Prebreakdown Phenomena in Liquid Dielectrics

Béroual, Abderrahmane; Tobazéon, R.

doi:10.1109/tei.1986.348967

Cited by 158 publications

(47 citation statements)

References 24 publications

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“…Bubble instability [23], dynamics [24] and transition to streamers [17,23] has been the subject of much research efforts and various models have been proposed to evaluate the velocities of streamers [13,24-261. The oscillograms in the Figures show that for tetraester, transformer oil and cyclohexane under low voltages, individual bubbles are formed one after the other and there is no transition to a streamer regime.…”

Section: Resultsmentioning

confidence: 99%

The dynamics of DC predisruption in liquid insulating media

Briggs

Béroual

Buret

1994

IEEE Trans. Dielect. Electr. Insul.

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Results of predisruptive current, light and electrical charge measurements are presented for the liquids tetraester, transformer oil and cyclohexane, under point-plane electrode arrangements with negative and positive high dc voltages. Observed current and light pulses existed both in the kHz and the MHz frequency ranges for both polarities of the point electrode. The electrical charge for the current pulses either increased or decreased sharply whenever these pulses occurred. In general, three pulse regimes were evident: (1) current pulses with no associated light pulses, (2) current pulses correlated with light pulses and (3) light pulses with no associated current pulses. Analysis of the results obtained suggests the occurrence of charge injection followed by processes of bubble formation and electronic avalanche multiplication in the liquid phase, and partial discharges in localized expanding bubbles. The steplike propagation of streamers is explained and streamer velocities were estimated. Involvement of both electronic and gaseous phenomena in predisruptive processes is also suggested.

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Section: Resultsmentioning

confidence: 99%

The dynamics of DC predisruption in liquid insulating media

Briggs

Béroual

Buret

1994

IEEE Trans. Dielect. Electr. Insul.

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“…Figure 1 shows the dierent shapes of current, observed in mineral oil under dierent voltages for the same geometry of electrodes. [10,11]. Current pulses whose amplitude decreases with the applied voltage are superimposed on this continuous component.…”

Section: Current Shapesmentioning

confidence: 99%

Discharge Currents Discrimination Technique Based on Multi-Linear Regression Line and Artificial Neural Networks for Power Transformers Diagnosis

et al. 2013

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The proposed work will be consecrated to the study of positive pre-breakdown currents triggered in mineral transformer oil under 50 Hz alternating overvoltage. Since negative currents are recorded in low rates and for higher voltage levels than positive ones, only the latter will be prior taken into consideration. Both streamer propagation and arc discharge current types are identied and are used in the training process of an articial neural network and the multi-linear regression line of these currents in order to develop a complementary diagnosis tool that can serve as an on-line transformer protection. More successful results than those obtained by other developed techniques are expected.

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“…Beroual and R. Tobazeon, remark that the positive streamer velocity is much higher than the negative one and the positive streamers are more filamentary than the negative streamers [6]. A model considers the streamer as an extension of the point (the tip of the pin in pin-plane geometry) was proposed by Chadband [7].…”

Section: Evaluation Of Streamer Velocitymentioning

confidence: 99%

“…For the case of unique filament model, it was got on equating kinetic energy to electrostatic energy. Then the streamer velocity is [6] 1) where and are the permittivity and mass per unit volume of the liquid. is the electric field strength at the tip of the streamer and it was given [6] as…”

Section: Evaluation Of Streamer Velocitymentioning

confidence: 99%

The Velocity and Initiation Time for the Streamer Discharge with in Dielectric Liquids

Khalaf¹

2013

JNUS

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Dielectric liquids are widely used in high voltage equipments such as transformers. This study reports the computational results for some parameters that affect the initiation time and velocity of the streamer discharge within some dielectric liquids between pin-plane electrodes. Finite element technique was used to indicate the electric field distribution within a dielectric liquids. Results show clearly that, the applied voltage and the liquid permittivity affect (increasing or decreasing) the values of the initiation time and the velocity of the streamer.

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Prebreakdown Phenomena in Liquid Dielectrics

Cited by 158 publications

References 24 publications

The dynamics of DC predisruption in liquid insulating media

The dynamics of DC predisruption in liquid insulating media

Discharge Currents Discrimination Technique Based on Multi-Linear Regression Line and Artificial Neural Networks for Power Transformers Diagnosis

The Velocity and Initiation Time for the Streamer Discharge with in Dielectric Liquids

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