Investigation on Creeping Discharges Propagating over Insulators Immersed in Gases and Gas Mixtures Under Lightning Impulse Voltage

Coulibaly, Mamadou Lamine; Béroual, Abderrahmane; Aitken, O.; Girodet, A.

doi:10.1109/ichve.2008.4773864

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…The fact that the pressure acts on the discharge reducing their volume, the length and density of their branches indicates the influence of gaseous nature of discharges. The creeping discharges propagating over epoxy with moulding layer present a maximal extension (L f ) relatively higher than that measured with polytetrafluoroethylene filled with mineral fillers in the same experimental conditions [19]. It appears that, for a given voltage, there is a pressure for which any discharge can appear as we reported for solid/liquid interface [20 -22].…”

Section: Discussionmentioning

confidence: 58%

Investigation on creeping discharges propagating over epoxy resin and glass insulators in the presence of different gases and mixtures

Béroual

Coulibaly

Aitken

et al. 2011

Eur. Phys. J. Appl. Phys.

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This paper deals with the experimental characterization of discharges propagating over insulators of epoxy and glass, immersed in a gas or a gaseous mixture, under lightning impulse voltages (1.2/50 µs), using a point-plane electrode arrangement. The gases and mixtures we considered are SF 6 , N 2 , CO 2 , SF 6-N 2 and SF 6-CO 2. The morphology of creeping discharges and their final lengths are investigated versus the kind of insulator material, the amplitude and polarity of the voltage, the type of the gas (resp. mixture) and its pressure. It's shown that the shape of discharges and their final (stopping) lengths L f depend significantly on the solid insulator and the type of gas. For given solid and gas, L f increases quasi-linearly with the voltage and decreases when the gas pressure increases. The discharges don't always present a radial structure as reported in literature. For given voltage and pressure, L f is longer when the point electrode is positive than when it's negative while the initiation voltage of discharges is higher with a negative point than with a positive one; and L f is longer with glass than with epoxy. L f is shorter in SF 6 than in CO 2 or N 2. On the other hand, the increase of SF 6 content in SF 6-CO 2 mixture leads to a significant decrease of L f. Therefore the addition of small concentration of SF 6 in a given gas mixture improve the dielectric strength of insulating structure.

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Section: Discussionmentioning

confidence: 58%

Investigation on creeping discharges propagating over epoxy resin and glass insulators in the presence of different gases and mixtures

Béroual

Coulibaly

Aitken

et al. 2011

Eur. Phys. J. Appl. Phys.

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Ignition and advancement of surface discharges at atmospheric air under positive lightning impulse voltage depending on perpendicular electric stress and solid dielectrics: modelling of the propagating phenomenology

Douar

Béroual

Souche³

2018

Eur. Phys. J. Appl. Phys.

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In many high voltage equipment, partial discharges are regarded as one of the most widespread pathology whose ignition conditions and effects are studied by scientists and manufacturers to avoid major failures. Actually, those electrical gaseous phenomena generally occur under several constraints such as the electrostatic field level, the nature of insulating surface being polluted or not, and switching or lightning transients. The present paper discusses physical mechanisms related to the creeping discharges propagation growing over insulators subjected to perpendicular electric field and positive lightning impulse voltage. More precisely, the developed discussion attempts to answer some observations especially noticed for main discharges feature namely (i) the discharges morphology, (ii) their velocity and (iii) the space charges effects on electric field computation. Several factors like (i) the influence of the type of a material’s interface, its electric conductivity, permittivity and discharges mobility, (ii) the relationship between the applied electrostatic field, the space charges, the velocity, the propelling pressure and discharges temperature are among numerous parameters that have been addressed in this study which discusses lightning impulse transients phenomena.

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Study of creeping discharge on hardwood timber under AC and DC voltages

Zohdi

Wong

Rasara

et al. 2013

2013 Australasian Universities Power Engineering Conference (AUPEC)

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This paper studies creeping discharge on hardwood timber under AC and DC positive and negative voltages. Experiments have been carried out on hardwood timber which is commonly used as supporting structure for overhead power distribution lines. Differences between AC, DC positive and DC negative discharges are investigated. Creeping discharges developed on the surface of the hardwood timber are recorded using highly sensitive and low light camera and the surface area of the discharges developed under different voltages are quantified by computing the surface area of the discharges. In addition, the breakdown time of hardwood timber is measured. Effects of increasing voltage, capacitive effects of creeping discharge have been studied. The results show that the breakdown time of hardwood timber in DC positive voltage is shorter than DC negative and AC voltages. Capacitive effects on the breakdown time are also studied in this paper. These results provide new insights into the role of creeping discharges leading to the breakdown of hardwood timber and the subsequent burning of the timber.

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Investigation on Creeping Discharges Propagating over Insulators Immersed in Gases and Gas Mixtures Under Lightning Impulse Voltage

Cited by 4 publications

References 3 publications

Investigation on creeping discharges propagating over epoxy resin and glass insulators in the presence of different gases and mixtures

Investigation on creeping discharges propagating over epoxy resin and glass insulators in the presence of different gases and mixtures

Ignition and advancement of surface discharges at atmospheric air under positive lightning impulse voltage depending on perpendicular electric stress and solid dielectrics: modelling of the propagating phenomenology

Study of creeping discharge on hardwood timber under AC and DC voltages

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