硅橡胶电晕老化特性的微观机理研究  

Study on Micro Mechanism of Corona Ageing Characteristics of Silicone Rubber

作　　者：熊媛媛[1] 李志伟 龚瑞 XIONG Yuanyuan;LI Zhiwei;GONG Rui(Sichuan Vocational College of Chemical Technology,Luzhou 646300,China.;Chongqing Academy of Animal Sciences,Chongqing 402460,China;Meishan Power Supply Company of State Grid Sichuan Electric Power Company,Chengdu 610072,China)

机构地区：[1]四川化工职业技术学院,四川泸州646300 [2]重庆市畜牧科学院,重庆402460 [3]国网四川省电力公司眉山供电公司,四川成都610072

出　　处：《绝缘材料》2022年第6期64-70,共7页Insulating Materials

摘　　要：对硅橡胶进行电晕加速老化,测量不同老化时间下硅橡胶的绝缘特征参量,并通过特征参量分析深入研究了硅橡胶的老化机理。结果表明:电晕老化使得硅橡胶表面结构遭受严重的破坏,且在其表面形成了明显的孔洞和裂纹,并造成严重的粉化现象。电晕老化导致硅橡胶的分子长链断裂成小分子链,使得硅橡胶分子链柔顺度降低,形成各种缺陷并造成硅橡胶绝缘性能下降。电子和空穴陷阱能级中心随着电晕老化时间的增加呈现先缓慢下降后快速下降的变化趋势。且电晕老化导致深陷阱逐渐发展成浅陷阱,对电子的束缚作用减弱,最终造成硅橡胶沿面闪络的发生。The corona accelerated ageing was conducted on silicone rubber,the insulation characteristic parameters of silicone rubber under different ageing time were measured,and the ageing mechanism of silicone rubber was deeply discussed according to the parameters.The results show that corona ageing causes serious damage to the surface structure of silicone rubber,and obvious holes and cracks are formed on its surface,resulting in serious pulverization.Corona ageing makes the long molecular chain of silicone rubber break into small molecular chain,reduces the flexibility of silicone rubber molecular chain,forms various defects,which leads to the decrease of the insulation performance of silicone rubber.With the increase of corona ageing time,the energy level centers of electron and hole traps decrease slowly at first and then decrease fast.Corona ageing leads to the gradual development of deep traps into shallow traps,reduces the binding effect on electrons,and finally leads to the occurrence of surface flashover of silicone rubber.

关 键 词：硅橡胶 电晕老化 绝缘性能 陷阱能级 闪络电压 

分 类 号：TM215[一般工业技术—材料科学与工程] TM216[电气工程—电工理论与新技术]