Effect of Nano Filler Mixture on the Visual Aspect of Treeing Degradation in LDPE Based Composite

来源 :高电压技术 | 被引量 : 0次 | 上传用户:zzjokok
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
This paper deals with a digest on electrical treeing degradation in nanocomposite of magnesium oxide (MgO) added to a low-density polyethylene (LDPE). The objective is to elucidate the "visual" aspects of runaway stage of fi- nal treeing breakdown mechanisms, and to ensure that the existence of MgO filler itself is responsible for this aspect instead of voltage application changes. The "visual" aspect of treeing breakdown was investigated by applying ac ramp voltage with continuous rising speed of 0.5 kV/s. As soon as tree had been incepted, the voltage was kept constant to observe the tree propagation until breakdown. The tree propagations were also described by their fractal dimension. To ensure the responsibility of MgO filler on the "visual" aspect results, the experiment was repeated using the same rate of ac ramp voltage. However, as soon as tree had been incepted, the voltage was either increased or decreased to a constant value of mean tree inception voltage obtained from the preceding results to observe its propagation to breakdown. As a result, the tree inception voltage was increased with the filler concentration in LDPE. The filler is considered not only acted as a physical obstacle for tree to propagate, but also as a chemical obstacle in which the free electron might be trapped to cause difficulties for electron avalanche occurrence. This consideration could also be valid for tree propagation up to breakdown. During propagation, due to the filler, the tree structure is accompanied by more branches. Since the branches are closely placed each other, the tree tips become relatively uniform field compares to pure LDPE. This would produce the higher local breakdown strength at the tree tips, leads to the suppression of propagation. The "visual" aspect of breakdown could be achieved by applying voltage exactly at the inception level. After bridging the tree would not breakdown until a short period of time lag. Within this period, the tree channel will be eroded by internal flashover (IFO) and become thicker. MgO filler could still restrain the IFO at the small diameter; however there will be a maximum diameter above which the effect of MgO would be very small. Lastly, it is confirmed that the MgO filler itself excels to suppress the tree degradation instead of the voltage application changes. The polymer nanocomposite appears to be more resistive to treeing degradation than their base material.
其他文献
Group classification of quasilinear third-order evolution equations is given by using the classical infinitesimal Lie method, the technique of equivalence trans
更新摘要除了要解决传统的面向话题的多文档摘要的两个要求——话题相关性和信息多样性,还要求应对用户对信息新颖性的需求.文中为更新摘要提出一种基于热传导模型的抽取式摘
基于POD方法的理论基础与数学矩阵分析,通过引入随机场均值的相关矩阵及对均值相关矩阵的POD分解,阐述均值对随机场完整信号和脉动信号POD分解的影响机理。以双曲冷却塔模型
The fabrication of LPFG in single mode fiber (SMF) was fabricated using amplitude mask writing techniques. The birefringence effect of LPFG for sensing the tran
This paper describes a new framework for reusing hand-drawn cartoon clips based on language understanding approach. Our framework involves two stages: a preproc
为开展脉冲功率系统小型化研究,介绍了直线变压器驱动源的工作原理,阐述了其设计思想和关键技术,研制了以脉冲形成网络为初级脉冲形成单元、采用双边对称输入方式的4模块直线
视觉系统是菠萝采摘机械的关键部件之一,可为采摘终端提供待采果实的位置导航信息.考虑到菠萝果形较大,易于识别,以及系统应用于农业领域,需尽可能降低成本.该研究选取双目视
为了提高web缓存性能,在已有缓存替换算法的基础上加入预测机制,提出了一种面向社交网站(SNS)用户访问行为特征的预测替换算法.通过研究SNS的用户行为模型,引入预测对象集,减
Giemsa C-banding was applied to the chromosome complements of six diploid species belonging to six genera in Chrysanthemum sensu lato (Anthemideae) distributed
Combination of pressboard and mineral oil continues to be the choice of materials used as the insulation die- lectric media in large transformers. The purpose o