Effect of small metal particles on ageing of epoxy insulation

ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132) Pub Date : 1998-06-22 DOI:10.1109/ICSD.1998.709328

M. Lakner, Jakob Rhyner, D. Sologuren

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引用次数: 3

Abstract

The electric performance (breakdown strength, ageing) of industrially manufactured insulation materials is usually far worse than that of laboratory made samples. The main reason of this discrepancy is commonly attributed to various kinds of impurities as, e.g., small metal particles, introduced by the large scale manufacturing process. We have intentionally introduced small elongated metal particles with well defined shape (length varying from 0.1 to 1 mm, diameter from 10 to 100 /spl mu/m) into alumina-filled epoxy insulation, oriented in the electric field direction. We have performed accelerated ageing tests at elevated ac electric fields between 10 and 28 kV/mm. The dependence of the time-to-breakdown as a function of the applied electric field and the particle size can be understood in terms of a field enhancement at the particle ends, leading to charge injection. We find a simple scaling relation between the lifetime and the injected space charge.

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小金属颗粒对环氧绝缘老化的影响

工业制造的绝缘材料的电性能(击穿强度、老化)通常远不如实验室制造的样品。这种差异的主要原因通常归因于各种杂质，例如，大规模制造过程中引入的小金属颗粒。我们有意将形状明确的细长小金属颗粒(长度从0.1到1mm不等，直径从10到100 /spl mu/m不等)引入到氧化铝填充的环氧绝缘中，并在电场方向上定向。我们在10至28千伏/毫米的高架交流电场中进行了加速老化试验。击穿时间作为外加电场和粒子大小的函数的依赖关系可以理解为粒子末端的场增强，导致电荷注入。我们发现了寿命与注入空间电荷之间的简单标度关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98CH36132)

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