Nano/Micro Dielectric Surface Flashover in Partial Vacuum

Kirkici, H.; Serkan, M.; Koppisetty, K.

doi:10.1109/tdei.2007.4286508

Cited by 35 publications

(10 citation statements)

References 13 publications

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“…It is useful to improve the flashover voltage of dielectric material. Some works have been done in epoxy resin (EP) [42][43][44][45][46][47][48][49][50].…”

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

“…Nanofillers can introduce deep traps into material whereas mircofillers bring shallow traps [49][50]52].That is to say, theoretically, it can improve the surface flashover voltage by optimizing the proportion of micro and nano particles co-doped. The [42,43], ◄ from [42,43], ★ from [42,43], ◆ from [44], ▲ from [45], ■ from [46], 〇 from [45,47], untreated;…”

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

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Short-term breakdown and long-term failure in nanodielectrics: a review

Yin

Chen

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

291

172

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Nanodielectrics, which are concentrated in polymer matrix incorporating nanofillers, have received considerable attention due to their potential benefits as dielectrics. In this paper, short-term breakdown and long-term failure properties of nanodielectrics have been reviewed. The characteristics of polymer matrix, types of nanoparticle and its content, and waveforms of the applied voltage are fully evaluated. In order to effectively comment on the published experimental data, a ratio k has been proposed to compare the electric properties of the nanodielectrics with the matrix and assess the effect for nanoparticles doping. There is evidence that the short-term breakdown properties of nanodielectrics show a strong dependence on the applied voltage waveforms. The polarity and the cohesive energy density (CED) of polymer matrix have a dramatic influence on the properties of nanodielectrics. Nanoparticle doped composites show a positive effect on the long-term failure properties, such as ageing resistance and partial discharge (PD) properties of nanocomposites are superior than microcomposites and the matrix. The larger the dielectric constant and CED of the matrix become, the more significant improvements in long-term performance appear. Based on the reported experimental results, we also present our understandings and propose some suggestions for further work.

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“…It is useful to improve the flashover voltage of dielectric material. Some works have been done in epoxy resin (EP) [42][43][44][45][46][47][48][49][50].…”

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

Short-term breakdown and long-term failure in nanodielectrics: a review

Yin

Chen

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

291

172

View full text Add to dashboard Cite

show abstract

“…Recently, polymer nanodielectrics have attracted considerable interest, since they exhibit not only favorable bulk electrical properties, e.g., good dielectric response, [22][23][24] high breakdown strength, [23][24][25] and reduced space charge accumulation, 26 but also present some favorable surface properties, such as reduced surface erosion, tracking failure 27 and surface flashover. [28][29][30][31] It should be noted that incorporation of nanofillers into a polymer or its micro composites is a potential choice likely to enhance surface flashover strength.…”

Section: Introductionmentioning

confidence: 99%

“…For example, surface nanoparticles can generate multiple triple points, which prevent flashover by scattering the charge carrier transport and mitigating the surface charge accumulation. 29 The interface can generate and modify the traps in the polymer, which could suppress the SEE and surface charging 30 However, these prior researches contain mainly qualitative descriptions. The parameters of the SEE characteristics when modified by nanoparticles have received relatively little attention, particularly with regard to impulse flashover.…”

Section: Introductionmentioning

confidence: 99%

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Wang

Min

2016

AIP Advances

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This work studies the correlation between secondary electron emission (SEE) characteristics and impulse surface flashover in polyethylene nanodielectrics both theoretically and experimentally, and illustrates the enhancement of flashover voltage in low-density polyethylene (LDPE) through incorporating Al2O3 nanoparticles. SEE characteristics play key roles in surface charging and gas desorption during surface flashover. This work demonstrates that the presence of Al2O3 nanoparticles decreases the SEE coefficient of LDPE and enhances the impact energy at the equilibrium state of surface charging. These changes can be explained by the increase of surface roughness and of surface ionization energy, and the strong interaction between nanoparticles and the polymer dielectric matrix. The surface charge and flashover voltage are calculated according to the secondary electron emission avalanche (SEEA) model, which reveals that the positive surface charges are reduced near the cathode triple point, while the presence of more nanoparticles in high loading samples enhances the gas desorption. Consequently, the surface flashover performance of LDPE/Al2O3 nanodielectrics is improved.

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“…silica or alumina) to achieve the same low thermal expansion as aluminum or copper conductors and to avoid exfoliating between the epoxy casting part and the conductor caused by heat-cycle [2]. The last decade has witnessed significant developments in the area of nanoparticulate and nano-dielectric materials, and the effects of nano-scale fillers on electrical, thermal, and mechanical properties of polymeric materials [3]. However, tracking failure may appear on the surfaces of solid polymeric insulating materials, which worsens the electrical strength.…”

Section: Introductionmentioning

confidence: 99%

Application of nonlinear methods in tracking failure test of epoxy/SiO<inf>2</inf> nanocomposite

Zhang

et al. 2010

2010 10th IEEE International Conference on Solid Dielectrics

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This paper investigates the effect of nano-scale SiO 2 on the tracking failure properties of nanocomposites. Test samples were made by dispersing nano-scale SiO 2 powder in epoxy with the weight ratios of 0, 1, 3, 5, 7, 9 wt%. AC voltage was applied on a pair of needle-plate electrodes at the surface with the insulation distance of 10 mm. The time to tracking failure and discharge current were recorded. In order to distinguish the change of the tracking resistance from the confusing discharge current, a recurrence plot (RP) analysis of discharge current has been used. The patterns of the tracking failure were analyzed with fractal dimension (FD) method to quantify the carbonization degree. The results reveal that 3 wt% of nano-scale SiO 2 filler greatly increase the resistance to tracking failure of epoxy/SiO 2 nanocomposite.

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Nano/Micro Dielectric Surface Flashover in Partial Vacuum

Cited by 35 publications

References 13 publications

Short-term breakdown and long-term failure in nanodielectrics: a review

Short-term breakdown and long-term failure in nanodielectrics: a review

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Application of nonlinear methods in tracking failure test of epoxy/SiO<inf>2</inf> nanocomposite

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