Nonmonotonic Variation Mechanism of Electrical Tree Shapes in XLPE With Temperature Increase

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2026-10-01 Epub Date: 2026-06-17 DOI:10.1109/TDEI.2026.3704524

Kang He;Jiahong He;Bingtuan Gao

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引用次数: 0

Abstract

Electrical tree shapes show a “branch-bush-branch” nonmonotonic variation with temperature increase, related to the dielectric aggregation state and the Young’s modulus. An electric and stress field-driven electric tree model to explain this nonmonotonic variation is proposed in this article. Simulations and experiments at

$30~^{\circ }$

$60~^{\circ }$

C, and

$90~^{\circ }$

C are carried out to analyze the effect of the Young’s modulus, physical fields, and driving energies on the tree shapes. At

$30~^{\circ }$

C, the tree is branch-shaped because the electric field concentrates at the tree tips and is the dominant factor driving the tree growth. At

$60~^{\circ }$

C, the tree is bush-shaped because the growth energy threshold decreases, and high electric field zones cover the lateral walls of the tree channel. The electric field remains the dominant driving factor. At

$90~^{\circ }$

C, the tree is branch-shaped because the strain energy significantly increases and the stress field becomes the dominant factor. Therefore, the analysis of the physical fields and energies can effectively reveal the mechanism of tree shape nonmonotonic variation with temperature increase.

查看原文本刊更多论文

交联聚乙烯电树形状随温度升高的非单调变化机理

随着温度的升高，电树形状呈现出“枝-丛-枝”的非单调变化，这与介电聚集态和杨氏模量有关。本文提出了一个电场和应力场驱动的电树模型来解释这种非单调变化。在$30~^{\circ}$ C、$60~^{\circ}$ C和$90~^{\circ}$ C下进行了模拟和实验，分析了杨氏模量、物理场和驱动能量对树形的影响。在$30~^{\circ}$ C时，由于电场集中在树尖，这是驱动树生长的主要因素，因此树呈树枝状。在$60~^{\circ}$ C处，由于生长能量阈值降低，树形呈灌木状，高电场区覆盖了树形通道的侧壁。电场仍然是主要的驱动因素。在$90~^{\circ}$ C处，由于应变能显著增加，应力场成为主导因素，树呈树枝状。因此，对物理场和能量的分析可以有效地揭示树形随温度升高非单调变化的机理。

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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来源期刊

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.