Mechanical Properties and Breakage Characteristics of Composite Insulator Sheds in Island

XIE Siyang; ZHOU Mi; CHEN Lincong; HUANG Huan; SONG Shinan; WANG Jianguo

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Mechanical Properties and Breakage Characteristics of Composite Insulator Sheds in Island

更新时间：2025-12-08

- Mechanical Properties and Breakage Characteristics of Composite Insulator Sheds in Island
- Vol. 47, Issue 5, Pages: 1824-1830(2021)
- 作者机构：
  
  1. 武汉大学电气与自动化学院
  2. 海南电网有限责任公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 May 2021，
  
  Published：2021
- 稿件说明：
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XIE Siyang, ZHOU Mi, CHEN Lincong, et al. Mechanical Properties and Breakage Characteristics of Composite Insulator Sheds in Island[J]. 2021, 47(5): 1824-1830.
DOI：

XIE Siyang, ZHOU Mi, CHEN Lincong, et al. Mechanical Properties and Breakage Characteristics of Composite Insulator Sheds in Island[J]. 2021, 47(5): 1824-1830. DOI：

摘要

海岛复合绝缘子运行在盐含量高、湿度高、日照辐射强烈的环境

其老化状态是令人关心的问题

开展复合绝缘子伞裙老化特征评价对于掌握硅橡胶老化状态十分重要。为此选取了在海南岛运行的39支不同电压等级、运行年限和生产厂家的复合绝缘子开展了伞裙力学性能和破损特征的测试评价

通过电子万能试验机测定了伞裙的拉伸强度和断裂伸长率

分析了运行不同年限绝缘子伞裙的力学性能特征及变化规律。结果表明:复合绝缘子不同部位伞裙的拉伸强度和断裂伸长率基本一致

不同部位处的差异不影响对伞裙力学性能的判别。外观破损伞裙与未破损伞裙力学性能存在明显的界限——破损阈值

破损拉伸强度阈值为4.4MPa

破损断裂伸长率阈值为1.1

伞裙力学性能低于破损阈值时易发生破损。随着运行年限增加

伞裙破损比例增加。随着伞裙断裂伸长率降低

伞裙拉伸强度开始变化不大

之后呈线性下降的趋势

在下降阶段伞裙容易破损。

Abstract

Due to the high salt content

high humidity and strong sunshine radiation environment

the aging state of island composite insulators has attracted more attention. It is very important to evaluate the aging characteristics of composite insulator sheds for ascertaining the aging state of silicone rubber. In this paper

39 samples with different voltage levels

service life and manufacturers were selected. The mechanical properties of insulator sheds were measured by electronic universal testing machine

and the aging characteristics and change of insulator sheds were analyzed. The results show that the tensile strength and breaking elongation of sheds at different parts of insulator are relatively consistent

which does not affect the judgment to insulator properties. There is an obvious boundary between the mechanical properties of broken and unbroken insulators

which is called the broken threshold. The tensile strength threshold of broken insulator sheds is 4.4 MPa

and the breaking elongation threshold of broken insulator sheds is 1.1. Breakage occurs when the mechanical properties of sheds are lower than the broken threshold. With the prolongation of service life

the proportion of broken insulators will increase. In the aging process of composite insulator

with the decrease of breaking elongation

the tensile strength negligibly changes at first

then presents a linear decline trend with breaking elongation

and insulator sheds are likely to be broken in the descending stage.

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