The Dynamics of Electrical Breakdown in Liquid Hydrocarbons

Wong, P. P.; Forster, E. O.

doi:10.1109/tei.1982.298458

Cited by 62 publications

(24 citation statements)

References 6 publications

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“…This light emission was thought to be due to dissociation of fluid molecules, to excitation and to ionization in the liquid. Wong and Forster studied light emission in n-hexane under lightning impulse voltage (1 to 50 ps) [14]. They observed atomic and molecular H species, carbon molecules (Cz and C,) and related this light emission to hot electron processes, similar to that observed in gas discharges.…”

Section: Spectral Analysis Of Light Emission Associated W I T H T H Ementioning

confidence: 83%

Optical investigation of high-field conduction and prebreakdown in a dielectric liquid

Brosseau¹,

Béroual²

1994

IEEE Trans. Dielect. Electr. Insul.

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Light emission studies of the ,high-field conduction and prebreakdown phenomena in a mixture of mono and dibenzyltoluene (M/DBT), used as polypropylene impregnant in the all-film capacitor technology, have been undertaken t o gain insight into the underlying physical mechanisms responsible for these processes. The absorption spectrum of this fluid, in the U V region, shows the appearance of structured bands at 348, 366 and 386 nm indicating a luminescence process via anthracene and 9-met hylant hracene impurities at a concentration of 3~1 0 -~ mol/l. Optical and electrical measurements were performed simultaneously on the electrically stressed fluid. Electroluminescence of the impurities contained in M/DBT has been investigated using a new uniform field electrode arrangement. The light inception stress was determined t o be -20 Vpm-' for ac excitation (50 Hz). Configurations with different interfacial situations were studied and we have evidenced a correlation between charge injection and electroluminescence activity. Spectral analysis of the light radiated by streamers in M/DBT in a needle-plane electrode geometry, under step voltage (1 t o 50 ps, 30 kV) revealed, for both polarities, the presence of H1 and Ca characteristic bands emerging from a continuum corresponding to the dissociation and recombination of molecular fragments.

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Section: Spectral Analysis Of Light Emission Associated W I T H T H Ementioning

confidence: 83%

Optical investigation of high-field conduction and prebreakdown in a dielectric liquid

Brosseau¹,

Béroual²

1994

IEEE Trans. Dielect. Electr. Insul.

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“…In chlorinated liquids, the temperature was estimated using the broadening of the C 2 carbon radical emission bands [25] and was found to range from 2 × 10 3 to 6 × 10 3 K. Others researchers have noted that the temperature in the filaments is certainly high enough to cause strong pitting on metallic electrodes. The atomic emission from metals evaporated from the electrodes could also be found in the analyzed spectra [20].…”

Section: Composition Of Streamersmentioning

confidence: 93%

“…As is widely known electrical breakdown is often associated with light emission, and it is possible to learn much from analyzing that emitted light in greater detail [20]. A spectrum of radiation released from a breakdown arc is shown in Figure 6.…”

Section: Composition Of Streamersmentioning

confidence: 99%

Electrical breakdown in dielectric liquids-a short overview

Wedin

2014

IEEE Electr. Insul. Mag.

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“…Despite a large body of experimental observations, there is still no comprehensive understanding of the inherent breakdown physics. [22][23][24] For relatively long-voltage pulse durations of microseconds or higher, two competing theories of liquid breakdown in water have emerged: (i) A bubble-initiated breakdown process and (ii) an electronic impact-ionization process. Also, in contrast to gases, the molecular density is much higher, which significantly enhances the collective clustering effects and formation of trimers, tetramers, and pentamers.…”

Section: Introductionmentioning

confidence: 99%

Are microbubbles necessary for the breakdown of liquid water subjected to a submicrosecond pulse?

Joshi

Qian

Zhao

et al. 2004

Journal of Applied Physics

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Microbubble-based model analysis of liquid breakdown initiation by a submicrosecond pulse J. Appl. Phys. 97, 113304 (2005); 10.1063/1.1921338 Breakdown threshold and localized electron density in water induced by ultrashort laser pulses Electrical breakdown in homogeneous liquid water for an ϳ100 ns voltage pulse is analyzed. It is shown that electron-impact ionization is not likely to be important and could only be operative for low-density situations or possibly under optical excitation. Simulation results also indicate that field ionization of liquid water can lead to a liquid breakdown provided the ionization energies were very low in the order of 2.3 eV. Under such conditions, an electric-field collapse at the anode and plasma propagation toward the cathode, with minimal physical charge transport, is predicted. However, the low, unphysical ionization energies necessary for matching the observed current and experimental breakdown delays of ϳ70 ns precludes this mechanism. Also, an ionization within the liquid cannot explain the polarity dependence nor the stochastic-dendritic optical emission structures seen experimentally. It is argued here that electron-impact ionization within randomly located microbubbles is most likely to be responsible for the collective liquid breakdown behaviors.

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The Dynamics of Electrical Breakdown in Liquid Hydrocarbons

Cited by 62 publications

References 6 publications

Optical investigation of high-field conduction and prebreakdown in a dielectric liquid

Optical investigation of high-field conduction and prebreakdown in a dielectric liquid

Electrical breakdown in dielectric liquids-a short overview

Are microbubbles necessary for the breakdown of liquid water subjected to a submicrosecond pulse?

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