Breakdown of Rod-Plane Gaps in SF<sub>6</sub> Under Positive Switching Impulses

Anis,; Srivastava,

doi:10.1109/mper.1982.5520310

Cited by 7 publications

(3 citation statements)

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“…Although the amplitude of VFTO is not high, no more than 3 p.u., it might result in insulation failures inside or outside GIS. Breakdown researches on GIS under VFTO began in the early 1980s [3][4][5][6][7][8]. However, most of them focused on gas discharge, and a few paid attentions to spacer flashover, which were the main reason causing failures of insulating system in the sight of operational experiences.…”

Section: Introductionmentioning

confidence: 99%

Spacer flashover characteristics in SF<inf>6</inf> under repetitive nanosecond-pulses

Ran¹,

Wang²,

Wang³

et al. 2012

2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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Very Fast Transient Overvoltages (VFTO) might result in insulation failures inside or outside Gas Insulated Switchgears (GIS), and most of them are led to by the spacer flashovers in the light of operational experiences. To get a better understanding of the discharge process, an experimental study on spacer flashovers under nanosecond-pulses in compressed Sulphur Hexafluoride (SF 6 ) gases is presented. A solid-state pulse generator, SPG200N, is used to generate nanosecond-pulses with a rise time of 15 ns and a full width at half maximum of 30-40 ns. The pulse repetition frequency (PRF) varies from 1 Hz to 1 kHz. The material of spacer is epoxy resin, a common material as insulators in GIS. The test electrodes are brass parallel-plane electrodes, 80 mm in diameter, to simulate uniform field in GIS. In this research, the relations of flashover time lag with gas pressure and PRF are investigated. The experimental results show that the flashover time lag gradually rose with the increase of gas pressure under single shot and lower PRF.

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Section: Introductionmentioning

confidence: 99%

Spacer flashover characteristics in SF<inf>6</inf> under repetitive nanosecond-pulses

Ran¹,

Wang²,

Wang³

et al. 2012

2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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“…In pure N 2 , the possibility of the presence of electrons is much lower than in N 2 /SF 6 gas mixtures. Furthermore, the electric field at the upper needle electrode is relaxed by accumulated charges on the barrier resulting from initial corona generation [13], so that the corona extension length is reduced and the flashover voltage is increased. As reported previously [12], the corona in N 2 extended farther than the corona at D = 3%.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of N₂/SF₆ mixture gas in creeping discharge developing in narrow gap with backside electrode

Hirata

Ueno

Nakayama

2006

Electrical Engineering Japan

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SUMMARYThe flashover voltage with a backside electrode was found to be lower than that without the backside electrode. Under microsecond pulse voltage application, we describe the characteristics of a creeping discharge developed in the narrow gap with the backside electrode. Using a CCD camera and ultrahigh-speed camera, we observed the corona extension processes. The lowest flashover voltage was found to be obtained at positive polarity with a SF 6 content D = 3%. In the corona extension obtained using an ultrahigh-speed camera, peculiar differences were observed in the corona extension process. The corona extension increased, and rapid flashover was observed at D = 3%. Using a CCD camera, small coronas were detected from the backside electrode.

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“…The advantages of SF 6 gas over air for DC, 50/60 Hz are well known in the electric power industry [2][3][4][5][6][7][8][9][10][11][12][13][14]. Dielectric properties of SF 6 at high frequency (HF) in MHz range have also been investigated [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Breakdown voltage of compressed SF₆ at very low frequency/low frequency (VLF/LF)

Han

Gorur

Hansen

2010

Int Trans Elec Energy Syst

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SUMMARY The breakdown voltage (BDV) of compressed sulfur hexafluoride (SF6) in the pressure range of 1–5 atm at 30 kHz, the frequency used by Navy for communications with vessels, is presented. Experiments were conducted in both uniform field (plane–plane gap) and non‐uniform field (rod–plane gap). The impact of pressure on the BDV is quantitatively analyzed. The pressure correction factors for calculating the BDV of SF6 at 30 kHz have been developed from knowledge of breakdown characteristics of air and from regression models. Copyright © 2010 John Wiley & Sons, Ltd.

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Breakdown of Rod-Plane Gaps in SF₆ Under Positive Switching Impulses

Cited by 7 publications

References 0 publications

Spacer flashover characteristics in SF<inf>6</inf> under repetitive nanosecond-pulses

Spacer flashover characteristics in SF<inf>6</inf> under repetitive nanosecond-pulses

Characteristics of N₂/SF₆ mixture gas in creeping discharge developing in narrow gap with backside electrode

Breakdown voltage of compressed SF₆ at very low frequency/low frequency (VLF/LF)

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Breakdown of Rod-Plane Gaps in SF6 Under Positive Switching Impulses

Cited by 7 publications

References 0 publications

Spacer flashover characteristics in SF<inf>6</inf> under repetitive nanosecond-pulses

Spacer flashover characteristics in SF<inf>6</inf> under repetitive nanosecond-pulses

Characteristics of N2/SF6 mixture gas in creeping discharge developing in narrow gap with backside electrode

Breakdown voltage of compressed SF6 at very low frequency/low frequency (VLF/LF)

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Breakdown of Rod-Plane Gaps in SF₆ Under Positive Switching Impulses

Characteristics of N₂/SF₆ mixture gas in creeping discharge developing in narrow gap with backside electrode

Breakdown voltage of compressed SF₆ at very low frequency/low frequency (VLF/LF)