DC Electrical Tree Growth in Epoxy Resin and the Influence of the Size of Inceptive AC Trees
DC Electrical Tree Growth in Epoxy Resin and the Influence of the Size of Inceptive AC Trees
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DOI：
10.1109/tdei.2017.006544
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发表时间：
2017-06-01
影响因子：
3.1
通讯作者：
Rowland, Simon M.
中科院分区：
文献类型：
--
作者：
Iddrissu, Ibrahim;Zheng, Hualong;Rowland, Simon M.
电树枝传播是高电压聚合物绝缘中介电失效的前兆。树木生长已被广泛研究在AC条件下，但其行为下的DC还没有得到很好的理解。这项工作的目的是研究极性和启动缺陷大小对DC树传播的重要性。用经典的针-板电极测量了在+60 kV和-60 kV恒定直流电压下环氧树脂中的电树枝传播，但在直流试验前在较低的交流电压下获得了小的初始树枝（< 100 μ m）。实验结果表明，强极性依赖性。在任一极性中，初始AC树的长度对随后DC树的开始有重大影响。这是由于当缺陷大于空间电荷注入区时，缺陷会产生影响。因此，存在临界缺陷尺寸，其将加速取决于所讨论的聚合物/电极系统的空间电荷注入行为的DC绝缘的失效-这是高压资产管理的关键发现。
Electrical tree propagation is a precursor to dielectric failure in high voltage polymeric insulation. Tree growth has been widely studied under AC conditions, but its behavior under DC is not well understood. The aim of this work was to examine the importance of polarity and initiating defect size on DC tree propagation. Electrical tree propagation in epoxy resin under constant DC voltages of + 60 kV and -60 kV was measured in samples with classical needle-plane electrodes, but with small initial trees (< 100 mu m) incepted under lower AC voltages before the DC tests. Experimental results showed strong polarity dependence. In either polarity, the length of the initial AC tree had a major influence on the inception of the subsequent DC tree. The effect was attributed to the defect being influential if it is larger than the space charge injection region. As a consequence, there is a critical defect size that will accelerate failure of DC insulation dependent on space charge injection behavior of the polymer/electrode system in question - a critical finding for high voltage asset management.