Particles and breakdown in SF6– insulated apparatus

Banford, H.M.

doi:10.1049/piee.1976.0187

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…The gas pressure varies the magnitude of the drag force, which in turn governs the metallic particle motion. As stated in [7], sphere type particle contaminants are greatly influenced by the variation in pressure while particles of irregular geometry, like filings, are quiet unaffected by the pressure variations.Though the effect of the drag force is less in case of long particles, the effect of the gas pressure or the drag force may be significant in the case of short particles.At low pressures in practical GITL systems the particle velocities are not sufficiently high for drag forces to be significant [8]. In the present paper, the SF 6 gas pressure inside the gas insulated busduct has been varied from 0.1MPa to 0.6 MPa, to understand effect of pressure on the particle movement on filamentary type particle contaminants.…”

Section: Gas Pressurementioning

confidence: 98%

Investigation of gas pressure on metallic particle contaminationin 1-Ø gas insulated busduct

Reddy

Amarnath

RamaRao

2014

2014 International Conference on Science Engineering and Management Research (ICSEMR)

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SF6 gas has been adopted asan alternative of air for insulation technology in modern day industry due to its high dielectric strength and arc quenching properties. In the recent past, electrical substations are employing gas insulation because of its better properties and also lower space requirement. One of the major reasons for the failure of these gas insulated substations (GIS) is the particle contamination. The free metallic contaminating particles move in the gas insulated busducts by the influence of electric field and lead to the breakdown of the unit.The movement of these particles is governed by various factors and is primarily limited by the drag force which is a function of the pressure of the gas medium.The present work aims at investigating the impact of the SF6 gas pressure, inside the earthed metallic enclosures, on the metallic particle movement. Power frequency overvoltages generally employed for normal transmission are considered. Besides, the study is conducted on different dimensions of gas insulated busduct for better relevance.Wire type particles of commonly encountered contamination, aluminium and copper, with length 12mm and radius 0.25mm are considered to be present on the inner surface of the enclosure. The results show that the maximum displacement of the particles in the gas insulated busduct is independent of the gas pressure.

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Section: Gas Pressurementioning

confidence: 98%

Investigation of gas pressure on metallic particle contaminationin 1-Ø gas insulated busduct

Reddy

Amarnath

RamaRao

2014

2014 International Conference on Science Engineering and Management Research (ICSEMR)

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“…Hauschild et al (255) used only slightly nonuniform fields disturbed by many fine particles. Banford (315) studied the movement of metallic particles on an insulating spacer for the CEGB flexible cable project.…”

Section: Breakdown Of Short Gapsmentioning

confidence: 99%

“…His calculated field strengths make use of the parameter gas-pressure x protrusion-radius (Pr). John and Hauschild (279) claim that defects in SF 6 insulation (electrode burrs, sharp edges, free particles) can be detected by measuring Vo and Vs but Banford (315) states that although it is possible it is not practical for field tests, at least insofar as free conducting particles are concerned. Farish et al (280) address themselves to the question of whether or not gas mixtures containing SF6 are subject to the same electrode roughness constraints as pure SF6.…”

Section: Electrode and Dielectric Effectsmentioning

confidence: 99%

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Electrical breakdown in gases

Beattie¹

1976

Digest of Literature on Dielectrics Volume 40 1976

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“…Over the years, scholars have continued to improve this method through experiments or field applications on the AC GIL equipment. As early as the 1970s, American researchers had begun to design AC particle traps [9,10] and proposed various AC GIL particle traps over the following decades [11]. Recent studies on particle traps have included: scholars placing particle traps near insulators in a true 1100 kV GIL and using experimental methods to obtain a step-by-step voltage application method that optimally inhibits particles in conjunction with particle traps [12].…”

Section: Introductionmentioning

confidence: 99%

Trap Parameters Optimization Based on Metal Particle Dynamic Simulation Method

Wang

Xiao

et al. 2022

Symmetry

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Insulation failure usually occurs in AC gas-insulated transmission (AC GIL) in field operation, in which the primary cause is the charged motion of metal particles in the electric filed. At present, the particle inhibition method applied is to design particle traps on the inner wall of the GIL shell. However, due to the large randomness of the charged motion for metallic particles and the limitations of field test methods, a particle trap has not yet been designed from the perspective of particle trapping effectiveness. In this paper, firstly, referring to the size of a running 252 kV AC GIL, a 1:1 scaled 3-D similarity simulation model is established to obtain the dynamic characteristics of particles with different sizes under the operating voltage level. This model can form symmetry between the real equipment, and its simulated simulation trajectory can achieve symmetry with the actual one. Secondly, an experimental platform that can easily capture the motion of the particles is set up to experimentally verify the symmetry between the field operating equipment and the simulation model. Finally, the particle traps are set on both sides of the concave and convex surface of the basin insulator, and an optimization scheme for the design of the particle trap is proposed from three aspects: the electric field regulation of the trap, the captured probability of particles, and the trap location. The proposed research shows that, with respect to the motion characteristics of the particles, this paper selects circular hole-shaped trap and its thickness, slot spacing, and slot width are 10 mm, 6 mm, and 8 mm, respectively. When the traps are arranged, one at the bottom of the shell at 70 mm and 80 mm from each side of the concave and convex insulator, the capture probability of the traps on both sides can be as high as 78% and 70%, respectively. Therefore, the analysis and optimization method in this paper has important reference value according to similarity concepts for optimizing particle traps in AC GIL at a certain voltage level.

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Particles and breakdown in SF6– insulated apparatus

Cited by 10 publications

References 5 publications

Investigation of gas pressure on metallic particle contaminationin 1-Ø gas insulated busduct

Investigation of gas pressure on metallic particle contaminationin 1-Ø gas insulated busduct

Electrical breakdown in gases

Trap Parameters Optimization Based on Metal Particle Dynamic Simulation Method

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Particles and breakdown in SF6– insulated apparatus

Cited by 10 publications

References 5 publications

Investigation of gas pressure on metallic particle contaminationin 1-&#x00D8; gas insulated busduct

Investigation of gas pressure on metallic particle contaminationin 1-&#x00D8; gas insulated busduct

Electrical breakdown in gases

Trap Parameters Optimization Based on Metal Particle Dynamic Simulation Method

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About

Investigation of gas pressure on metallic particle contaminationin 1-Ø gas insulated busduct

Investigation of gas pressure on metallic particle contaminationin 1-Ø gas insulated busduct