Novel zinc-oxide varistor with superior performance in voltage gradient and aging stability for surge arrester

Meng, Pengfei; Zhao, Xiaolei; Fu, Zhiyao; Wu, Jinbo; Hu, Jun; He, Jinliang

doi:10.1016/j.jallcom.2019.02.310

Cited by 30 publications

(5 citation statements)

References 16 publications

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“…ZnO varistor ceramics are key components of metal oxide arresters in power systems and surge protective devices for low-voltage electronic circuits [1]. The development of ultrahigh voltage transmission line projects has given rise to the need for ZnO arresters with higher voltage gradients and larger current withstanding capabilities [2,3]. Generally, two methods are used to improve the voltage gradient.…”

Section: Introductionmentioning

confidence: 99%

High‐performance ZnO varistor ceramics prepared by arc‐induced flash sintering with low energy consumption at room temperature

Zhixiang

Wang

et al. 2021

High Voltage

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The development of ultra‐high voltage transmission lines requires a ZnO arrester with excellent electrical response and high voltage gradient. Compared with conventional preparation methods, flash sintering allows fast production of novel high‐performance ZnO varistor ceramics with low energy consumption and controlled grain growth. Herein, ZnO varistor ceramics were prepared using the flash sintering method at an air pressure of 21 kPa for 60 s at 25°C. The results showed that the flash‐sintered samples had fine grains and reduced loss of volatile elements. Moreover, the voltage gradient, leakage current density, and non‐linear coefficient of the flash‐sintered varistor ceramics were significantly improved compared with those of conventionally sintered samples. Owing to the short preparation time and absence of a heating process, the energy consumption of the proposed flash sintering method was significantly reduced to 10% of that by conventional sintering. The proposed method is a promising approach for the preparation of ZnO arresters with excellent electrical properties and serves as an effective method that realises energy saving and emission reduction.

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Section: Introductionmentioning

confidence: 99%

High‐performance ZnO varistor ceramics prepared by arc‐induced flash sintering with low energy consumption at room temperature

Zhixiang

Wang

et al. 2021

High Voltage

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“…The microstructures of the ZnO microvaristors with particle diameters of 30 and 55 μm are shown in Figure 4a and b. The microvaristor is composed of a large number of micron-size grains, which enables the microvaristor with non-linear conductivity [24,25].…”

Section: Resultsmentioning

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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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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“…Other notable characteristics of MOVs are high energy absorption capability, reduced power loss, and good stability against aging (degradation) processes [69][70][71][72]. For instance, ZnO-based systems for use in 1000 kV surge arresters in ultra-HV grids have to exhibit a high voltage gradient (E B > 4 kV/cm) and energy absorption capability > 300 J/cm 3 to improve the performance of MOSAs with reduced height [69,73].…”

Section: Parameter Function Comments Referencementioning

confidence: 99%

Effects of Dopants and Processing Parameters on the Properties of ZnO-V2O5-Based Varistors Prepared by Powder Metallurgy: A Review

Lungu¹

2023

Materials

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This article reviews the progress in developing ZnO-V2O5-based metal oxide varistors (MOVs) using powder metallurgy (PM) techniques. The aim is to create new, advanced ceramic materials for MOVs with comparable or superior functional properties to ZnO-Bi2O3 varistors using fewer dopants. The survey emphasizes the importance of a homogeneous microstructure and desirable varistor properties, such as high nonlinearity (α), low leakage current density (JL), high energy absorption capability, reduced power loss, and stability for reliable MOVs. This study investigates the effect of V2O5 and MO additives on the microstructure, electrical and dielectric properties, and aging behavior of ZnO-based varistors. The findings show that MOVs with 0.25–2 mol.% V2O5 and MO additives sintered in air over 800 °C contain a primary phase of ZnO with a hexagonal wurtzite structure and several secondary phases that impact the MOV performance. The MO additives, such as Bi2O3, In2O3, Sb2O3, transition element oxides, and rare earth oxides, act as ZnO grain growth inhibitors and enhance the density, microstructure homogeneity, and nonlinearity. Refinement of the microstructure of MOVs and consolidation under appropriate PM conditions improve their electrical properties (JL ≤ 0.2 mA/cm2, α of 22–153) and stability. The review recommends further developing and investigating large-sized MOVs from the ZnO-V2O5 systems using these techniques.

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Novel zinc-oxide varistor with superior performance in voltage gradient and aging stability for surge arrester

Cited by 30 publications

References 16 publications

High‐performance ZnO varistor ceramics prepared by arc‐induced flash sintering with low energy consumption at room temperature

High‐performance ZnO varistor ceramics prepared by arc‐induced flash sintering with low energy consumption at room temperature

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

Effects of Dopants and Processing Parameters on the Properties of ZnO-V2O5-Based Varistors Prepared by Powder Metallurgy: A Review

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