Results 151 to 160 of about 236 (182)
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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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Nano-Enabled Metal Oxide Varistors for Surge Protection
2008 IEEE International Power Modulators and High-Voltage Conference, 2008Commercial metal oxide varistor (MOV) devices provide a combination of high voltage, peak current, pulse energy absorption, and fast response speed. The non-uniformity and defects, however, may lead to relatively low voltage and energy dissipation, high leakage, low reliability and mechanical cracking.
Daniel Tan +4 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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A new component - the metal oxide varistor suppressor
1972 IEEE Power Processing and Electronics Specialists Conference, 1972The paper deals with the novel aspects of a newly developed transient voltage suppressor. Details of its operation, fabrication and characterization are given. Its performance is compared against the more familiar devices currently used for transient voltage protection including devices such as spark gaps, zeners and selenium suppressors.
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Sintering and microstructural development of metal oxide varistor ceramics
Materials Research Bulletin, 1993Anomalous retardation of the sintering kinetics of ZnO with addition of Bi[sub 4]Ti[sub 3]O[sub 12] (BIT) and a low voltage varistor composition containing ZnO, BIT, Co[sub 3]O[sub 4] and Mn[sub 2]O[sub 3] in the temperature interval between 780 and 850 C was investigated.
D. Makovec, D. Kolar, M. Trontelj
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Repetitive Impulse Withstand Performance of Metal–Oxide Varistors
IEEE Transactions on Power Delivery, 2017This study focuses on the relationship between test current waveforms and impulse withstand capability of metal–oxide varistors (MOVs) (withstand energy, current density, and the number of withstand shots) in repetitive impulse application and discusses the mechanical and electrical failure mechanisms.
Naoyuki Tsukamoto, Masaru Ishii
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Testing Metal–Oxide Varistors for HVDC Breaker Application
IEEE Transactions on Power Delivery, 2019There is growing interest in changing the power grid infrastructure. It is increasingly important to transport a large amount of renewable energy over long distances. To minimize losses, meshed dc-grids are needed but require the development of dc circuit breakers. Without it, a meshed grid cannot be operated. Actually different concepts of dc breakers
Maike Broker, Volker Hinrichsen
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Grain Resistivity and Conduction in Metal Oxide Varistors
1986Metal oxide varistors are ceramic devices with highly nonlinear current-voltage characteristics similar to back-to-back Zener diodes.1−4 Typical I-V characteristics for a metal oxide varistor at 77 K and for a small range of temperatures near 300 K are shown in Fig. 1. They are produced by sintering ZnO powder together with small amounts (1 to 10 mole %
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Der Metall‐Oxid‐Varistor (MOV)
Physik in unserer Zeit, 1986Elmar Ziegler, Reinhard Helbig
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