Effect of Corona-discharge-accelerated Deterioration of Silicone Grease on the Surface Properties of Silicone Rubber Insulation

WANG Xia; WANG Huanan; CHEN Feipeng; WU Kai; CUI Jiangjing; QIU Wei

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Effect of Corona-discharge-accelerated Deterioration of Silicone Grease on the Surface Properties of Silicone Rubber Insulation

更新时间：2025-12-08

- Effect of Corona-discharge-accelerated Deterioration of Silicone Grease on the Surface Properties of Silicone Rubber Insulation
- Vol. 46, Issue 11, Pages: 3977-3985(2020)
- 作者机构：
  
  1. 西安交通大学电力设备电气绝缘国家重点实验室
  2. 广东电网有限责任公司广州供电局
  3. 广东电网有限责任公司珠海供电局
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 November 2020，
  
  Published：2020
- 稿件说明：
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WANG Xia, WANG Huanan, CHEN Feipeng, et al. Effect of Corona-discharge-accelerated Deterioration of Silicone Grease on the Surface Properties of Silicone Rubber Insulation[J]. 2020, 46(11): 3977-3985.
DOI：

WANG Xia, WANG Huanan, CHEN Feipeng, et al. Effect of Corona-discharge-accelerated Deterioration of Silicone Grease on the Surface Properties of Silicone Rubber Insulation[J]. 2020, 46(11): 3977-3985. DOI：

摘要

硅脂广泛用于电缆附件安装过程的表面润滑和密封。但电缆附件绝缘在长期运行过程中受到硅脂的溶胀作用

且电缆与附件绝缘界面易发生沿面电晕放电乃至击穿故障。而不同硅脂在电晕老化作用下对界面电气性能和硅橡胶机械性能的影响未见报道。为此选择了6种不同涂覆硅脂

研究涂覆不同硅脂的硅橡胶在电晕老化后表面粗糙度、分子基团与交联结构、复合界面击穿电压和硅橡胶本体机械性能的变化。结果发现:电晕老化破坏了硅脂和硅橡胶的表面形态和硅橡胶的交联结构

导致界面绝缘强度和硅橡胶机械性能下降严重;硅脂和硅橡胶表面出现的裂纹孔洞以及极性分子等使涂覆硅脂的试样表面粗糙度增加;而XLPE/SR复合试样界面击穿电压与硅橡胶试样表面粗糙度值呈负相关:表面粗糙度越大的试样其复合界面击穿电压越低。另外

本文提供了一种简单的硅脂性能测试思路:通过对涂覆不同硅脂的硅橡胶试样在电晕老化后的界面电气性能和机械性能等测试

可以筛选出性能稳定的硅脂。

Abstract

Silicone grease is widely used for surface lubrication and sealing in cable accessories installation. However

the insulation of cable accessories is affected by the swelling of silicone grease for a long time

where the surface discharge even interface breakdown easily occurs. So far the literature on the influence of different silicone greases with corona aging on interfacial electrical property and mechanical properties of silicone rubber is not available. Therefore

six kinds of silicone greases were selected for studying the changes of surface roughness

molecular groups and cross-linking structure

interfacial breakdown voltage and mechanical properties of silicone rubber coated with different silicone greases under corona aging. The results show that corona aging can destroy the surface morphology of silicone grease

silicone rubber

and its crosslinked structure

resulting in serious decrease in interfacial dielectric strength and mechanical properties of silicone rubber. Additionally

the cracks

holes and polar molecules on the surface of silicone grease and silicone rubber will increase the surface roughness of the coated sample

with which the interfacial breakdown voltage of XLPE/SR composite sample is negatively correlated

namely

the sample coated with a higher surface roughness has a lower interfacial breakdown voltage. Furthermore

a simple performance test of silicone grease can be provided as follows: some better silicon grease can be selected by performing the experiments for electrical and mechanical properties of silicone rubber coated with different silicone grease under corona aging.

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Related Institution

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