Electrical properties of composite material containing microvaristor and tetrapod ZnO

Matsuzaki, Hidehito; Nakano, Toshiyuki; Okamoto, Tohru; Ando, Hiroki; Takei, Masafumi; Shiiki, Motoharu

doi:10.1109/eic.2016.7548678

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…When we dope ZnO microvaristors in epoxy resin, the mixtures still show great liquidity during preparation. The ZnO microvaristors will inevitably settle down in epoxy resin, which will lead to the uneven distribution of ZnO microvaristors in the composite and influence the non-linear conductivity of the composite directly [19][20][21]. Matsuzaki et al [19,20] put tetrapod ZnO whiskers as the second filler in ZnO microvaristors/epoxy resin composite to suppress the sedimentation of ZnO microvaristors.…”

Section: Introductionmentioning

confidence: 99%

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Non‐linearly conductive ZnO microvaristors/epoxy resin composite prepared by wet winding with polyester fibre cloth

Yuan

Huang

et al. 2021

High Voltage

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ZnO microvaristors/epoxy resin composite has drawn great attention from academia and industry for its adjustable non-linear conductivity, high mechanical strength, and good ageing resistance. However, the sedimentation of ZnO microvaristors in epoxy resin during preparation is the key problem, which limits its application in engineering. In this study, a novel method of wet winding with polyester fibre cloth is proposed to prepare the ZnO microvaristors/epoxy resin composite. The anti-settling effect of ZnO microvaristors in the composite is verified by scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The microstructure shows that ZnO microvaristors distribute uniformly in the composite, and the content difference of ZnO microvaristors at the top and bottom part is only 0.4%. The composite shows typical non-linear conductivity, and the threshold electric field and the non-linear coefficient decrease with the content of ZnO microvaristors, while the conductivity in the insulating state shows an increasing trend. To verify the field grading effect of the composite with non-linear conductivity (CNC), a finite element model of a needle-plate electrode, simulating the condition of a conductive tip in a solid insulated system, is set up. CNC can adaptively grade the electric field, which reduces the surface electric field of the needle tip by 86.6% and the highest electric field in the system by 82.1%. This wet winding method solidifies the industrial application of CNC in high-voltage power equipment.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

“…Matsuzaki et al. [19, 20] put tetrapod ZnO whiskers as the second filler in ZnO microvaristors/epoxy resin composite to suppress the sedimentation of ZnO microvaristors. Liang et al.…”

Section: Introductionmentioning

confidence: 99%

Non‐linearly conductive ZnO microvaristors/epoxy resin composite prepared by wet winding with polyester fibre cloth

Yuan

Huang

et al. 2021

High Voltage

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“…Other possible applications include high‐ and middle‐voltage devices, including generators, motors, and switchgears . In general, the nonlinear index, α , is employed to evaluate the degree of nonlinearity, and an α greater than 5 generally signifies a material having high nonlinearity and a suitably strong electrical stress grading effect …”

Section: Introductionmentioning

confidence: 99%

Nonlinear resistivity in epoxy composites containing Mn‐based ferrite magnetic particles

Matsuzaki

Suzuki

Naka

et al. 2019

J of Applied Polymer Sci

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In this study, magnetic particles were employed as nonlinear resistive materials in electric stress grading composites. Epoxy resin films containing either manganese-based ferrite magnetic (Mn-FM) particles or manganese-magnesium-based ferrite magnetic particles were prepared, and the threshold voltages required for these films to exhibit nonlinear resistivity were determined. The sample containing Mn-FM particles having irregular shapes [Mn-FM(i)] at 20 vol % showed the highest nonlinear resistivity. Assessments of the magnetic characteristics of these materials demonstrated a relationship between magnetic flux density and nonlinear resistivity. The magnetic flux density of the Mn-FM(i) composite was the highest among the various specimens, indicating that magnetic flux density may affect nonlinear resistivity.

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Electric Field Relaxation Effect of Micro-varistor/epoxy Composite

Abe

Harada

Nakano

et al. 2018

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Electrical properties of composite material containing microvaristor and tetrapod ZnO

Cited by 7 publications

References 2 publications

Non‐linearly conductive ZnO microvaristors/epoxy resin composite prepared by wet winding with polyester fibre cloth

Non‐linearly conductive ZnO microvaristors/epoxy resin composite prepared by wet winding with polyester fibre cloth

Nonlinear resistivity in epoxy composites containing Mn‐based ferrite magnetic particles

Electric Field Relaxation Effect of Micro-varistor/epoxy Composite

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