Results 211 to 220 of about 10,701 (258)
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Thermal breakdown in ZnO-varistor ceramics
Physica Status Solidi (a), 1980Thermal breakdowns representing an essential mechanism for the lifetime limitation of ZnO-varistor ceramics are characterized with respect to the parameters of the breakdown point (especially breakdown temperature Tb) (for 21 °C as ambient temperature: Tb = 174 °C).
W. Brückner, W . Moldenhauer, D. Hinz
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Lifetime-Based Selection Procedures for DC Circuit Breaker Varistors
IEEE transactions on power electronics, 2022Zhi Jin Justin Zhang +7 more
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Varistor effect in semiconductor ferroelectrics
Technical Physics, 1997This paper treats the effect of an external field on the magnitude of potential barriers and the potential contour near a charged boundary between crystallites in polycrystalline ferroelectric semiconductors. It is shown that this effect depends on the mutual directions of the external field and the polarization in the ferroelectric bulk, and that the ...
A. N. Pavlov, I. P. Raevskii
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Ultra-high voltage SnO2 based varistors prepared at low temperature by two-step sintering
Journal of Alloys and Compounds, 2019In this research, full density, single phase microstructure (in the XRD and SEM detection limits), and fine-grained SnO2 varistors with an average grain size of 0.65 μm was acquired at low temperature by the two-step sintering technique.
M. Maleki Shahraki +5 more
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Hybrid Circuits, 1993
Various thick film varistor constructions were made and characterised: ‘sandwich’, ‘interdigitated’ and ‘segmented’ varistors. The varistor active layer thickness, the electrode surface value and shape were varied. The Ul characteristics of these varistors were compared mutually, and with the Ul characteristics of the smallest chip varistors.
O.S. Aleksić +3 more
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Various thick film varistor constructions were made and characterised: ‘sandwich’, ‘interdigitated’ and ‘segmented’ varistors. The varistor active layer thickness, the electrode surface value and shape were varied. The Ul characteristics of these varistors were compared mutually, and with the Ul characteristics of the smallest chip varistors.
O.S. Aleksić +3 more
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Electric power systems research, 2018
Nonuniform current distribution inside varistor ceramics is a key factor influencing its performance and failures. Therefore understanding, modeling and predicting of current distribution in varistor ceramics is of crucial significance.
Zumret Topčagić +2 more
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Nonuniform current distribution inside varistor ceramics is a key factor influencing its performance and failures. Therefore understanding, modeling and predicting of current distribution in varistor ceramics is of crucial significance.
Zumret Topčagić +2 more
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Photoconduction of ZnO-Bi2O3 varistors
Journal of Materials Science Letters, 1989Zinc oxide (ZnO) ceramics with a few mol % Bi203, CoO, MnO, Sb203, etc., as additives exhibit a high non-ohmic property in their voltage-current characteristics [1, 2], and therefore they are called varistors and are widely used for surge protection against transient voltage and powder overload [3].
T. Sekiya +3 more
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Varistor versus Environment: Winning the Rematch
IEEE Transactions on Power Delivery, 1986An unusual case of difficult application of surge protective devices was solved by field measurements with retrofit of protective devices suitable for the particular environment. Onsite measurements indicated that capacitor switching transients were causing excessive current surges in the varistors and fuses protecting the input to a thyristor motor ...
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ZnO Varistors: From Grain Boundaries to Power Applications
, 2021F. Greuter
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