During the last two decades, partial discharges (PDs) modelling methods have been used as a complement of insulation diagnosis systems of electrical assets. Finite-element-analysis models for simulating PDs in cavities within solid dielectric materials are reviewed and a novel model is presented, which combines the main advantages of electrostatic and electric current models. The theoretical background is presented and some limitations and restrictions are discussed. A case of study was implemented for three different ageing conditions and simulation results exhibit good agreement with reported values by other authors in the literature. An analysis of variations of PD behaviour with ageing as a function of temperature and pressure is briefly presented. It is concluded that more research is needed to include physical and chemical interactions on the void surface and that the cavity surface conductivity plays a fundamental role in the PD simulations at advanced ageing conditions.

在过去的二十年中，局部放电（PDs）建模方法已用作电力资产绝缘诊断系统的补充。审查了有限元分析模型，用于模拟固体介电材料中的空腔中的局部放电，并提出了一个新颖的模型，该模型结合了静电和电流模型的主要优点。介绍了理论背景并讨论了一些限制和限制。针对三种不同的老化条件进行了研究，模拟结果与文献中其他作者的报道值具有很好的一致性。简要介绍了PD行为随老化随温度和压力变化的变化。