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中文摘要：
针对如何准确诊断ZnO压敏电阻老化的问题,提出了一种新的诊断方法——回复电压法,通过对ZnO压敏电阻试样进行不同程度的冲击老化试验,并采用多种诊断方法对试样在冲击前后的老化状态进行测量,发现回复电压法同传统的压敏电压以及放电残压变化率法所得的结论相吻合,且回复电压法的主要参数回复电压最大值以及中心时间常数在冲击后呈现下降趋势,这与SEM电镜扫描试验得出的压敏电阻晶粒平均尺寸下降,电导率上升的结论相一致,进一步证明了回复电压法诊断的及时有效性,这对提高ZnO压敏电阻的老化诊断准确度具有一定的参考价值。
英文摘要：
In order to accurately diagnose the degradation degree of ZnO varistor,a new method,return voltage measurement,is presented.Samples of ZnO varistors were impacted by impulse currents,and various diagnostic techniques are employed to investigate the degradation degree of those samples.It is proved that the conclusions drawn from return voltage measurement are consistent with the traditional varistor voltage（U1mA）and residual voltage method.Besides,two main parameters getting from the return voltage measurement appear to decrease sharply after the impacting process,which is also consistent with SEM experimental results：the average grain size decreases and the conductivity increases. The experimental results further prove the correctness of return voltage measurement,which has a certain reference value for improving the accuracy of ZnO varistor diagnosis.
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