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A generalized approach to partial discharge modeling

机译:局部放电建模的通用方法

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摘要

An important tool for improving the reliability of HV insulation systems are partial discharge (PD) measurements. The interpretation of such measurements aims at extracting from the measured data information about insulation defects which then are used for estimating the risk of insulation failure of the equipment. Because the physical understanding of PD has made substantial progress in the last decade, it can now be exploited to support interpretation. In this paper a concept is presented which merges the available physical knowledge about various PD types into a generalized model which can be applied to arbitrary insulation defects. This approach will be restricted to PD of the streamer type in gases and at gas-insulator interfaces which cover a large fraction of the cases encountered in technical insulation systems. The generalized model allows us to derive approximate relations between defect characteristics, insulation design parameters and test conditions on one side, and measurable PD characteristics on the other. The inversion of these relations yields rules for extracting defect information from the PD data. The application of the generalized model is illustrated by two simple examples, namely, spherical voids in an insulator and electrode protrusions in SF/sub 6/.
机译:改善高压绝缘系统可靠性的重要工具是局部放电(PD)测量。对此类测量的解释旨在从测量的数据中提取有关绝缘缺陷的信息,然后将其用于估算设备绝缘故障的风险。由于对PD的物理理解在过去十年中取得了实质性进展,因此现在可以利用它来支持解释。在本文中,提出了一个概念,该概念将有关各种PD类型的可用物理知识合并到可应用于任意绝缘缺陷的通用模型中。这种方法将仅限于气体和气体绝缘体接口中流光类型的PD,这涵盖了绝大部分技术绝缘系统中遇到的情况。通用模型使我们能够一方面导出缺陷特征,绝缘设计参数和测试条件之间的近似关系,另一方面获得可测量的PD特性之间的近似关系。这些关系的反转产生了用于从PD数据中提取缺陷信息的规则。通用模型的应用通过两个简单的示例进行说明,即绝缘体中的球形空隙和SF / sub 6 /中的电极突起。

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