The Influence of an Air Gap at the Needle/Polymer Interface on Electrical Tree Growth
The Influence of an Air Gap at the Needle/Polymer Interface on Electrical Tree Growth
复制标题
针/聚合物界面处的气隙对电树生长的影响
DOI：
10.1109/icempe.2019.8727391
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Z. Lv
中科院分区：
文献类型：
--
作者：
H. Zheng;S. Rowland;F. Liu;Z. Lv
在低密度聚乙烯（LDPE）中研究了金属针尖和聚合物之间的空气间隙对电树枝生长的影响。实验研究了$115\ \boldsymbol{\mu} \mathbf{m}$、\ 212\ \boldsymbol{\mu} \mathbf{m}$和$1037 \boldsymbol{\mu} \mathbf{m}$的间隙。在这些空气间隙内测量不同类型的电晕放电。在空气间隙为115\ \boldsymbol{\mu} \mathbf{m}$的样品中发现了加速的树枝化击穿。在这种情况下，流光电晕的幅度略高于最大局部放电（PD）在树的生长过程中的无间隙样品。与此相反，较低的电晕放电幅度与较大的气隙，和电树逐渐停止传播到反电极，并发展成松枝树结构。这项工作突出了电树之间的差异，有效地从金属电极直接接触的聚合物和电晕源的点。
The impact of air gaps between a metallic needle tip and the polymer on electrical tree growth has been studied in low density polyethylene (LDPE). Gaps of $115\ \boldsymbol{\mu} \mathbf{m},\ 212\ \boldsymbol{\mu} \mathbf{m}$ and $1037 \boldsymbol{\mu} \mathbf{m}$ have been experimentally investigated. Corona discharges of different types were measured within those air gaps. Accelerated treeing to breakdown was found in the sample with a $115\ \boldsymbol{\mu} \mathbf{m}$ air gap. In this case the streamer coronas were slightly higher in magnitude than the maximum partial discharge (PD) during the tree growth in the no-gap sample. In contrast, lower corona discharge magnitudes were associated with larger air gaps, and electrical trees gradually stopped propagating to the counter electrodes and developed into pine-branch tree structures. This work highlights the differences between electrical trees that effectively grew from a metallic electrode in direct contact with the polymer and a point of corona source.