DC and pulsed dielectric surface flashover at atmospheric pressure

Krile, J.; Neuber, A.; Dickens, J.; Krompholz, H.

doi:10.1109/tps.2005.852407

Cited by 40 publications

(17 citation statements)

References 6 publications

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“…On top of that, it is a challenge to produce a similar set of samples with the same finish all over the surface of the sample. For these reasons, an alternative flashover system is constructed in a typical surface breakdown arrangement as used by various authors [181][182][183] in which the breakdown is likely to occur along the sample surface and in between the triple junctions of electrode-epoxy-air as pictured in Figure 7-2. The tips of the electrodes are shaped like a finger with sharp edges as to generate corona effect in order to make sure that the flashover does occur at the tip of the electrodes.…”

Section: Flashover System Designmentioning

confidence: 99%

Surface fluorinated epoxy resin for high voltage DC application

Mohamad

Chen

Zhang

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Charge build up under high voltage DC is a significant concern in the transmission system as its presence may distort the local electric field. By chemically treat polymeric insulation via directfluorination, and plasma enhanced fluorination process, the charge transport characteristics of the material can be modified. In doing so, excellent surface properties similar to those of fluoropolymers can be attained without compromising the bulk properties of the original polymeric insulation. The change in chemical components at the surface of polymeric insulation should lead to a corresponding change in dielectric properties at the surface and consequently may suppress the occurrences of charge build up. In this research, epoxy resin samples with various surface fluorinating conditions were formulated and treated. The samples then were characterised by SEM and EDX analysis, Raman spectroscopy, and DC surface conductivity measurements. To further explain the effects of fluorination treatment, modelling of the electric field and current density distribution had been carried out. Surface potential decay tests from corona discharge, as well as PEA measurements, show that there is a significant change in decay characteristics with the introduction of surface fluorinated layer. The decay mechanisms responsible for the observed

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Section: Flashover System Designmentioning

confidence: 99%

Surface fluorinated epoxy resin for high voltage DC application

Mohamad

Chen

Zhang

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…The electrode system is constructed in a typical surface breakdown arrangement as used by various authors [10][11][12] in which the breakdown is likely to occur along the surface between the triple junctions of electrode-sample-gas. This test apparatus is designed to study the surface flashover strength of fluorinated epoxy samples of different fluorination times inside a controlled environment.…”

Section: Flashover In Nitrogen Gas Testmentioning

confidence: 99%

Influence of fluorination time on surface flashover of epoxy in insulating gas

Mohamad

Chen

2015

2015 IEEE Electrical Insulation Conference (EIC)

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Abstract-The accumulation of charges on polymeric insulation under high voltage DC stress is a major concern in the transmission system as its formation distorts the local electric field and has an adverse impact on the electrical performance. By undergoing fluorination treatment on the insulation, improved surface properties similar to fluoropolymers can be attained without changing the bulk properties of the original material. The change in chemical components at the surface of polymeric insulation should lead to a corresponding change in electrical properties at the surface and thus can suppress charge build up. Previous research on surface flashover on fluorinated epoxy resin at atmospheric condition shows a significant improvement in flashover strength. In this paper, the authors investigated the effect of different degree of fluorination treatment on cast epoxy resin on suppressing surface charge accumulation and its contribution towards the improvement in surface breakdown strength. In comparison to previous research, it has been found that there is an optimum time duration of fluorination treatment which improves the surface breakdown strength of epoxy spacer. The mechanisms that govern the effect of fluorination treatment on surface flashover were discussed.

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“…The chamber also contained provisions for the collection of spectroscopic data, and the illumination of the surface by an external UV source. A more complete description of this apparatus can be found in literature [2]. …”

Section: A Unipolar Setupmentioning

confidence: 99%

“…Previous testing at Texas Tech University has shown the discharge formation to be highly dependent on the electric field geometry and the background gas [1,2]. Given an electric field that leads away from the surface, see Fig.…”

Section: A Arc Channel Formationmentioning

confidence: 99%

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Effects of UV illumination on surface flashover under pulsed unipolar excitation

Krile

Neuber

Krompholz

2007

2007 16th IEEE International Pulsed Power Conference

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Undesired surface flashover of high voltage support structure can severely limit the compactness of open air high voltage systems. Only recently, increased effort has been invested in characterizing and quantifying the physical processes involved in surface flashover occurring under atmospheric conditions and under the influence of UV illumination. Presently, UV flash lamps as well as a solid-state UV source, for their much faster turn-off times, are utilized in conjunction with a high temporal resolution testing apparatus. The UV pulse, voltage, current and flashover self luminosity will be measured with high temporal precision. A simple model that describes the observed behavior as well as a more advanced analysis utilizing a Monte Carlo type code for the electron collision dynamics will be presented.

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DC and pulsed dielectric surface flashover at atmospheric pressure

Cited by 40 publications

References 6 publications

Surface fluorinated epoxy resin for high voltage DC application

Surface fluorinated epoxy resin for high voltage DC application

Influence of fluorination time on surface flashover of epoxy in insulating gas

Effects of UV illumination on surface flashover under pulsed unipolar excitation

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