Electrical Tree Initiation and Growth in LDPE Under Negative DC Fields
Electrical Tree Initiation and Growth in LDPE Under Negative DC Fields
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负直流电场下 LDPE 电树的引发和生长
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
H. Zheng
中科院分区：
文献类型：
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作者：
F. Liu;S. Rowland;V. Peesapati;H. Zheng
研究了针-板结构低密度聚乙烯（LDPE）在直流负电场作用下的电树枝的形成和生长。在针被正激励（正DC场）的情况和针被负激励（负DC场）的情况之间已经发现许多差异。在后者树引发可以发生在一个更广泛的电压幅值范围内，并有一个较短的启动长度。阴性树也往往比阳性树更快地启动，并观察到相当长的传播立即启动。此外，有两个极性之间的局部放电信号的差异。这些区别被认为是由空穴注入和电子注入之间的性质差异以及随后针尖周围聚合物中的空间电荷积累引起的。
Electrical tree initiation and growth in low-density polyethylene (LDPE) with a needle-plane geometry under negative DC fields was investigated in this work. Many differences have been found between the cases of the needle being energized positive (positive DC fields) and those in which the needle is negative (negative DC fields). Tree initiation in the latter could occur under a wider range of voltage magnitudes and had a shorter initiation length. Negative trees also tended to initiate more quickly than positive trees, and considerable length propagation was observed to immediately follow the initiation. Furthermore, there were differences in partial discharge signals between the two polarities. These distinctions are thought to be caused by the differences in nature between hole injection and electron injection and the subsequent space charge accumulation in the polymer around the needle tip.