Evolution of Partial Discharges during Early Tree Propagation in Epoxy Resin
Evolution of Partial Discharges during Early Tree Propagation in Epoxy Resin
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DOI：
10.1109/tdei.2017.006731
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发表时间：
2017-10-01
影响因子：
3.1
通讯作者：
Iddrissu, Ibrahim
中科院分区：
文献类型：
--
作者：
Lv, Zepeng;Rowland, Simon M.;Iddrissu, Ibrahim
电树枝生长是高电压聚合物绝缘中介电击穿的前兆。局部放电（PD）与电气树传播有着密切的关系，可以用来了解老化过程，并作为资产管理的诊断工具。在本文中，它表明，PD模式的变化，通过树木生长的早期阶段，并考虑这些变化，使深入了解树木生长的过程。在这里，树已经生长在环氧树脂中，在15 kV峰值AC下，具有2 mm间隙的针-平面几何形状。PD相位分辨模式可以被认为是众所周知的海龟状和翅膀状PD模式的组合。当树木伸展其长度时，可以看到翼状图案，并且最大放电幅度与生长分支的最大长度几乎呈线性关系。放电释放的能量和树木生长所需的汽化能量的比较支持的建议，翼状图案对应于PD负责的树木的长度增长。树木生长的机制的影响被认为是。结果表明，资产管理人员可以使用局部放电分析来区分树木生长的不同阶段，为优化高压工厂管理和更换提供了一个有价值的预测工具。
Electrical tree growth is a precursor to dielectric breakdown in high voltage polymeric insulation. Partial discharge (PD) has a close relationship with electrical tree propagation and can be both used to understand the aging process, and as a diagnostic tool for asset management. In this paper it is shown that PD patterns change through the early stages of tree growth, and consideration of these changes gives insight into the processes of tree growth. Here, trees have been grown in epoxy resin in needle-plane geometries with 2 mm gaps, at 15 kV peak AC. The PD phase-resolved pattern can be regarded as a combination of the well-known turtle-like and wing-like PD patterns. As a tree extends its length, a wing-like pattern is seen and the maximum discharge magnitude has an almost linear relationship with the maximum length of the growing branch. Comparison of the energy released by discharges and the vaporization energy needed for tree growth supports the proposal that the wing-like pattern corresponds to PDs responsible for growth in length of the trees. Implications for mechanisms for tree growth are considered. Results suggest that asset managers may be able to use partial discharge analysis to distinguish different stages of tree growth, providing a valuable prognostic tool for optimising high voltage plant management and replacement.