Measurements of partial discharge (PD) activity are a commonly used technique to diagnose the health of insulation material within high voltage plant. The definition of PD is relatively broad, it is generally defined as a localized or confined discharge within an insulating medium [1]. Due to the high electric breakdown strength of insulation materials, PDs typically occur within low density defects in the system. One family of defects which has received significant research attention is air-filled voids, typically spherical or cylindrical, surrounded by solid dielectric material. Experiments have typically used a ‘sandwich’ technique to fabricate cylindrical voids, using three slabs of material with a circular hole drilled into the central slab. The slabs are then pressed together and placed between parallel plate electrodes. A common dielectric material used to fabricate cylindrical voids is LDPE [2]. By injecting air through a syringe before the curing process spherical voids have been fabricated in epoxy resins [3,4] and silicone rubber [5].

中文翻译：

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局部放电现象建模

局部放电 (PD) 活动的测量是诊断高压设备内绝缘材料健康状况的常用技术。局部放电的定义比较宽泛，一般定义为绝缘介质内的局部或局限放电[1]。由于绝缘材料的高电击穿强度，局部放电通常发生在系统中的低密度缺陷中。一类受到大量研究关注的缺陷是充满空气的空隙，通常为球形或圆柱形，被固体介电材料包围。实验通常使用“三明治”技术来制造圆柱形空隙，使用三块材料板，在中心板上钻一个圆孔。然后将平板压在一起并放置在平行板电极之间。用于制造圆柱形空隙的常用介电材料是 LDPE [2]。通过在固化过程之前通过注射器注入空气，在环氧树脂 [3,4] 和硅橡胶 [5] 中制造了球形空隙。