A new model for the primary process of electrical breakdown in liquids

Lewis, T. J.

doi:10.1109/94.689419

Cited by 82 publications

(49 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Light emission may be expected to occur, being produced both in the bond breaking processes and also from molecular excitations accompanying the electron acceleration in the electric field. The cathode-directed streamer corona propagation from the anode arises from the creation of a new liquid/air interface and the reilluminations observed in the streamer do not have conductive properties, and are not necessarily connected back to the anode [9]. Also, the difference between the critical streamer corona initiation voltage and the electrical breakdown voltage increases with decreased water resistivity.…”

Section: Characteristics Of Streamer Dischargesmentioning

confidence: 99%

“…An electron avalanche can occur immediately in water under a high electric field, leading to the propagation of the water streamer [7]. Streamer corona initiation and propagation mechanisms in some liquids have been reported, two models for streamer corona initiation are considered: one is the electronic process, which involves electron injection drift in the liquid at the cathode, the other covering the concept of microbubble formation due to vaporization and/or cavitation and electrical breakdown in the gas bubbles [8], [9]. Fig.…”

Section: Characteristics Of Streamer Dischargesmentioning

confidence: 99%

See 1 more Smart Citation

Electrical Properties Associated with Discharge Developments in Water Subjected to Impulse Voltages

Choi¹,

Lee²

2010

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-This paper describes electrical and optical characteristics of discharge developments in water under inhomogeneous fields caused by impulse voltages. Predischarge current and discharge light images were observed for different water resistivities and applied voltages between the hemispherical water tank and the needle electrode. The electrical parameters characterizing discharge developments are analyzed based on the discharge light images and voltage-current (V-I) curves, and electrical resistances derived by voltage and current waveforms. As a result, when the streamer corona is initiated at the tip of the needle electrode, the transient resistance suddenly drops and V-I curves form a 'loop'. The length of streamer propagation is increased with increasing peak value of the applied voltage, and the streamer corona extension is enlarged with increasing water resistivity. The electrical resistances before streamer corona initiation are rarely changed by different applied voltages. On the other hand, the electrical resistances after streamer corona initiation are found to be inversely proportional to the peak value of the applied voltage, and the decreasing rates for higher water resistivities are much higher than those for lower water resistivities. The time to streamer corona initiation and the time to the second current peak become shorter as the voltage increases. Finally, the calculated resistances after streamer corona initiation are almost the same trace of measured resistances, but they are smaller than the measured values.

show abstract

Section: Characteristics Of Streamer Dischargesmentioning

confidence: 99%

Section: Characteristics Of Streamer Dischargesmentioning

confidence: 99%

Electrical Properties Associated with Discharge Developments in Water Subjected to Impulse Voltages

Choi¹,

Lee²

2010

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

show abstract

“…The electric field around the tip of the needle electrode, or the streamer channel, is highly increased, which causes an intense field emission current that eventually vaporizes the water. Also, the very high electric field causes a cavity due to the electromechanical stress, which is proportional to the square of the electric field strength [9], [13].…”

Section: Pre-breakdown Development Processesmentioning

confidence: 99%

Underwater Discharge Phenomena in Inhomogeneous Electric Fields Caused by Impulse Voltages

Lee¹,

Kim²,

Choi³

2010

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-The paper describes the electrical and optical properties of underwater discharges in highly inhomogeneous electric fields caused by 1.2/50 ㎲ impulse voltages as functions of the polarity and amplitude of the applied voltage, and various water conductivities. The electric fields are formed by a point-to-plane electrode system. The formation of air bubbles is associated with a thermal process of the water located at the tip of the needle electrode, and streamer coronas can be initiated in the air bubbles and propagated through the test gap with stepped leaders. The fastest streamer channel experiences the final jump across the test gap. The negative streamer channels not only have more branches but are also more widely spread out than the positive streamer channels. The propagation velocity of the positive streamer is much faster than that of the negative one and, in fact, both these velocities are independent of the water conductivity; in addition the time-lag to breakdown is insensitive to water conductivity. The higher the water conductivity the larger the pre-breakdown energy, therefore, the ionic currents do not contribute to the initiation and propagation of the underwater discharges in the test conditions considered.

show abstract

“…Even when fields of much longer duration have heen employed, optical techniques have shown that a lowdensity cavity (or bubble) is generated at an electrode within no more than a few microseconds. Local heating of the liquid by intense field-aided elecbron emission from a cathode or perhaps by ionic currents bas been suggested as the cause [5,6].…”

Section: Introductionmentioning

confidence: 99%

The electrode-liquid interface under high fields

Lewis

Proceedings of 2002 IEEE 14th International Conference on Dielectric Liquids. ICDL 2002 (Cat. No.02CH37319)

Self Cite

View full text Add to dashboard Cite

Ab@&The mechanism which occur at the interfaces between insulating liquids and metal electrodeJ and are significant for the initiation of electrical b r e s k d m under high &Ids are eonsidered. These indude not only ekctmnic processes but also bydmmecbanical ones involving the Iippmann effect in which the electrical &Ids of the double layers at the electrodes reduce the interfacial tension and lead to the genetation of low pressum microSavitieJ. It ia snggested that the crmpling of this mechanical mechanism to emcient electron transfer by Auger processes at the electrodes wiU be highly conducive to streamer initiation.

show abstract

A new model for the primary process of electrical breakdown in liquids

Cited by 82 publications

References 29 publications

Electrical Properties Associated with Discharge Developments in Water Subjected to Impulse Voltages

Electrical Properties Associated with Discharge Developments in Water Subjected to Impulse Voltages

Underwater Discharge Phenomena in Inhomogeneous Electric Fields Caused by Impulse Voltages

The electrode-liquid interface under high fields

Contact Info

Product

Resources

About