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中文摘要：
ZnO压敏电阻连接在电路中工作时,两端一直承受交流负载电压的老化,为探究在多脉冲情况下,交流负载电压对ZnO压敏电阻的性能影响,采用幅值为20 k A、时间间隔为50 ms的8/20μs同时序冲击高压多脉冲对并联氧化锌压敏电阻元件进行冲击的同时施加幅值为385 V的工频交流电压模拟压敏电阻实际安装在电路上的真实工作环境。经过施加交流负载和不加交流负载的两组试验对比分析,得出结论：交流负载施加与否对初始压敏电压相同的两片压敏电阻并联的耐受多脉冲冲击次数没有影响,但会导致压敏电阻损坏效果不同;施加交流负载时,会导致ZnO压敏电阻发生燃烧,不加交流负载时,压敏电阻片这是爆裂而没有发生燃烧;如果两片压敏电阻的初始压敏电压存在差距,交流电压会加快压敏电阻的失效。
英文摘要：
In order to study the effect of AC voltage on ZnO varistors under multiply impulses, 8/20 μs multiply impulses are applied to Zno varistors with current amplitude of 20 k A. The time interval between continuous impulses is adjusted to 50 ms. As the same time, AC voltage with amplitude of385 V is applied to imitate the real work environment of Zno varistors. By the contrast of AC voltage and without AC Voltage, the result shows that, AC voltage has no influence to the impulse number of Zno varistors when U1 m A between the parallel ones are same, but would lead to different damage results; applying AC voltage would lead to the burning of Zno varistors. But when the difference of U1 m A between the parallel ones reaches to 10 V,AC voltage would accelerate the failure of Zno varistors.
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