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首页> 外文期刊>Applied Computational Electromagnetics Society journal >Fast Rise-Time Electromagnetic Pulse Protection Characteristics of ZnO Varistors
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Fast Rise-Time Electromagnetic Pulse Protection Characteristics of ZnO Varistors

机译：ZnO变阻器的快速上升电磁脉冲保护特性

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摘要

In order to study the response of ZnO varistors under the radiation of fast rise-time electromagnetic pulse, an experiment system is built composed of square wave pulse source, coaxial cable, coaxial fixture, attenuator, oscilloscope and insulating gas vessel. Electromagnetic pulse protection characteristics of ZnO varistors are tested and analyzed. Results show that: appearance of negative pulse in the responsive waveform means the completion of field-induced insulator-conductor phase transition for ZnO varistors. Peak value of responsive positive pulse decreases after phase transition, and the residual voltage is generally constant for different pulse strength and widths. The phenomenon of overshoot voltage is observed. Negative pulse is caused by the reflection of electromagnetic wave after the phase transition. The resistance of ZnO after phase transition is less than 50 Omega and decreases linearly along with the increase of incident voltage or field, which leads to a highly nonlinear current-voltage characteristic of ZnO varistors in the radiating electromagnetic environment. Sum of energy of positive and negative pulse keeps constant, which indicates that the weakened positive pulse is converted into negative pulse. So impact of negative pulse needs to be taken into consideration when ZnO varistors are used to protection against strong electromagnetic pulse.
机译：为了在快速上升时间电磁脉冲辐射下研究ZnO变阻器的响应，建立了实验系统，由方波脉冲源，同轴电缆，同轴夹具，衰减器，示波器和绝缘气体容器构成。测试和分析ZnO变阻器的电磁脉冲保护特性。结果表明：响应波形中的负脉冲的外观是指ZnO变阻器的场诱导的绝缘体导体相变。响应性正脉冲的峰值在相变后减小，并且残留电压通常是恒定的，用于不同的脉冲强度和宽度。观察到过冲电压的现象。负脉冲是由相变后电磁波的反射引起的。相变后ZnO的电阻小于50ω，随着入射电压或场的增加而导致ZnO压敏电阻的高度非线性电流 - 电压特性线性地降低。正负脉冲的能量和保持恒定，这表明弱化的正脉冲被转换成负脉冲。因此，当ZnO变阻器用于防止强电磁脉冲时，需要考虑负脉冲的影响。

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