| 题名 | 重频纳秒脉冲下有机玻璃电树枝老化特性的研究; 重频纳秒脉冲下有机玻璃电树枝老化特性的研究 |
| 作者 | 1任浩,电工研究所 |
| 学位类别 | 硕士 |
| 答辩日期 | 2008-06-02 |
| 授予单位 | 中国科学院电工研究所 |
| 导师 | 1严萍,电工研究所 |
| 关键词 | 高压窄脉冲 有机玻璃 电树枝老化 应力裂隙 high voltage narrow pulse PMMA electrical tree stress fracture |
| 其他题名 | 重频纳秒脉冲下有机玻璃电树枝老化特性的研究 |
| 中文摘要 | 随着脉冲功率技术在国防科技及民用工业中的应用日益广泛，对脉冲电压下聚合物电老化问题的研究也越来越迫切。电树枝老化是聚合物电老化的主要方式，对其的研究主要在于影响因素、作用机理、试验方法以及抑制与防止方法的改进。本文设计了重复频率高压纳秒级窄脉冲条件下有机玻璃电树枝老化的试验系统，并对试验中的若干现象进行了研究。研究主要集中在电压等级及频率对电树枝的引发和生长特性的影响。 在电树枝的引发阶段，我们研究了纳秒级脉冲下有机玻璃内部电树枝起始电压随电压频率变化的规律。结果显示电树枝的最小起始电压随着频率的下降而下降，而平均起始电压则由于高频电压下的高分散性而并非单调递减。 在电树枝的生长阶段，本文从电树枝短期/长期引发率、电树枝的形态、电树枝长度、生长速度、分散性等角度出发，研究了脉冲条件下电压等级、频率以及材料结晶度等因素对电树枝生长的影响。这一阶段中我们还发现了脉冲条件下所特有的电致裂隙现象。 通过资料学习及试验验证，文章还浅析了电树枝引发和发展中各种因素起作用的机理，并在此基础上对后续试验的研究方向和可能遇到的问题提出了意见和建议。 With the increasingly widespread application of high pulsed power technology in national defense and civilian industries, the problems in research of polymer electrical ageing are more and more pressing. The electrical tree phenomenon is the main form of the electrical aging of the polymer. The investigation of the electrical tree in polymer mainly contains ageing factors, affecting mechanism, experimental methods and methods of suppression and prevention. In the paper we researched several phenomenon of electrical tree growing in pure PMMA material in repetitive nanosecond high electrical field pulse (fwhm 70ns). The experiments’ results showed the correlation between tree growth rate and the related factors such as voltage and frequency. In the initiation stage of electrical tree, we have studied the influence of nanosecond pulse voltage and frequency on electrical tree initiation and growth in PMMA. The results showed that the minimal initial voltage of electrical tree decreased as frequency decreased, while the average initial voltage doesn’t due to the electrical tree initial dispersancy under high frequency condition. Through the measurement of short /long-term initiation rate, tree shape, length, growth rate, and dispersancy, the influence of nanosecond pulse voltage, frequency and material crystallization on electrical tree growth is discussed. We also found the interested phenomenon of stress fracture inside the samples. By the learning and experimental verification, the paper also presented the discussion of electrical tree initiation and growth mechanism, and on the basis of this, we gave some opinions and suggestions on follow-up experiments and possible problems might encountered. |
| 语种 | 中文 |
| 公开日期 | 2010-10-18 |
| 页码 | 61 |
| 分类号 | TM85 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.iee.ac.cn/handle/311042/7053]  |
| 专题 | 电工研究所_其他部门_其他部门_硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 1任浩,电工研究所. 重频纳秒脉冲下有机玻璃电树枝老化特性的研究, 重频纳秒脉冲下有机玻璃电树枝老化特性的研究[D]. 中国科学院电工研究所. 2008. |
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