Creepage discharge propagation in air and SF/sub 6/ gas influenced by surface charge on solid dielectrics

Ōkubo, H.; Kanegami, M.; Hikita, Masayuki; Kito, Yukio

doi:10.1109/94.300262

Cited by 23 publications

(14 citation statements)

References 10 publications

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“…In our previous reports [11][12][13], we have already shown that the impulse creepage discharges along the charged surface under a potential of 2 to 3 kV extended a distance which was maximum 6 times that for the uncharged surface. We also discussed the relationship between the specific capacitance and the flashover voltage, and the effect of surface charge on creepage discharges in terms of the mean discharge propagation velocity, which was estimated from observation of discharge current.…”

Section: Membermentioning

confidence: 87%

Creepage Discharge Propagation on Charged Dielectric Surface in SF<sub>6</sub> Gas and Its Optical Observation

et al. 1995

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Section: Membermentioning

confidence: 87%

Creepage Discharge Propagation on Charged Dielectric Surface in SF<sub>6</sub> Gas and Its Optical Observation

et al. 1995

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“…Fundamental studies have been conducted to understand the inception and (insulator shape, electrodes form…), etc. Fundamental studies have been conducted to understand the inception and propagation of creeping discharges in various gases [7][8][9][10][11][12][13][14]. It appears from the reported results that the phenomena start with corona discharges that evolves into ramified streamers.…”

Section: Review Of Surface Discharges and Flashover Models In Gasesmentioning

confidence: 99%

Surface Discharges and Flashover Modelling of Solid Insulators in Gases

2020

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The aim of this paper is the presentation of an analytical model of insulator flashover and its application for air at atmospheric pressure and pressurized SF6 (Sulfur Hexafluoride). After a review of the main existing models in air and compressed gases, a relationship of flashover voltage based on an electrical equivalent circuit and the thermal properties of the discharge is developed. The model includes the discharge resistance, the insulator impedance and the gas interface impedance. The application of this model to a cylindrical resin-epoxy insulator in air medium and SF6 gas with different pressures gives results close to the experimental measurements.

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“…•¬ (1) •¬ (2) where V denotes the applied voltage, a the radius of the central line and b the radius of the insulated sample wire. The electric field strength E (b) and potential V (b) at the test wire surface can be calculated by putting x=b in Eqs.…”

Section: Setup and Proceduresmentioning

confidence: 99%

“…The electric field strength E (b) and potential V (b) at the test wire surface can be calculated by putting x=b in Eqs. (1) and (2). E (b) increases exponentially with decreasing h (e. g., in V=70kV, E (b)=24kV/cm for h=500mm and E (b) =52kV/cm for h=30mm).…”

Section: Setup and Proceduresmentioning

confidence: 99%

“…The process of electrical breakdown has been studied extensively for various insulating materials by many researchers and its mechanism is well understood. Many studies on creeping discharge in gases such as air and SF6 have used a Lichtenberg figure, a high-speed camera, etc., to record streamer propagation [1,2]. Sev eral researchers have also studied the electrical charac teristics of creeping streamers along the surface of solid insulators in insulating oil [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Creeping Impulse Streamers over the Surface of Oil-Immersed PE Wire

1996

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Creeping impulse discharges occurring at the insulating systems of electric power equipment are significantly af fected by the presence of a surrounding grounded metal case. Using a standard lightning impulse voltage, the char acteristics of creeping streamers were studied over the surface of an oil-immersed polyethylene (PE) insulated wire with a grounded side electrode. The discharge characteristics (discharge aspect, streamer extension length, streamer current and charge, etc.) were measured as a function of the distance between the PE wire and the grounded side electrode. Streamer polarity and the position of the side electrode significantly affected both streamer generation and propagation. The creepage characteristics were also examined using two methods of voltage application. Differences in the test results of each method were attributed to the position of the side electrode. The potential distribution inside the streamer channel and the streamer propagation velocity were measured by means of a potential probe. Streamer velocity was found to be constant and the streamer channel was not equipotential.

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Creepage discharge propagation in air and SF/sub 6/ gas influenced by surface charge on solid dielectrics

Cited by 23 publications

References 10 publications

Creepage Discharge Propagation on Charged Dielectric Surface in SF<sub>6</sub> Gas and Its Optical Observation

Creepage Discharge Propagation on Charged Dielectric Surface in SF<sub>6</sub> Gas and Its Optical Observation

Surface Discharges and Flashover Modelling of Solid Insulators in Gases

Characteristics of Creeping Impulse Streamers over the Surface of Oil-Immersed PE Wire

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