Comparison of Insulation Breakdown Properties of Epoxy Nanocomposites under Homogeneous and Divergent Electric Fields

Imai, T.; Sawa, Fumio; Ozaki, T.; Inoue, Y.; Shimizu, Toshio; Tanaka, Toshikatsu

doi:10.1109/ceidp.2006.311930

Cited by 32 publications

(17 citation statements)

References 5 publications

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“…According to this model, it could be deduced from data in Table 1 that after surface coating, the obtained core-shell particle possess excellent surface insulativity, and retained the high polarizable features of TiO2 at the same time. Figure 4 shows the effects of silica encapsulation of TiO 2 on DC dielectric breakdown strength of epoxy composites by comparison with the ones filled with uncoated TiO 2 which have been widely studied pertain to either low or high filler loading [2,7,18,19]. For composites filled with raw TiO 2 , similar result was observed in present work that with increase of filler loading, DC dielectric breakdown strength of the composites generally decreased.…”

Section: Characteristics Of Tio2@sio2 Core-shell Nanoparticlessupporting

confidence: 84%

Investigation on relationship between breakdown strength enhancement of composites and dielectric characteristics of nanoparticle

Yuan-wu

2016

IEEE Trans. Dielect. Electr. Insul.

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In this work, the relationship between dielectric characteristics of nanoparticle and its effects on dielectric breakdown strength of Epoxy was investigated. The dielectric characteristic was tailored through silica surface encapsulation on TiO2. It was found that in contrast to raw TiO2, addition of TiO2@SiO2 core-shell nanoparticle obviously improved the dielectric breakdown strength of epoxy resin. Meanwhile, peculiar increase of resistivity was also observed. Based on the results, a mechanism through "barrier effect" by electric double layer was proposed to explain this enhancement, which was regarded closely associated with the highly polarizable and surface insulating features of TiO2 after silica encapsulation. Experimental validation was also conducted with permittivity and space charge distribution measurement of composites. It was concluded that the high polarizability and surface insulativity firstly favored formation of the double layer, synergistically from which the resulted space charge in homo-pattern then suppressed excessive charge injection through Coulomb repulsive interaction, and improved electrical strength by retarding exorbitant localized field occurrence which had been found to be direct cause of breakdown when it exceed a critical value.Index Terms -Barrier effect, core-shell nanoparticle, dielectric breakdown, dielectric characteristics of nanoparticle, dielectric double layer, enhancing mechanism, epoxy nanocomposites.

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Section: Characteristics Of Tio2@sio2 Core-shell Nanoparticlessupporting

confidence: 84%

Investigation on relationship between breakdown strength enhancement of composites and dielectric characteristics of nanoparticle

Yuan-wu

2016

IEEE Trans. Dielect. Electr. Insul.

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“…Better results can be obtained for MNCs through the combination of micro and nanofiller content which have yielded best results individually [42]. In case of epoxy nanocomposites, several inconsistent results in terms of dielectric breakdown strength are observed [59,60]. The same nanofiller with same epoxy matrix gives different results which may be due to poor dispersion of nanofiller and method of preparation as in Fig.…”

Section: Discussionmentioning

confidence: 99%

A Review on Nanocomposite Based Electrical Insulations

Paramane¹,

Kumar²

2016

Transactions on Electrical and Electronic Materials

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The potential of nanocomposites have been drawing the intention of the researchers from energy storage to electrical insulation applications. Nanocomposites are known to improve dielectric properties, such as the increase in dielectric breakdown strength, suppressing the partial discharge (PD) as well as space charge, and prolonging the treeing, etc. In this review, different theories have been established to explain the reactions at the interaction zone of polymer matrix and nanofiller; the characterization methods of nanocomposites are also presented. Furthermore, the remarkable findings in the fields of epoxy, cross-linked polyethylene (XLPE), polypropylene and polyvinyl chloride (PVC) nanocomposites are reviewed. In this study, it was observed that there is lack of comparison between results of lab scale specimens and actual field aged cables. Also, non-standardization of the preparation methods and processing parameters lead to changes in the polymer structure and its surface degradation. However, on the positive side, recent attempt of 250 kV XLPE nanocomposite HVDC cables in service may deliver a promising performance in the coming years. Moreover, materials such as self-healing polymer nanocomposites may emerge as substitutes to traditional insulations.

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“…They found that high voltage arcing is improved by a factor of 3 and resistance to tracking and erosion is enhanced for 5 wt% Silica 1 loading. Imai et al [20] concluded that 5 wt% TiO 2 and silica‐filled epoxy nanocomposites showed superior breakdown properties than neat epoxy under homogeneous and divergent electrical field. Silica‐filled epoxy nanocomposites are finding their application as in electrical insulation systems due to their good electrical properties [19–21].…”

Section: Introductionmentioning

confidence: 99%

Tribological and electrical properties of silica‐filled epoxy nanocomposites

Veena¹,

Renukappa²,

Shivakumar³

2011

Polymer Composites

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The tribological and electrical properties of epoxy composites filled with nano‐sized silica particles are studied and discussed in this article. To enhance the interfacial interaction between the fillers and the matrix, nanoparticles were pretreated with silane coupling agent. Dry sliding wear tests were carried out with configuration of composite sample on a rotating steel disc. Electrical measurements such as AC breakdown voltage, at 50 Hz, high voltage‐low current arc resistance and wet tracking resistance were carried out. The results reveal the influence of nanosized silica loading on wear resistance of the epoxy. It is observed that 10 wt% loading of silica is very effective in reducing the wear loss. With further increase of silica filler loading, the nanoparticles agglomerated and resulted in increase of the specific wear rate. The influence of silica particles on the specific wear rate is more pronounced under sliding wear situation. The influence of silica particle loading on epoxy is evident in the results of electrical parameters like dielectric strength, arc resistance and tracking resistance. These parameters showed improvement with filler loading up to 15 wt% and beyond this value of filler loading noticeable deterioration was observed. The effects of electrical stresses in the morphologies of the surfaces of epoxy nanocomposites are discussed. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers

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Comparison of Insulation Breakdown Properties of Epoxy Nanocomposites under Homogeneous and Divergent Electric Fields

Cited by 32 publications

References 5 publications

Investigation on relationship between breakdown strength enhancement of composites and dielectric characteristics of nanoparticle

Investigation on relationship between breakdown strength enhancement of composites and dielectric characteristics of nanoparticle

A Review on Nanocomposite Based Electrical Insulations

Tribological and electrical properties of silica‐filled epoxy nanocomposites

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