Abstract This paper presents the investigation on surface discharge behavior of various dielectric samples under DC. It sequentially develops the knowledge base for the study and analysis of the partial discharge (PD) defect with the goal of PD defect identification under DC. In order to facilitate this, the material properties of the dielectric are measured. Finite Element (FEM) simulation is used to obtain the preliminary estimates of the electric field and dielectric properties that concern partial discharge behavior. The DC-PD tests performed on the surface dielectric samples demonstrate a highly plausible behavior based on simulation results and other literature. It also displays a great degree of similarity towards the AC surface discharge behavior. The paper concludes by presenting novel partial discharge fingerprints for the surface PD defect that will aid in defect identification under HVDC.

中文翻译：

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电介质表面直流局部放电的研究：机制、模式和与交流电的相似之处

摘要 本文研究了各种介电样品在直流下的表面放电行为。它以直流下局部放电缺陷识别为目标，依次开发了局部放电 (PD) 缺陷研究和分析的知识库。为了促进这一点，测量了电介质的材料特性。有限元 (FEM) 模拟用于获得涉及局部放电行为的电场和介电特性的初步估计。基于模拟结果和其他文献，对表面介电样品进行的 DC-PD 测试证明了一种非常合理的行为。它还显示出与交流表面放电行为的高度相似性。