Comparative Studies on Degradation of Varistors Subjected to Operation in Surge Arresters and Surge Arrester Counters [PDF]
Archives of Metallurgy and Materials, 2020 The paper presents results of investigation of microstructure and micro-hardness for material of ZnO varistors applied to 110 kV surge arrester and surge arrester counter.
P. Papliński +6 more
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Machine Learning Enabled Cluster Grouping of Varistors in Parallel-Structured DC Circuit Breakers
IEEE Open Journal of Power Electronics, 2023 This letter presents the first ever trial of machine learning enabled cluster grouping of varistors for DC circuit breakers (DCCBs). It reveals that the manufacturing discrepancy of varistors is a main challenge in their parallel connection. The proposed
Shuyan Zhao +5 more
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Effect of Zn7Sb2O12 pre-synthesis on microstructure and properties of ZnO varistor ceramics
AIP Advances, 2022 In this work, the Zn7Sb2O12 spinel phase is pre-synthesized at 980, 1000, 1020, 1040, and 1060 °C by mixing ZnO and Sb2O3 in a molar ratio of 7:1. ZnO varistors are prepared by replacing Sb2O3 with the Zn7Sb2O12 spinel phase.
Fei Zhu +5 more
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Predicting the Life of Varistors via a Nonlinear Coefficient Based on a Small-Scale Data Model
Applied Sciences, 2023 With the great leaps forward in the development of the railway, the importance of safe operation and maintenance has become increasingly prominent. Varistor is the key component insurge protective devices for railway communication and signaling equipment,
Xiaofei Ruan +3 more
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Comparative Characterization of Different Cutting Strategies for the Sintered ZnO Electroceramics
Applied Sciences, 2021 Sintered zinc oxide (ZnO) ceramic is a fragile and difficult-to-cut material, so finishing operations demand handling cautious and accurate surface tolerances by polishing, grinding, or machining.
Jaka Dugar, Awais Ikram, Franci Pušavec
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Investigation of microstructure of ZnO varistors taken from surge arrester counters [PDF]
Archives of Metallurgy and Materials, 2019 The paper presents investigations of microstructure of varistors of damaged surge arrester counters. A similar ZnO varistor, not subjected before to operation, was a point of reference in this research.
P. Papliński +3 more
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Crystals, 2020 ZnO-based ceramic varistors have shown excellent electrical and dielectric properties due to their characteristics microstructures represented by the arrangement of their grains and grain boundaries that allow the absorption and flow of energy when ...
J. Porcayo-Calderon +8 more
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Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling
Energies, 2019 Metal oxide varistors are applied today inside modern surge arresters for overvoltage protection for all voltage levels. Their main issue is the thermal activation of their crossing current, which could lead to complete destruction by thermal runaway ...
Flaviu Mihai Frigura-Iliasa +3 more
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High Voltage, 2019 In this article, an analysis of heat transfer in a porcelain-housed ZnO surge arrester is presented. Due to the fact that ZnO-based surge arresters are key components for protection and reliability of electrical systems, it is necessary to seek ...
Arthur F. Andrade +5 more
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Microstructural and nonohmic properties of ZnO.Pr6O11 CoO polycrystalline system
Materials Research, 2010 The microstructure and electrical properties of varistors composed of (95-x) ZnO + x Pr6O11 + 5 CoO (ZPC), (x = 0.1, 0.5 and 1.0) and sintered at 1300 and 1350 °C, were investigated. According to X-ray diffraction, several phases (ZnO, Pr2O3 and Pr2CoO4)
Miguel Angel Ramírez +5 more
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