Avalanche breakdown in n-hexane

Arii, Kiyomitsu; Kitani, Susumu; Kawamura, Masamitsu

doi:10.1088/0022-3727/12/5/020

Cited by 27 publications

(10 citation statements)

References 25 publications

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“…The breakdown process normally takes several microseconds in these models. However, a micro-EDM RC pulse discharge generally takes only hundreds of nanoseconds and the expansion velocity of the discharge channel is 10 4~1 0 5 m/s in the liquid [20,21]. Therefore, the expansion mechanism simply based on the bubble dynamics is insufficient to explain the rapid discharge in micro-EDM.…”

Section: Plasma Breakdown Stagementioning

confidence: 99%

“…Due to its complex composition, it is difficult to determine the thermal and physical properties of kerosene. Therefore, alkanes that are the main composition of the kerosene are selected to replace kerosene in the calculation [21]. Discharge parameters used in the calculation are 10000pF discharge capacity, 1μm discharge gap, and 60V discharge voltage.…”

Section: The Calculation Of Plasma Modelmentioning

confidence: 99%

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A Study on Plasma Channel Expansion in Micro-EDM

Chu

Zhu

Wang

et al. 2015

Materials and Manufacturing Processes

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Micro-EDM is derived from traditional EDM (electrical discharge machining), and widely used in the micro fabrication field. By using narrow-width pulse power generators, micro-EDM can be applied to machining work with smaller gaps and at low energy levels, which demonstrates a different electro-discharge process and material erosion characteristics, compared with traditional EDM. Through in-depth study on micro-EDM and MHD (magnetic fluid dynamics), a comprehensive plasma model has been established consisting of the breakdown and the expansion stages. In addition, theoretical calculation based on the model is performed, followed by results analysis. Finally, micro-EDM experiments are conducted to verify the feasibility of the model and the correctness of the results analysis.

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Section: Plasma Breakdown Stagementioning

confidence: 99%

Section: The Calculation Of Plasma Modelmentioning

confidence: 99%

A Study on Plasma Channel Expansion in Micro-EDM

Chu

Zhu

Wang

et al. 2015

Materials and Manufacturing Processes

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“…As well known, two kinds of initiation mechanism of streamer discharges in dielectric liquids have been proposed, so called bubble process and electronic process [10]. If the electronic process is a dominant factor of the streamer initiation, the initiation probability per unit time is kept constant at any time because the process is based on the stochastic mechanism such as avalanche breakdown [17]. If the bubble process is a dominant factor for the streamer initiation, the streamer discharge takes place after the physical processes for the formation of micro bubbles produced by Joule heating due to current concentration near the point electrode, so that the plot of the initiation time lag is kept flat at the initial stage of the voltage application.…”

Section: Initiation Processmentioning

confidence: 99%

Space charge effect for streamer initiation and propagation in water subjected to reciprocal traveling wave voltage pulse

Kadowaki

Nishimoto

Kitani

2006

IEEE Trans. Dielect. Electr. Insul.

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This paper deals with initiation and propagation processes of streamer discharges in water subjected to high-speed repetitive voltage pulse. The 50%-duty repetitive pulses were produced by the reciprocal traveling wave in a pulse forming cable which was connected with a point-plane electrode gap in a water-cell. Laue plot of time lag distributions for the streamer initiation indicated that the initiation probability during the second pulse application became much higher than that during the first pulse application. We concluded that the change in space charges distribution due to internal field during the rest-time after the first pulse enhanced the streamer initiation probability at the second pulse application. Temporal development in the positive streamers during the repetitive pulse application was observed using a gated image intensifier. When the pulse was relatively high, the streamer discharges started the propagation at the first pulse and then the discharge channel became long step by step at the subsequent pulse applications. It was also found that the periodical emission due to excitation of OH radicals was detected for a long period after the development of the streamer discharge in a spectroscopic measurement.

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“…The dielectric properties of LNG are difficult to be obtained through conventional high-voltage (HV) tests . Fortunately, n -hexane is a hydrocarbon whose electrical properties are well studied and has some similarities to the molecules that make up LNG. , In addition, n -hexane electrical test and simulation research are in good agreement . Moreover, some calculated values showed that the breakdown field strength of liquid methane (LCH 4 ) is much lower than that of other cryogenic liquids, so LNG (methane as the main component) seems to be unsuitable as an insulating medium .…”

Section: Introductionmentioning

confidence: 99%

Liquefied Natural Gas for Superconducting Energy Pipelines: A Feasibility Study on Electrical Insulation

et al. 2021

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A superconducting energy pipeline is an integrated system for fuel delivery and power transmission. In the energy pipeline, direct current (DC) power is carried by superconducting tapes with almost no loss. Moreover, liquefied natural gas (LNG) is used not only as one kind of clean energy but also as a cooling medium. However, the lack of data on the electrical insulation characteristics of LNG (especially the resistance to breakdown and flashover) restricts the development of a superconducting energy pipeline. Therefore, this paper focuses on solving a series of problems (such as gas tightness, overpressure, and high voltage) in LNG insulation testing, obtaining the electrical failure data of multicomponent LNG, and analyzing the behavior of electric breakdown and flashover in LNG. The test results show that LNG as a dielectric cooling medium has remarkable performance in withstand voltage to replace the liquid nitrogen/liquid tetrafluoromethane (LN2/LCF4) binary mixtures. The research could offer key technical support for the superconducting energy pipeline and also provide a reference for the study of electrical properties on other cryogenic fuels.

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Avalanche breakdown in n-hexane

Cited by 27 publications

References 25 publications

A Study on Plasma Channel Expansion in Micro-EDM

A Study on Plasma Channel Expansion in Micro-EDM

Space charge effect for streamer initiation and propagation in water subjected to reciprocal traveling wave voltage pulse

Liquefied Natural Gas for Superconducting Energy Pipelines: A Feasibility Study on Electrical Insulation

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