摘要
为研究不同老化条件对电缆附件界面击穿特性的影响,首先在交联聚乙烯(XLPE)/硅橡胶(SIR)平板复合试样界面处制备环形电极,然后对涂覆两种硅脂的硅橡胶分别进行热老化、臭氧老化、电晕协同臭氧老化处理,最后在交流电压下进行XLPE/SIR界面击穿试验。同时,对涂覆硅脂并经不同老化条件处理后的硅橡胶表面微观形貌、傅里叶红外光谱及凝胶含量进行分析,探究不同老化条件对涂覆不同硅脂后XLPE/SIR界面击穿特性的影响规律。结果表明:短时热老化作用对涂覆硅脂后XLPE/SIR界面的交流击穿特性影响较小,臭氧老化及臭氧协同电晕老化均可降低XLPE/SIR界面的起始放电电压和交流击穿强度。老化作用对XLPE/SIR界面交流击穿特性的影响主要是由硅脂及硅橡胶的物化特性改变引起的。
In order to study the influence of different ageing conditions on the breakdown characteristics of cable accessories interface, firstly a ring electrode was prepared at the interface of cross-linked polyethylene(XLPE)/silicone rubber(SIR) flat composite sample, and then the silicone rubbers coated with two kinds of silicone grease were conducted thermal ageing, ozone ageing, corona and ozone co-ageing,respectively. At last, XLPE/SIR interface breakdown tests were performed under AC voltage. The surface microstructure, Fourier infrared spectrum, and gel content of the silicone rubbers coated with silicone grease and treated with different ageing conditions were analyzed, and the influence of different ageing conditions on the breakdown characteristics of XLPE/SIR interface coated with different silicone grease was studied. The results show that the short-term heat ageing has little effect on the AC breakdown characteristics of XLPE/SIR interface coated with silicone grease. Both the ozone ageing and corona and ozone co-ageing can decrease the initial discharge voltage and AC breakdown strength of XLPE/SIR interface. The effect of ageing on the AC breakdown characteristics of XLPE/SIR interface is mainly caused by changing the physicochemical properties of silicone grease and silicone rubber.
作者
李莹
余栋
崔江静
孙廷玺
仇炜
LI Ying;YU Dong;CUI Jiangjing;SUN Tingxi;QIU Wei(Zhuhai Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Zhuhai 519000,China;State Grid Fujian Fuzhou Electric Power Supply Company,Fuzhou Fujian 350009,China)
出处
《绝缘材料》
CAS
北大核心
2020年第3期41-49,共9页
Insulating Materials
基金
广东电网有限责任公司珠海供电局科技项目(GDKJXM20161743)。
关键词
电缆附件
硅橡胶
硅脂
老化
界面击穿
cable accessory
silicone rubber
silicone grease
ageing
interface breakdown
