Particle-Initiated Breakdown Between Coaxial Electrodes in Compressed SF6

Cookson, A.H.; Farish, O.

doi:10.1109/tpas.1973.293651

Cited by 105 publications

(22 citation statements)

References 6 publications

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“…The outer radius of the high voltage conductor and the inner radius of the cavity shell are R 1 =20 mm and R 2 =60 mm, respectively. Three valves are supplied for gas in and out, namely, vacuum, SF 6 charging, and SF 6 recovery valves. Moreover, the conductor is equipped with a pressure gauge.…”

Section: Experimental Platform and Test Methodsmentioning

confidence: 99%

“…The breakdown characteristic caused by free particles is explored under normal air ignoring the influence of SF 6 to determine the correlation between the air-gap breakdown and the motion behavior of particles. Particles of 2, 4, 8, and 12 mm in length and 0.1 mm in radius are adopted.…”

Section: Characteristic Of Air-gap Breakdown Caused By Free Wire Partmentioning

confidence: 99%

“…However, free-conducting particles can severely reduce insulation strength. In several cases, the rigidity of gases is as low as 10% of the uncontaminated value [4][5][6][7]. The insulation destruction of DC GIS/GIL caused by contaminated metal particles should be addressed more carefully than that of alternating current GIS/GIL because of an increased motion activity of such particles [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Studies on the Motion and Discharge Behavior of Free Conducting Wire Particle in DC GIL

Wang¹,

Wang²,

Ni³

et al. 2017

Journal of Electrical Engineering and Technology

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-This study aims to restrain free conducting wire-type particles which are commonly and dangerously existing within DC gas-insulated transmission lines. A realistic platform of a coaxial cylindrical electrode was established by using a high-speed camera and a partial discharge (PD) monitor to observe the motion, PD, and breakdown of these particles. The probabilities of standing or bouncing, which can be affected by the length of the particles, were also quantitatively examined. The corona images of the particles were recorded, and particle-triggered PD signals were monitored and extracted. Breakdown images were also obtained. The air-gap breakdown with the particles was subjected to mechanism analysis on the basis of stream theory. Results reveal that the lifting voltage of the wire particles is almost irrelevant to their length but is proportional to the square root of their radius. Short particles correspond to high bouncing probability. The intensity and frequency of PD and the micro-discharge gap increase as the length of the particles increases. The breakdown voltage decreases as the length of the particles decreases.

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Section: Experimental Platform and Test Methodsmentioning

confidence: 99%

Section: Characteristic Of Air-gap Breakdown Caused By Free Wire Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Studies on the Motion and Discharge Behavior of Free Conducting Wire Particle in DC GIL

Wang¹,

Wang²,

Ni³

et al. 2017

Journal of Electrical Engineering and Technology

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“…On levitation, the particle moves in the electrode gap, and when it comes in contact with the opposite electrode, a charge transfer between the particle and the metal electrode occurs by microdischarge-generating partial discharges [16]. Microdischarge originating at the spacer surface due to surface charging under high electric stresses can cause a major problem due to surface discharges leading to insulation Downloaded by [University of New Mexico] at 13:59 27 November 2014 flashover [17].…”

Section: Analysis Of Uhf Signal Magnitude Variation Due To Different mentioning

confidence: 99%

Identification of Partial Discharges in Gas-insulated Switchgear by Ultra-high-frequency Technique and Classification by Adopting Multi-class Support Vector Machines

Umamaheswari

Sarathi

2011

Electric Power Components and Systems

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Ultra-high-frequency signals are generated due to particle movement, floating conductors, corona, and surface discharges in gas-insulated switchgear. The ultra-high-frequency signal generated due to particle movement is independent of operating pressure and applied voltage. The bandwidth of the ultra-high-frequency signal formed due to corona and surface discharges vary with applied voltage. In a ternary plot, each type of discharge has a unique location. If a variety of discharge occurs simultaneously, it is difficult to classify the type of discharges through the ternary plot. It is demonstrated that the type of discharge can be classified efficiently by adopting a multi-class support vector machine.

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“…Research on discharge phenomena caused by particles inside GIS has been widely performed, focusing on breakdown initiated by particles [2][3][4], the firefly phenomenon [5,6], micro-gap discharge via particles located in proximity to the electrode [7], the characteristics of electric discharge via particles deposited on spacers [8][9][10], and movement of the particles around spacers [11]. Although discharge from a fixed needle electrode has been investigated in detail [12], there are few reports on the relationship between the movement of wire particles in an electric field and corona discharge occurring from the edges of particles.…”

Section: Introductionmentioning

confidence: 99%

Corona and micro‐gap discharge at a wire particle in precessional motion under a DC electric field

Kudo

Sugimoto

Higashiyama

2006

Electrical Engineering Japan

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SUMMARYA free wire particle located in an electric field between parallel plate electrodes manifests several motions: standing, precession on the electrode, crossing, and breakdown via the particle. During stable standing or precessional motion, the corona discharge inevitably occurs. To clarify the influence of discharge phenomenon on the behavior of the wire particle, the corona discharge characteristic of the particle in the precession was investigated experimentally in a DC electric field formed by parallel plate electrodes with a positive voltage applied to the upper electrode. The waveforms of the corona discharge current flowing through a 6-mm wire particle were measured under two conditions: when a free wire was in precession on the lower electrode and when a wire was fixed between the electrodes vertically with a spacing of less than 1 mm between the lower electrode and the bottom of the particle. From a comparison of the waveform of corona discharge occurring at the particle in precession with that of the fixed particle, it was found that both micro-gap discharge and negative corona occurred simultaneously only when the particle was in precession with a relatively small elevation angle. The particle was lifted up when the magnitude of the corona discharge current was decreased below about 15 µA.

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Particle-Initiated Breakdown Between Coaxial Electrodes in Compressed SF6

Cited by 105 publications

References 6 publications

Experimental Studies on the Motion and Discharge Behavior of Free Conducting Wire Particle in DC GIL

Experimental Studies on the Motion and Discharge Behavior of Free Conducting Wire Particle in DC GIL

Identification of Partial Discharges in Gas-insulated Switchgear by Ultra-high-frequency Technique and Classification by Adopting Multi-class Support Vector Machines

Corona and micro‐gap discharge at a wire particle in precessional motion under a DC electric field

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