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Investigation of various models for metal oxide varistors
Journal of Electronic Materials, 1976A new type of voltage dependent resistors (varistors), based on zinc oxide ceramics with several other metal oxides as additives, has recently been investigated. The microstructure of these varistors consists of ZnO grains surrounded by thin insulating metal oxide barriers.
J. Bernasconi +3 more
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Second-breakdown characteristics of metal-oxide varistors
Journal of Applied Physics, 1977Several new results on the electrical breakdown properties of ZnO-based ceramic varistors are presented. A second-breakdown phenomenon associated with thermal runaway and characterized by a negative differential conductivity was observed in dc tests. The curve of capacitance versus bias current exhibited hysteresis while the I-V characteristics became ...
J. J. Lee, J. K. O’Brien, M. S. Cooper
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Multi-factor ageing of metal oxide varistors
Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP'94), 2002Localised overheating of zinc oxide varistor elements due to the transfer of external leakage currents arising from the incidence of partial electrical discharges (PD) onto their outer surface has been shown to cause premature failure by surface breakdown.
N.M. Vong +3 more
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Microwave Sintering Technology for the Production of Metal Oxide Varistors
MRS Proceedings, 1990ABSTRACTA microwave sintering technology has been developed for the production of metal oxide varistors. The electrical properties (leakage current and non-linearity coefficient) of the microwave sintered devices were found to be comparable to those obtained for conventionally sintered varistors of identical composition.
G. McMahon +4 more
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Long-time polarization currents in metal-oxide varistors
Journal of Applied Physics, 1976The low-frequency (100–10−4 Hz) behavior of metal-oxide varistors is obtained from analysis of the charging and discharging currents which flow upon the application and removal of a step voltage. These results are compared to data for the complex dielectric constant ε=ε′−iε″ obtained using an ac bridge in the frequency range 101–10−1 Hz.
H. R. Philipp, Lionel M. Levinson
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Development of metal oxide varistor element for power systems
Proceedings of IEEE International Symposium on Industrial Electronics, 2002A highly nonlinear arrester can improve the insulation coordination of electrical substations and reduce the basic impulse level of power systems. Metal oxide varistors with zinc oxide as one of their constituents are used as advanced protective devices for power systems against transient overvoltages.
S.N. Roy +3 more
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Barrier voltage measurement in metal oxide varistors
Journal of Applied Physics, 1976A combination of electrical and ceramic microstructural data has been used to determine the voltage drop across the ZnO-intergranular barrier in some simple and multicomponent ZnO-based varistors at the onset of high non-Ohmicity. The data are obtained by measuring the varistor breakdown field (V/mm) and average grain size of the conductive ZnO matrix ...
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High Voltage Metal Oxide Varistors for Surge Protection
SAE Technical Paper Series, 2008<div class="htmlview paragraph">Zinc oxide based metal oxide varistors (MOV) are widely used electrical surge protection components. Modern high power, high-density electronics post more requirements such as smaller footprints, higher current density and higher nonlinearity on MOVs.
Daniel Qi Tan, Yang Cao, Baojin Chu
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Research and Developpment of a new Material for Metal Oxide Varistors
2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2018Metal Oxide Varistors are, from the chemical point of view, ceramics, acting as n-semiconductors and having a poly-crystalline and complex structure. The main application of these power electronic devices is for construction of overvoltage protection equipment (for every voltage level), because of some advantages like: an increased level of non ...
Nicolae Tarfulea +5 more
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Investigation on Metal Oxide Varistors in DC Circuit Breakers
IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society, 2022Reza Kheirollahi +4 more
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