Field-dependent charging phenomenon of HVDC spacers based on dominant charge behaviors
Field-dependent charging phenomenon of HVDC spacers based on dominant charge behaviors
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DOI：
10.1063/1.5096228
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发表时间：
2019-05-20
影响因子：
4
通讯作者：
He, Jinliang
中科院分区：
文献类型：
--
作者：
Li, Chuanyang;Lin, Chuanjie;He, Jinliang
间隔棒是用于支撑气体绝缘变电站或气体绝缘线路中高压导线的关键部件。间隔层表面电荷模式的分析仍然是一个困难的任务，这需要全面了解气固界面充电现象的物理机制。在这封信中，我们报道了直流应力下间隔层表面电荷积累模式的场依赖性。我们通过实验验证了这一发现，并进一步提出了一个基于不同电场下主导电荷输运行为的场依赖充电模型。结果表明，当电场应力为2.5kV/mm时，间隔层的带电特性主要由欧姆导电控制，当电场应力大于2.5kV/mm时，间隔层的带电特性主要由增强的气体电离控制，符合汤森定律。该模型的正确性得到了文献研究中表面电荷测量结果的验证，并提出了一种确定不同电场下电荷积累主导机制的方法。
Spacers are key components that are used to support high voltage conductors in gas-insulated substations or gas-insulated lines. The analysis of the surface charge patterns on spacers remains a difficult task, which requires a comprehensive understanding of the physical mechanism of the gas-solid interface charging phenomenon. In this letter, we reported a field dependent property of surface charge accumulation patterns on spacers under DC stress. We verified this finding through experiment, and further, we put forward a field-dependent charging model based on dominant charge transport behavior under different electric fields. It was found that the charging characteristics of the spacer are dominated by the Ohmic conduction from the volume below an electric field of 2.5kV/mm. When the electric field stress is higher than 2.5kV/mm, the charging property of spacers is dominated by the enhanced gas ionization according to Townsend's law. The correctness of this model was verified by surface charge measurement results in literature studies, and a method for determining the dominant mechanism of charge accumulation under different electric fields was proposed.