Temperature-Dependent Self-Recovery of Electrical Trees in Silicone Rubber

GAO Jian; YAN Zhimin; LI Jianying; REN Zhigang; GUO Wei; PAN Zehua

doi:10.7652/xjtuxb202209019

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Temperature-Dependent Self-Recovery of Electrical Trees in Silicone Rubber

更新时间：2025-07-09

- Temperature-Dependent Self-Recovery of Electrical Trees in Silicone Rubber
- Vol. 56, Issue 9, Pages: 176-184(2022)
- 作者机构：
  
  1. 西安交通大学电气工程学院,西安,710049
  2. 国网北京市电力公司电力科学研究院,北京,100075
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202209019
  CLC： TM215
- Online First：10 September 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
GAO Jian, YAN Zhimin, LI Jianying, et al. Temperature-Dependent Self-Recovery of Electrical Trees in Silicone Rubber[J]. 2022, 56(9): 176-184.
DOI：

GAO Jian, YAN Zhimin, LI Jianying, et al. Temperature-Dependent Self-Recovery of Electrical Trees in Silicone Rubber[J]. 2022, 56(9): 176-184. DOI： 10.7652/xjtuxb202209019.

摘要

针对目前硅橡胶电树枝自恢复特性与机理尚不明确的问题

本文对不同温度(30 ℃～180 ℃)下硅橡胶(SiR)电树枝的自恢复特性及其机理展开研究。对SiR电树枝的自恢复与再生长过程进行观测

结合电树枝自恢复过程中SiR试样力学性能以及交联密度的变化

解释了SiR电树枝的自恢复机理。结果表明

在没有外施电磁场以及修复助剂的干预下

SiR电树枝的部分分支会逐渐退化并消失。自恢复过程表现出阶段性变化特征:第一阶段(0 h～72 h)

自恢复速率较高并与温度呈负相关; 第二阶段(72 h～432 h)

自恢复速率较低并与温度呈正相关; 第三阶段(432 h～600 h)

自恢复速率接近于0。不同阶段内自恢复速率的差异源于自恢复过程在不同阶段内主要驱动力的不同

第一阶段内的自恢复过程主要源于树枝通道内气体的冷却收缩及侧枝气体向主通道的流动

第二阶段内的自恢复过程主要源于树枝通道内气体的逸散以及通道壁的弹性收缩。温度升高会抑制树枝通道内气体的冷却收缩

但会增强气体的流动性以及通道壁的弹性回复能力

导致不同阶段内自恢复速率的温度特性有所差异。

Abstract

The self-recovery characteristics and mechanisms of electrical trees in silicone rubber(SiR)are still unclear

and are studied herein at different temperature(30 ℃-180 ℃). The self-recovery and regrowth of electrical trees in SiR are observed. The self-recovery mechanisms are explained in combination with the variation of mechanical characteristics and crosslinking density of electrical trees in SiR during the self-recovery. The results show that parts of branches in the electrical tree gradually degrade and finally disappear without the interventions of healing fillers and external electrical-magnetic fields. The self-recovery characteristics vary in different stages. In the first stage(0 h-72 h)

the rate of self-recovery is relatively high and has a negative correlation with temperature. In the second stage(72 h-432 h)

the rate of self-recovery is relatively low and has a positive correlation with temperature. In the third stage(432 h-600 h)

the rate of self-recovery is close to zero. The rate difference in different stages results from the difference in the primary inducement of self-recovery. In the first stage

the self-recovery mainly depends on the cooling shrinkage of gases in tree channels and the flow of gases from the side branches to the main channels. In the second stage

the self-recovery is mainly due to the loss of gases in channels and the elastic shrinkage of the channel walls. Increased temperature could hinder the cooling shrinkage of the gases in tree channels

while it can also intensify the flow of gases and elastic recovery of the channel walls

leading to the divergences in the temperature dependences of the self-recovery rate in different stages.

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