Analysis of the electric field and force in an arrangement of a conducting sphere and a plane electrode with a dielectric barrier

Techaumnat, Boonchai; Takuma, Tadasu

doi:10.1109/tdei.2006.1624278

Cited by 26 publications

(5 citation statements)

References 19 publications

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“…The method is assumed to remain valid at RF frequencies because the tip dimension is very small compared to the free space RF wavelength. Image charge methods allow field distributions under Maxwellian boundary conditions to be found analytically for conductors and dielectrics that have simple geometrical shapes -see reference [24] for example. GX assume a tip that is a perfect sphere in proximity to a planar dielectric specimen of infinite extent.…”

Section: Calculationmentioning

confidence: 99%

Measurement of the permittivity and loss of high-loss materials using a Near-Field Scanning Microwave Microscope

et al. 2016

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Section: Calculationmentioning

confidence: 99%

Measurement of the permittivity and loss of high-loss materials using a Near-Field Scanning Microwave Microscope

et al. 2016

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“…Based on there, we could further explain the motion state of particles. The particles moving between electrodes mainly suffered gravitational force (F G ), buoyant force (F b ), the electric field force (F e ), electric field gradient force (F gard ), Particle interaction (F i ) and the drag force (F D ) [6][7]15]. When the oil is still, as shown in Figure 6.…”

Section: Discussionmentioning

confidence: 99%

Accumulation characteristics of free metallic particles in flowing transformer oil under uniform and non-uniform electric field

Wang

Men

Huang

et al. 2022

J. Phys.: Conf. Ser.

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Transformer oil is easily polluted by metal particles. Once the metal particles accumulate in the oil channel, the insulation performance of the equipment will be greatly reduced. In this paper, an oil circulation device was built and the accumulation characteristics of free metal particles in flowing transformer oil were carried out under uniform and non-uniform electric field. The images of particle accumulation process were captured by a high-speed camera. Simultaneously, we analysed the force conditions of particles in oil. And the accumulation mechanisms under different electric fields were discussed combined with the particle trajectories. It was reported that particle accumulation could be observed in static oil under both electric fields. The particle concentration between electrodes decreased gradually with time. However, when the transformer oil was flowing, the accumulation concentration of particles decreased significantly with the increase of flow velocity. The accumulation of metal particles was seriously damaged, even no longer occurred.

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“…where Q is the charge quantity of particles after contacting the electrode, λ e is the correction coefficient of the electric field force. f 1 and f 2 represent the correction functions, which are determined by the multiple-image method [26,27]. E is the electric field, D is the spacing between plate electrodes, and h is the distance between the particle centroid and the grounded electrode.…”

Section: Numerical Modeling Of Particle Motionmentioning

confidence: 99%

Motion behaviours and PD characteristic of free metallic particles in flowing transformer oil with paper‐covered electrodes

Yao

Pan

et al. 2022

IET Generation Trans & Dist

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The introduction of solid dielectrics to electrode surfaces will change the motion behaviours of free metallic particles and in turn affect partial discharge (PD) characteristics in transformer oil. To estimate the influence, the metallic particles movement in flowing oil was compared between different cases with and without insulating paper covering electrodes here. When the electrodes were bare, particles executed up‐down movements repeatedly in the vertical direction. As the electrodes were paper‐covered, the particles would settle on the paper surface for a period of time. Simultaneously, the PD characteristics caused by metallic particles were measured. When the electrodes were bare, the discharges concentrated in 0–90° and 300–360° and the PD magnitude reached 390 pC. When the double electrodes were paper‐covered, the PD magnitude decreased by 67% and the concentration phases of PDs would migrate to 45° and 160°. In order to analyse the experimental results, a simulation model with a paper‐covered boundary was constructed. Simulated trajectories of particles were in accord with the experiment results. Base on the model, the particle motion characteristics were obtained and the electric field distribution between the particle and electrode was calculated. Finally, the influence of paper‐covering on PD characteristics was discussed.

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Analysis of the electric field and force in an arrangement of a conducting sphere and a plane electrode with a dielectric barrier

Cited by 26 publications

References 19 publications

Measurement of the permittivity and loss of high-loss materials using a Near-Field Scanning Microwave Microscope

Measurement of the permittivity and loss of high-loss materials using a Near-Field Scanning Microwave Microscope

Accumulation characteristics of free metallic particles in flowing transformer oil under uniform and non-uniform electric field

Motion behaviours and PD characteristic of free metallic particles in flowing transformer oil with paper‐covered electrodes

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