Influence of electrode separation on electrical treeing in a glassy epoxy resin
Influence of electrode separation on electrical treeing in a glassy epoxy resin
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电极间距对玻璃状环氧树脂中电树的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Ningyu Jiang
中科院分区：
文献类型：
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作者：
Hualong Zheng;S. Rowland;Ningyu Jiang
研究了在峰值电压为15kv、50hz的固定交流应力下，电极分离对针平面玻璃环氧树脂中电树的影响。在电极分离为1mm、2mm、4mm和6mm的样品中比较电树的生长情况。树起始时间及其分布表明，当电极间距大于4 mm时，树起始机制发生了变化。随后的树木生长不受电极分离的影响。这些树是丝状的不导电类型，没有典型的失控到崩溃的特征。相反，树沿针轴的繁殖已被发现遵循与电极分离无关的速率。这意味着丝状树的生长并不受树梢前电场的改变所支配，尽管这一结论与现有的树木生长模型相矛盾。在细丝树完全穿过电介质后，击穿不会迅速发生，但仍然主要由穿过样品的平均电场决定。
The influence of electrode separation on electrical treeing in a glassy epoxy resin of needle-plane geometry has been studied under a fixed 50 Hz AC stress of 15 kV peak voltage. Growth of electrical trees is compared between samples of 1 mm, 2 mm, 4 mm and 6 mm electrode separation. The tree inception times and their distributions imply a change of mechanism for tree initiation when the electrode separation is above 4 mm. Subsequent tree growth was not affected by electrode separation. The trees were of the filamentary non-conductive type and did not feature a classical runaway to breakdown. Rather, tree propagation along the needle axis has been found to follow a rate independent of electrode separation. This implies that the filamentary tree growth is not dominated by modification of the electrical field in front of the tree tips, although such a conclusion is in conflict with existing treeing models. Breakdown does not occur rapidly after a filamentary tree fully crosses the dielectric, but is still primarily determined by the average electrical field across the sample.