Characteristics and mechanisms of surface charge accumulation on a cone-type insulator under dc voltage
Characteristics and mechanisms of surface charge accumulation on a cone-type insulator under dc voltage
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DOI：
10.1109/tdei.2012.6148513
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发表时间：
2012-02
影响因子：
3.1
通讯作者：
Qiang Wang;Guixin Zhang;Xinxin Wang
中科院分区：
文献类型：
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作者：
Qiang Wang;Guixin Zhang;Xinxin Wang
为了研究锥型绝缘子表面电荷积聚现象，建立了基于静电探针法的锥型绝缘子表面电荷测量系统。测量了锥型绝缘体表面电位分布，并在表面电荷法三维场计算的基础上计算了锥型绝缘体表面电荷分布。比较了不同电压持续时间和电压幅值下的电荷分布特性。结果表明，在120 min后，电荷积累达到稳定状态。观察到阈值电压效应，即除非施加的电压达到一定值，否则电荷很少积累。讨论了电荷积累的机理。表面导电和体导电似乎并不主导绝缘体上的电荷积累。气体中的局部放电可能是表面电荷的主要来源。
In order to study the phenomenon of surface charge accumulation on cone-type insulators, a surface charge measuring system is established, based on the electrostatic probe method. The surface potential distributions on a cone-type insulator are measured and the charge distributions are calculated based on the 3D field calculation by the surface charge method. The characteristics of charge distributions are compared under different voltage durations and voltage amplitudes. The results show that the charge accumulation comes to a steady state after 120 min. A threshold voltage effect is observed that charges seldom accumulate unless the applied voltage reaches a certain magnitude. The mechanisms of charge accumulation are discussed. The surface conduction and volume conduction do not seem to dominate the charge accumulation on the insulator. Partial discharges in gas may be the main sources of surface charges.