Nano-clay and micro-silica mixed composites for insulating materials for environmentally-conscious switchgear

Ozaki, T.; Komiya, Gen; Murayama, Kiyoko; Imai, T.; Sawa, Fumio; Shimizu, Toshio; Harada, Miyuki; Ochi, Mitsukazu; Ohki, Yoshimichi; Tanaka, Toshikatsu

doi:10.1109/icpadm.2009.5252223

Cited by 4 publications

(2 citation statements)

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“…It is an essential question to the tree initiation processes, which would help us understand these phenomena and mechanisms. For the opaque materials, such as MC (microcomposite) and NMMCs (nano-micro mixed composites) which are widely researched [3][4][5][6], their tree initiation process has never been investigated. What is different with the NCs (nano composites)?…”

Section: Introductionmentioning

confidence: 99%

Tree initiation phenomena in nanostructured epoxy composites

Chen

Imai

Ohki

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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Tree initiation time was evaluated by a pulse detection system to detect a small PD (partial discharge) signal that might take place at first just after a tree was formed. Six kinds of materials were prepared for evaluation, i.e. base epoxy resin, microcomposite, two kinds of nanocomposites, and two kinds of nano-micro-mixed-composites. Lengths of trees detected were around 100 μm in our experiments. As a result, it was clarified that the tree initiation time is prolonged by the nanofiller inclusion, but shortened by the microfiller filling. Furthermore, the co-addition of nanofillers to the microcomposite increases the tree initiation time again in comparison to the once-shortened time in the microcomposite. As for the PD erosion evaluated for the same materials, a good correlation was confirmed between the tree initiation time and PD resistance. This correlation indicates that the tree formation process includes PD erosion. Simulation results show that trees should propagate between fillers.

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Section: Introductionmentioning

confidence: 99%

Tree initiation phenomena in nanostructured epoxy composites

Chen

Imai

Ohki

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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“…Therefore, epoxy resin is used to insulate molded transformers, current transformers, potential transformers, metering outfits, and gas-insulated switchgear [2]. Recently, the new field referred to as nanoscience and nanotechnology has emerged, in line with notable research advances that revealed new physical phenomena and improved material properties in the nano-sized ultra-micro region [3]. In particular, a key focus has been research into various nanocomposite materials by developing nanocomposite insulation materials.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Electrical and Thermal Characteristics of Nano-Micro Epoxy Composite

Cho¹,

Kim²,

Kwon³

et al. 2011

Transactions on Electrical and Electronic Materials

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Polymer nanocomposite has been attracting more attention as a new insulation material because homogeneous dispersion of nano-sized inorganic fillers can improve various properties significantly. In this paper, various kinds of epoxy-based nanocomposites were made, and the AC breakdown strengths of Nano filler and micro-SiO 2 filler mixtures of epoxy-based composites were analyzed using sphere-to-sphere electrodes. Moreover, nano-and microfiller combinations were investigated as an approach to practical application of nanocomposite insulation materials. Its composition ratio was 100 (resin):82 (hardener):1.5 (accelerator). AC breakdown tests were performed at room temperature (25°C), 80°C, and 100°C in the vicinity of T g (90°C). Thermal conductivity was measured using TC-30.

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