Results 231 to 240 of about 475,480 (267)

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 statistical analysis of metal oxide varistor current under distorted supply voltage conditions

Electrical Insulation Conference, 2014
Leakage current monitoring is still relied upon when on-site condition assessment or stability analysis of metal oxide varistors is to be conducted. The non-availability of adequate testing equipment, capable of directly measuring resistive component of ...
Pitshou N Bokoro, Ian R Jandrell
exaly   +2 more sources

Second-breakdown characteristics of metal-oxide varistors

Journal of Applied Physics, 1977
Several 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
openaire   +1 more source

Multi-factor ageing of metal oxide varistors

Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP'94), 2002
Localised 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, D.M. Ryder, R. Miller, R.M. Doone   +3 more
openaire   +1 more source

Microwave Sintering Technology for the Production of Metal Oxide Varistors

MRS Proceedings, 1990
ABSTRACTA 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, A. Pant, R. Sood, A. Ahmas, R.T. Holt   +4 more
openaire   +1 more source

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
openaire   +1 more source

Development of metal oxide varistor element for power systems

Proceedings of IEEE International Symposium on Industrial Electronics, 2002
A 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, C.K. Roy, P.K. Bhattacharya, T.K. Gangopadhyay   +3 more
openaire   +1 more source

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
openaire   +1 more source

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 ...
openaire   +1 more source

Sintering and microstructural development of metal oxide varistor ceramics

Materials Research Bulletin, 1993
Anomalous 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
openaire   +1 more source