摘要
电缆附件安装时需在附件绝缘与电缆本体绝缘界面处涂覆硅脂以保证界面密封性和耐电强度,但长期运行过程中附件绝缘硅橡胶会吸收硅脂,进而降低自身的电气性能与力学性能,最终引起附件绝缘故障。为此文中重点研究硅脂在硅橡胶内分子动力学扩散过程的数学物理模型,为硅橡胶吸收硅脂的研究奠定理论基础;并研究硅脂基油—硅油的黏度、硅橡胶无机填料含量和温度对硅橡胶饱和吸收硅油/硅脂量的影响。研究表明:硅油/硅脂在硅橡胶中的扩散过程符合Langmuir扩散模型;硅橡胶吸收硅油/硅脂的单位体积饱和质量变化量随着硅油黏度以及硅橡胶中氢氧化铝、气相白炭黑含量的增大而减小,随着温度的升高而增大。
During installing the cable accessories,it is necessary to coat the insulation interface between the accessory insulation and the cable body insulation with silicone grease to ensure the sealing and electrical strength of the interface.However,in the long-term operation,the insulation silicone rubber of the accessory absorbs interfacial silicone grease,thereby reducing its own electrical and mechanical properties,and eventually causing the insulation failure of the accessories.This paper focuses on building a mathematical physical model of the molecular dynamic diffusion process of silicone grease in silicone rubber,which lays a theoretical foundation for the research of silicone rubber absorbing silicone grease.Moreover,the effects of silicone oilviscosity,silicone rubber inorganic filler content and temperature on saturated absorptivityfor silicone oil/silicone grease are studied.The results show that the diffusion process of silicone oil/silicone grease in silicone rubber follows the Langmuir diffusion model.The variation of saturated weight per unit volume of silicone rubber owing to the absorption forsilicone oil/silicone grease decreases with the increases of silicone oil viscosity and contents of aluminum hydroxide and silica in silicone rubber,but increases with the rise of temperature.
作者
赵莉华
李彦姝
黄小龙
任俊文
王仲
ZHAO Lihua;LI Yanshu;HUANG Xiaolong;REN Junwen;WANG Zhong(School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第8期2849-2855,共7页
High Voltage Engineering
基金
中央高校基本科研业务费专项资金(四川大学YJ201655).
关键词
电缆附件
复合界面
硅橡胶
硅油
硅脂
吸收特性
LANGMUIR模型
cable accessory
composite interface
silicone rubber
silicone oil
silicone grease
absorption characteristic
Langmuir model
