Insulation properties of nano- and micro-filler mixture composite

Imai, T.; Sawa, Fumio; Nakano, Takashi; Ozaki, T.; Shimizu, Toshio; Kuge, S.; Kozako, Masahiro; Tanaka, Toshikatsu

doi:10.1109/ceidp.2005.1560648

Cited by 28 publications

(18 citation statements)

References 6 publications

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“…Below this value, the quantum confinement effect of nanoparticles possibly dominates the ac BD properties, or the interface plays a key role. An interesting result is that the ac BD property of NMMC is superior to nanocomposite and microcomposite [15], which is the same as the surface flashover performance. It was assumed that an increase in the possibility of an electron scattered in NMMC prevents electrical treeing from propagating efficiently.…”

Section: Breakdown Properties Of Nanodielectricssupporting

confidence: 52%

“…In this way, the results of nanodielectric properties have little comparability and poor reproducibility, which has been confirmed by the reported data. Some groups reported that the nanoparticles can help to improve the short-term performance [13,[15][16], while others experiments observed the opposite results [17], indicating that the role of nanoparticles in matrix is still unclear in the short-term breakdown. However, the long-term performances, such as PD resistance and ageing resistance, are superior to the matrix.…”

Section: Manuscript Received On 2 February 2010 In Final Form 26 Maymentioning

confidence: 99%

“…Lots of research works on nanodielectric BD properties under ac or dc voltage have been done so far [15][16][53][54][55][56][57][58][59][60][61]. Many useful experimental data are obtained.…”

Section: Breakdown Properties Of Nanodielectricsmentioning

confidence: 99%

“…It was assumed that an increase in the possibility of an electron scattered in NMMC prevents electrical treeing from propagating efficiently. A model had been put forward for the improvement of ac BD strength in NMMC [15]. 3 loading with average diameter of 1 μm (impulse waveform is 65ns/600ns) and nanoAl(OH) 3 loading with average diameter of 50 nm (inset figure, impulse waveform is 40ns/300ns).…”

Section: Breakdown Properties Of Nanodielectricsmentioning

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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Section: Breakdown Properties Of Nanodielectricssupporting

confidence: 52%

Section: Manuscript Received On 2 February 2010 In Final Form 26 Maymentioning

confidence: 99%

Section: Breakdown Properties Of Nanodielectricsmentioning

confidence: 99%

Section: Breakdown Properties Of Nanodielectricsmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Their behavior has been investigated through various techniques, such as Transmission Electron Microscopy, TEM, Wide-Angle X-Ray Spectroscopy, WAXS, mechanical strength, conduction current, space charge, partial discharges and voltage breakdown tests (4)- (11) . It has been proved that the dispersion of an inorganic phase in the polymeric matrix may improve voltage endurance (9)- (12) , dielectric strength (4), (12)- (14) , thermal stability (2)(5) (15) and mechanical properties (1) (16) in relation to particle size and arrangement on nanometric scale. Contrasting information can be found in literature regarding to polarization behavior.…”

Section: Introductionmentioning

confidence: 99%

Polarization Processes of Nanocomposite Silicate-EVA and PP Materials

Montanari

Palmieri

Testa³

et al. 2006

IEEJ Trans. FM

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Recent works indicate that polypropylene (PP) and ethylene-vinylacetate (EVA) filled by nanosilicates may present low content of space charge and high electric strength. It has been proved that the dispersion of an inorganic phase in the polymeric matrix may improve voltage endurance, dielectric strength, thermal stability and mechanical properties in relation to particle size and arrangement on nanometric scale. Two polymeric materials, widely employed as electrical insulation for apparatus involved in energy transport, that is, ethylene vinylacetate (EVA) and isotactic polypropylene (PP) are examined. The nanofiller consists of an organophilic layered silicate (MEE), the purified MEE will be named MEE-w.Dielectric spectroscopy in time and frequency domain constitutes a useful tool for electrical insulation evaluation and diagnosis, and it can contribute to the understanding of electrical behaviour of complex solid polymer systems. In this paper, the results of dielectric spectroscopy analysis in time and frequency domain, for purified and unpurified filler nanocomposites, in a wide temperature range, are presented.Frequency-domain dielectric measurements were performed in order to appreciate the relaxation processes taking place at lower temperatures (-20 to 20 °C) over the 10 2 -10 6 Hz frequency range.The charging-discharging current measurements, through Fourier time to frequency data transformation, gave information about the slowest polarisation processes, that are usually hidden by the conduction current contribution. Space charge measurement data are also considered in order to understand the effect of nanostructuration and purification on charge carriers. While the relaxation process of EVA, α process, associated with glass transition of the material amorphous phase, results unchanged from base to nanostructured material (i.e., the nanofiller particles do not affect the chain mobility of the polymer), nanocomposites EVA and PP have shown the rise of a new process at higher temperatures respect to the typical host material processes, as well as a different distribution of relaxation processes. In Fig. 1, that displays the imaginary permittivity of EVA+MEE-w nanocomposite, the loss peaks, due to the α and α' process, can be clearly seen. The α' process can be ascribed to the interaction between the polymer matrix and MEE nanolayers.The temperature location of the process, which approaches the melting region of EVA, and its absence in the pure polymer let us argue that the α' relaxation process can be ascribed to a charge polarization of the Maxwell-Wagner-Sillars type, which is due likely to charge trapping at the interfaces between the nanofiller particles and the polymer. All the presented relaxation processes are thermally-activated and their activation energies, reported in Table 1, were estimated reporting the loss peak frequency and temperature of the isothermal measurements in the Arrhenius plot.The EVA nanocomposite obtained by an unpurified filler has shown a huge increment of real and imaginary...

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Effects of inorganic fillers on withstanding short‐time breakdown and long‐time electrical aging of epoxy composites

Sheng

Jiang

et al. 2017

IEEJ Transactions Elec Engng

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Inorganic fillers were added to epoxy resin for preparing micro and nano filler/epoxy composite, and then the breakdown strengths, depths of erosion caused by partial discharge, and electrical tree experiments of composites were investigated. It was found that the loading of micro fillers usually decreases the short-time breakdown strength (breakdown under a continuously rising voltage) of the composites. On the contrary, it increases the ability to withstand long-time electrical aging (erosion or breakdown caused by electrical tree under a discontinuously rising voltage or constant voltage) of the composites. The effect of inorganic fillers in suppressing the electrical tree or erosion channel propagation in the composite is different during the process of withstanding short-time breakdown and long-time electrical aging. Defects are introduced during the mixing of fillers and epoxy resin, which play a role to decrease the short-time breakdown strength and accelerate long-time electrical aging. It is concluded that micro and nano inorganic fillers can suppress the electrical tree channel propagation and erosion caused by partial discharge, whereas defects play the opposite role in composites. Two opposite effects of inorganic fillers and defects exist simultaneously during the process of electrical aging and breakdown; whereas inorganic fillers play a primary role in long-time electrical aging, defects play a primary role in short-time breakdown.

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Insulation properties of nano- and micro-filler mixture composite

Cited by 28 publications

References 6 publications

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

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

Polarization Processes of Nanocomposite Silicate-EVA and PP Materials

Effects of inorganic fillers on withstanding short‐time breakdown and long‐time electrical aging of epoxy composites

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