Results 131 to 140 of about 240 (181)

Nano-enabled metal oxide varistors

IEEE Transactions on Dielectrics and Electrical Insulation, 2009
Zinc oxide based metal oxide varistors (MOV) are widely used electrical surge protection components. The design of modern high power, high-density electronic systems necessitate the need for smaller footprint, higher current density and higher nonlinearity MOVs.
Daniel Tan, Karim Younsi, Yingneng Zhou, Patricia Irwin, Yang Cao   +4 more
openaire   +1 more source

Surge ageing of metal oxide varistors

2015 IEEE Electrical Insulation Conference (EIC), 2015
The objective of this paper is to analyze the ageing of metal oxide varistors (MOV) due to surges by the changes of the nonlinear behavior. The surge arrester installed in the field is submitted to the lightning stress superposed to the power frequency voltage, and so, submitted to an ageing process due to both cumulative stresses.
Credson de Salles, Manuel L. B. Martinez, Álvaro A. A. de Queiroz   +2 more
openaire   +1 more source

Electrothermal and Overload Performance of Metal-Oxide Varistors

IEEE Transactions on Power Delivery, 2020
The energy absorption capability of metal-oxide varistors, decidedly influenced by the electrothermal processes occurring within their microstructures, is a vital parameter for the effective surge protection. This paper proposes a numerical model for the simulation of the electrothermal phenomena occurring in metal-oxide varistors.
Zumret Topcagic, Miha Mlakar, Thomas E. Tsovilis   +2 more
openaire   +1 more source

Simple model of metal oxide varistor for Pspice Simulation

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, 2004
Metal oxide varistors (MOVs) are commonly used to suppress transients in many applications, such as industrial process measurement and control instrumentation, when exposed to electromagnetic interference. Varistors symmetrical, sharp breakdown characteristics enable them to provide transient suppression performance.
exaly   +2 more sources

Frequency limitation of metal-oxide varistors

International Journal of Electronics, 1992
The frequency possibilities of metal-oxide varistors are investigated. An expression is deduced for the limiting frequency f o of their application. It is also expressed in terms of the catalogue data of commercial varistors or by means of the parameters or the ceramic material. An evaluation of the f o of ZnO, SnO2 and SrTiO3 varistors is made.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

Surface flashovers on metal-oxide varistor blocks

ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132), 2002
Extensive studies have been made of surface flashovers on varistor blocks using multipulse (MP currents which simulate multiple stroke lightning ground flashes. The MP results are compared with those obtained with single-pulse (SP) currents and with high temporary overvoltages (TOV) at 50Hz. The blocks used were mostly of 5kA rating as commonly used in
Darveniza Mat, Saha Tapan K.
openaire   +2 more sources

Varistor Voltage Behavior of Metal Oxide Varistors Stressed by Electromagnetic Pulse

2024 IEEE Joint International Symposium on Electromagnetic Compatibility, Signal & Power Integrity: EMC Japan / Asia-Pacific International Symposium on Electromagnetic Compatibility (EMC Japan/APEMC Okinawa)
Naoyuki Tsukamoto
exaly   +2 more sources