Behavior of an oil-paper interface in presence of carbon particle contamination

Vincent, Claire; Trinh, N. Giao; Olivier, R.; Aubin, J.

doi:10.1109/elinsl.1994.401400

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Once mixed into the oil, the sludge acts as drifting space charge. Studies conducted on AC breakdown behavior of oil with carbon particle contamination have shown that carbon particles act as positive space charge in oil [32]. The homogenization of sludge in the oil effectively reduces the gap distance between the electrodes which reduces the charge magnitudes of streamers.…”

Section: Relevant Pd Parametersmentioning

confidence: 99%

Partial discharge based diagnostics for impurities in insulating fluid

Bolliger

Boggs

2013

IEEE Trans. Dielect. Electr. Insul.

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A novel test method for the condition assessment of dielectric fluids is proposed based on measurement of the fluid's partial discharge (PD) characteristics in a needle-plane electrode geometry under AC field using a tungsten needle of 20 m tip radius and a lowfield electrode blocked by a dielectric barrier. This system facilitates acquisition of partial discharge inception voltage (PDIV), streamer repetition rates, and phase resolved PD (PRPD) patterns without the risk of needle-damaging breakdowns. To demonstrate the approach, PD experiments were conducted on thermally and electrically aged hexadecane and on commercially available paraffinic and naphthenic base oils with typical field-aged concentrations of naturally occurring degradation products.

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Section: Relevant Pd Parametersmentioning

confidence: 99%

Partial discharge based diagnostics for impurities in insulating fluid

Bolliger

Boggs

2013

IEEE Trans. Dielect. Electr. Insul.

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“…Moreover, copper particles and air bubbles in oil trigger a higher creeping discharge of the oil-paper insulation (Thirumurugan et al, 2019). An experimental study on the effects of carbon particles on the characteristics of AC discharge of insulating paper found that carbon particles influence the development of creeping discharge of the insulating cardboard (Vincent et al, 1994). However, few studies have examined the effects of carbon particles on the properties of oil-paper insulation under a DC electric field.…”

Section: Open Accessmentioning

confidence: 99%

Investigating the growth of carbon traces in cardboard in oil-paper insulation

Zhang

Pan²,

Dong³

et al. 2023

Front. Energy Res.

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A large amount of contaminants are collected on the cardboard surface of the valve-side bushing outlet of a converter transformer that has been operating for a long period, and can cause the performance of the oil–paper insulation to degrade. The analysis of their energy spectrum has shown that these contaminants contain free carbon. To investigate causes of the formation of these carbon traces, the authors of this study analyze their law of growth on the surface of the insulating paper in the presence of pure insulating oil and insulating oil containing carbon particles. We examined the influence of carbon tracks of different lengths on the breakdown voltage along the surface of the oil–paper insulation. The results showed that carbonization on the surface of the insulating paper generated carbon traces in pure insulating oil and eventually led to the formation of conductive channels. Moreover, carbon traces were generated by carbon particles deposited on the surface of the insulating paper in insulating oil containing carbon particles. The carbon traces grew from the high-voltage electrode to the ground electrode along the direction of the electric field in both types of oils. The formation of the conductive channel through the poles of the paper in insulating oil containing carbon particles required a lower voltage and a shorter discharge time than that in pure insulating oil. As the concentration of the carbon particles increased, the rate of growth of carbon traces on the surface of the insulating paper increased such that the oil–paper insulation failed earlier than otherwise. Long carbon traces were formed on the surface of the insulating paper in case of a high concentration of carbon particles under the DC pre-pressure mode, and this led to a reduction in the breakdown voltage along the surface of the oil–paper insulation.

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Impact of carbon particles on the impulse flashover behavior of different solid/liquid interfaces in a non-uniform field

Krins

Borsi²,

Gockenbach³

Proceedings of 1998 International Symposium on Electrical Insulating Materials. 1998 Asian International Conference on Dielectr

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This paper reports on experimental investigations dealing with the influence of carbon particles on the lightning impulse flashover behavior of the interface between insulating rods of different permittivities and surface structures and transformer oil in a non-uniform electrical field. The results reveal that for negative lightning impulse stress carbon particles in the oil act as defects due to their positive polarity and thus reduce the breakdown and flashover strength of all investigated materials distinctly. For positive impulse polarity no significant detrimental impact of the carbon particles on the electrical strength can be made out. Furthermore the contribution displays that in clean oil as well as in carbonized oil the probability of a surface tracking is for all investigated spacer materials markedly lower at positive impulse polarity than at negative lightning impulse stress.

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Behavior of an oil-paper interface in presence of carbon particle contamination

Cited by 3 publications

References 5 publications

Partial discharge based diagnostics for impurities in insulating fluid

Partial discharge based diagnostics for impurities in insulating fluid

Investigating the growth of carbon traces in cardboard in oil-paper insulation

Impact of carbon particles on the impulse flashover behavior of different solid/liquid interfaces in a non-uniform field

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