristics [7][8][9], have revealed that discharge propagating on an ice surface involves more complex physical processes than on other insulator surfaces. The additional complexities arise partly/mainly from the existence of several sub-interfaces such as the ice/water film and the ice/air, and water/air interfaces.…”

Section: Introductionmentioning

confidence: 99%

Study of the Development of Positive Streamers Along an Ice Surface

Ndiaye

Farzaneh

Fofana

2007

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

This paper presents the results of fundamental investigations on the inception and propagation of corona discharge on an ice surface stressed with a standard lightning impulse voltage. High-speed photography and photomultiplier techniques were used to observe and record the propagation of the streamers. The effects of several experimental parameters such as freezing water conductivity and HV rod electrode radius on the streamer inception parameters were investigated. Moreover, time to first streamer, inception voltage and corresponding field, as well as streamer propagation velocity and charge deposited by a streamer on ice surface were measured. The results are discussed and emphases are laid on the main factors influencing the development of positive streamers on ice surface.Index Terms -Outdoor insulation, atmospheric icing, ice surface, high-speed camera, streamer inception, streamer propagation velocity, surface charge, flashover.

show abstract

“…The proposed research was carried out using the following methods that were chosen based on previous models (different geometries of ice samples: triangular [83][84][85], cylindrical [24,82], and rod-rod or rod-plane system in a small Plexiglas mould [19,67,86 and 87]), which have been demonstrated to be effective and successful in CIGELE's research laboratory.…”

Section: Discussionmentioning

confidence: 99%

Mechanisms of arc propagation over an ice surface /

Farokhi¹

2010

View full text Add to dashboard Cite

Outdoor insulation design with regard to pollution and icing performance is a critical factor for reliability of overhead transmission lines. The majority of failures occurring on transmission lines are caused by environmental conditions such as lightning, pollution and/or ice. Accumulated ice on insulators may initiate corona discharge; these partial arcs sometimes lead to flashover. This phenomenon is mainly caused by the presence of a highly conductive water film on the surface of the ice and ice-free zones, often called air gaps, along the insulators, and decreased insulator leakage distance caused by ice bridging.The general objective of this research is to investigate the physical mechanisms involved in the propagation of electric arc on the surface of ice. In the present research work, high-speed photography techniques was combined with synchronized electrical measurements to study the various parameters of arc on an ice surface, such as channel radius and propagation velocities. These results, together with studying the propagation patterns and arc foot geometries, provide background information for understanding the complete flashover phenomenon. Arc root structure, current profile, propagation pattern and velocity were investigated under positive and negative polarities. Water film conductivity and thickness, and relative air humidity were also analyzed as influencing parameters of arc propagation. The effects of different mechanisms, e.g. collision and thermal ionization, buoyancy force and electrostatic force, on different stages of arc propagation are also discussed.Repetitive patterns corresponding to arc decays were observed during arc propagation. During arc re-ignitions, an anode-directed streamer was found to be dominant, regardless of the polarity of applied voltage. The arc root under de-positive applied voltage was branched; on the contrary, the negative arc root appeared as a diffused luminous region. In the arc channel section, two distinct regions were distinguished. A linear relationship between the initiation current and the inverse of residual resistance was established, showing how important is the effect of water film thickness on the initiation of discharge. It was found there is a direct relationship between the slope of current increase and the applied water conductivity. Air humidity increases the voltage gradient along the arc channel and reduces the discharge activities at the arc tip. However, it could influence the arc formation and its propagation by changing the thickness of the water film. A change in the dominant mechanism from thermal ionization to collision ionization in the enhanced electric field was found to be responsible for the flashover. Tare. L'effet de différents mécanismes comme les collisions et l'ionisation thermique, la force de flottabilité et la force électrostatique sur les différentes étapes de la propagation de l'arc ont également été discutés. 11 RESUME

show abstract

Contribution to study of visible discharge initiation and development on the ice surface =

Cited by 12 publications

References 59 publications

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

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

Study of the Development of Positive Streamers Along an Ice Surface

Mechanisms of arc propagation over an ice surface /

Contact Info

Product

Resources

About