An Electric and Stress Field-Driven Electrical Tree Growth Model

IF 2.9 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Kang He;Jiahong He;Yijun Zhou;Bingtuan Gao
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引用次数: 0

Abstract

Electrical trees have different shapes and growth rates under different voltage conditions. This article proposes an electric and stress field-driven electrical tree simulation model. The stress field describes the gas expansion of the partial discharge (PD) process. This model introduces the driving energy to determine the tree shape according to multiphysical fields instead of controlling the tree shape manually by artificial parameters. The electrical tree simulations and experiments were carried out to analyze the electric and stress field distributions under 11- and 15-kV voltages. The tree under 11 kV is branch-shaped (fractal dimension = 1.33), with the electric and stress fields concentrated at the tree tips. Meanwhile, a significant densification effect of the electric field replaces the concentration effect and causes a bush-shaped tree (fractal dimension = 1.72) under 15 kV. The tree-driving energy during tree growth under 15 kV constantly decreases faster than 11 kV. Consequently, the tree length under 15 kV is 69% shorter than 11 kV due to the decrement of the driving effect of the stress field. The proposed model explains the geometric shapes and growth rates of electrical trees under different voltages.
一个电场和应力场驱动的电树生长模型
电树在不同的电压条件下具有不同的形状和生长速率。本文提出了一个电场和应力场驱动的电树仿真模型。应力场描述了局部放电(PD)过程中的气体膨胀。该模型引入驱动能量,根据多物理场来确定树形,而不是通过人工参数来手动控制树形。通过电树仿真和实验,分析了11和15 kv电压下的电场和应力场分布。11kv下的采油树呈枝状,分形维数为1.33,电场和应力场集中在树梢处。同时,电场的显著致密化效应取代了浓度效应,在15 kV下形成灌木状树形,分形维数为1.72。15 kV下树木生长过程中的驱动能量不断下降,下降速度快于11 kV。结果表明,由于应力场的驱动作用减弱,15 kV下的采油树长度比11 kV下的采油树长度短69%。该模型解释了不同电压下电树的几何形状和生长速率。
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来源期刊
IEEE Transactions on Dielectrics and Electrical Insulation
IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程:电子与电气
CiteScore
6.00
自引率
22.60%
发文量
309
审稿时长
5.2 months
期刊介绍: Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.
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