多脉冲装置设计及其冲击特性研究

发布时间：2018-03-14 19:39

本文选题：多脉冲　切入点：肖特基势垒畸变　出处：《电瓷避雷器》2017年01期 　论文类型：期刊论文

【摘要】：为研究多脉冲电流冲击特性,设计一台十脉冲电流冲击设备,其主要由8/20μs波形发生器,高压开关以及由D触发器组成延时电路等组成,利用其对压敏电阻进行冲击试验,试验表明十脉冲冲击下,ZnO压敏电阻U_(1 mA)变化呈现初期快速减小,中期平缓,后期快速减小趋势。泄漏电流变化呈初期缓慢上升,中期进入平缓区,后期快速增大直至损坏。与单脉冲冲击下,泄漏电流变化规律相同,但泄漏电流变化的平缓区域远远小于单脉冲冲击下的平缓区域。通过对压敏电阻热行为分析发现,在十脉冲冲击下,ZnO压敏电阻内部晶粒热导率开始下降,部分热导性能较差的晶界首先由热平衡状态转入热不平衡状态,晶界区电荷量发生变化,最终伏安特性发生蜕变。
[Abstract]:In order to study the characteristics of multi-pulse current shock, a 10-pulse current shock device is designed. It is mainly composed of 8/20 渭 s waveform generator, high voltage switch and delay circuit composed of D flip-flop. The experimental results show that the change of ZnO varistor U _ S _ 1 Ma _ (A) shows a rapid decrease in the initial period, a gentle period in the middle period, and a fast decreasing trend in the later period. The leakage current changes slowly in the initial stage and enters the flat region in the middle stage. The variation law of leakage current is the same as that under single pulse impact, but the smooth region of leakage current change is much smaller than that under single pulse impact. The thermal behavior of varistor is analyzed. The grain thermal conductivity of ZnO varistor begins to decrease under the impact of ten pulses. Some of the grain boundaries with poor thermal conductivity change from the thermal equilibrium state to the thermal imbalance state at first, the charge content in the grain boundary region changes and the volt-ampere characteristic changes at last.
【作者单位】：南京信息工程大学中国气象局气溶胶与云降水重点开放实验室;南京信息工程大学大气物理学院;中国民用航空宁波空中交通管理站;
【基金】：国家重点基础研究发展计划(973计划)资助项目(编号:2014CB441405) 国家自然科学基金项目(编号:41175003) 江苏高校优势学科建设工程资助项目(PAPD)资助
【分类号】：TM86;TN782

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