Results 201 to 210 of about 395,154 (260)

Repetitive Impulse Withstand Performance of Metal–Oxide Varistors

IEEE Transactions on Power Delivery, 2017
This 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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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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Ageing of metal oxide varistors due to surges

2011 International Symposium on Lightning Protection, 2011
Surge arresters are exposed to a series of stresses that trigger changes in their nonlinear behaviors. This paper deals with the ageing of metal oxide varistors concerning the stresses associated to high current short duration surges. The ageing of the samples is evaluated by analyzing the evolution of the resistive component of the leakage current ...
Credson de Salles, Manuel L. B. Martinez, Alvaro Antonio Alencar de Queiroz   +2 more
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Long-time polarization currents in metal-oxide varistors

Journal of Applied Physics, 1976
The 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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Metal oxide varistors as surge suppressors

1995 International Conference on Electromagnetic Interference and Compatibility (INCEMIC), 2002
High voltage transients and surges are produced due to lightning, inductive load switching, and spikes or electrical noise on power lines. These voltage surges can be as high as 6 kV and the transient period can vary from a few microseconds to milliseconds. The frequencies of these surges vary randomly depending upon the source voltage.
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Experimental Improvements Concerning the Thermal Manufacturing Parameters of a new Metal Oxide Varistor Material

2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2018
Protection of any sensitive piece of electric or electronic equipment against accidental overvoltage occurrence (mostly lightning strokes applied to power networks) is a constant concern for the power electronics domain.
B. Filip, Flaviu Mihai Frigura-Iliasa, D. Vatau, M. Frigura-Iliasa, P. Andea, Ionel FlorinBalcu   +5 more
semanticscholar   +1 more source

A ZnO varistor derived from metal oxide diffusion

Journal of Physics D: Applied Physics, 1989
Non-ohmic characteristics of ZnO varistors are obtained by diffusing Bi2O3 and/or Sb2O3 into a ZnO-based matrix. The varistors derived from metal oxide diffusion have a smaller non-linearity parameter, lower threshold field, larger dielectric constant and larger dissipation factor than conventionally processed varistors.
Bi-Shiou Chiou, Tzuu-Chian Chen, Jenq-Gong Duh   +2 more
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Metal oxide varistor-A multijunction thin-film device

Applied Physics Letters, 1974
The physical origin of the highly nonlinear current-voltage relation in metal oxide varistors is shown to be consistent with Fowler-Nordheim tunneling.
Lionel M. Levinson, H. R. Philipp
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Tunneling of photoexcited carriers in metal oxide varistors

Journal of Applied Physics, 1975
ZnO-based ceramic varistors exhibit photocurrents which vary in a highly nonlinear manner with applied voltage. It follows that varistor behavior is controlled by electrical barriers at the ZnO-grain–intergranular-layer interface.
H. R. Philipp, Lionel M. Levinson
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Barrier voltage measurement in metal oxide varistors

Journal of Applied Physics, 1976
A 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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