Voltage Response of ZnO Varistors to 8/20 µs Surge Current

Zhen Ya Lu; Zhi Wu Chen; Feng Jin Yang

doi:10.4028/www.scientific.net/KEM.280-283.285

Paper Titles

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Grain Size Effects of SnO₂ Varistor Induced by Doping Pr
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Antistatic Ceramic Tiles Modified by Sb-Doped SnO₂
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Preparation and Photoluminescence Properties of Quantum Size Zinc Oxide Colloids
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Voltage Response of ZnO Varistors to 8/20 µs Surge Current
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Nonlinear Electrical Properties of (Sc, Ta) Doped TiO₂ Varistor Ceramics
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Ag Nanoparticle Enhanced Photocatalytic Activity of Rutile TiO₂ Films Prepared by Electrostatic Self-Assembly Method
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The Role of Niobium in (Ca, Si, Ce, Nb)-Doped TiO₂ Varistors
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Effect of La₂O₃ and CeO₂ on Nb₂O₅ Doped TiO₂ Ceramic Varistors
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 280-283Voltage Response of ZnO Varistors to 8/20 µs Surge...

Voltage Response of ZnO Varistors to 8/20 µs Surge Current

Abstract:

The voltage response of ZnO varistors to 8/20 µs surge current was investigated. The observed frontal spikes on the residual voltage waveforms are caused by the ignition gap, and no frontal spike was observed when a thyristor was used as the discharge trigger. The rear part of the waveform is determined by the damping coefficient of the RLC-circuit. Near the critical point, the residual voltage waveform changes from non-oscillating attenuation modes to distinct across zero oscillating modes along with the increase of the peak current, but there will be no oscillation happen when a thyristor is used as the discharge trigger. The residual voltage peak is not synchronized with the current peak, and the voltage peak is leading, implying that the ZnO varistor appears to be inductive. According to the experiment results, it can be reasonably explained that the voltage peak leading phenomenon is attributed to the transient skin effect of the varistor materials.