Electrical tree structures generated by the ab-initio discharge-avalanche model

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI:10.1109/CEIDP.1999.807878

L. Dissado, N. Wise, J. Fothergill

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引用次数: 2

Abstract

Initially the discharge-avalanche model for electrical tree formation treated the local Poisson fields as being derived from the applied Laplace field via a modification factor that was regarded as a random variable in time and space. Recently we have removed this approximation by calculating the local Poisson fields from the space charge arrangement produced by discharges in the tree tubules and avalanches in the surrounding polymer. This "ab-initio" version of the model has now been fully implemented. The ac-cycle is divided into 16 time segments. In each time segment tube-discharges are allowed to occur if the potential difference along a tube is greater than an onset threshold. Positive space charge is regarded as being deposited on the tube walls in the form of positive ions. Negative charge is allowed to penetrate the polymer where it can be used to initiate avalanches and thereby generate damage. The avalanches compete with a field dependant mobility in rearranging the charge around the tree tips.

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由从头算放电雪崩模型生成的电树结构

最初，电树形成的放电-雪崩模型将局部泊松场视为由应用的拉普拉斯场通过修正因子推导而来，修正因子被视为时间和空间上的随机变量。最近，我们通过计算树状小管放电和周围聚合物雪崩产生的空间电荷排列的局部泊松场，消除了这种近似。这个“从头开始”版本的模型现在已经完全实现了。交流周期分为16个时间段。如果沿管的电位差大于起始阈值，则允许在每个时间段内发生管放电。正空间电荷被认为以正离子的形式沉积在管壁上。负电荷被允许穿透聚合物，在那里它可以被用来引发雪崩，从而产生损害。雪崩在重新排列树梢周围的电荷时，与磁场依赖的机动性竞争。

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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1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)

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