催化剂对硅氧烷修复水树老化电缆长期效果的影响  

Influence of Catalyst on Long-term Performance of Siloxane RejuvenatingWater Tree Aged Cable

作　　者：王利 李剑波 罗定南 WANG Li;LI Jianbo;LUO Dingnan(China Nuclear Power Technology Research Institute,Shenzhen 518124,China)

机构地区：[1]中广核研究院有限公司,广东深圳518124

出　　处：《绝缘材料》2021年第9期73-78,共6页Insulating Materials

基　　金：中国广核集团尖峰计划(R-2019ZBSEC005)。

摘　　要：为了研究不同催化剂与硅氧烷配合时,修复液对水树老化电缆修复效果的差异,选取甲基苯基二甲氧基硅烷(PMDMS)和一种长链硅烷,以及钛酸四异丙酯(TIPT)和长链苯磺酸两种催化剂,配制了4种不同配方的修复液,对水树老化电缆进行注入修复和二次老化,并通过工频击穿试验、水树形貌观测和傅里叶红外光谱测试分析短电缆试样绝缘的电气性能和微观结构变化。结果表明:4种配方的修复液均能抑制水树的生长,提高水树老化试样的击穿电压;长链硅烷搭配长链苯磺酸的修复液在绝缘层中的留存率最高,修复效果最佳;PMDMS搭配长链苯磺酸的修复液在绝缘层中的留存率最低,修复效果最差;最终证明当硅氧烷与催化剂在绝缘层中扩散速度相匹配时能够提高硅氧烷的留存率,增强修复液的长期修复效果。In order to study the rejuvenating effect difference of rejuvenation fluid on water tree ageing cable when different catalysts were combined with siloxane,we selected a methyl phenyl dimethoxy siloxane(PMDMS)and a long-chain siloxane,tetraisopropyl titanate(TIPT)and long-chain benzene sulfonic acid two catalysts to prepare four rejuvenation fluids with different formula.Water tree aged cables were rejuvenated by injecting the rejuvenation fluid and conducted second ageing,and their electrical properties and microstructure changes were analyzed by the power frequency breakdown test,water tree morphology observation,and FTIR test.The results show that four kinds of rejuvenation fluids can inhibit the growth of water tree,and the breakdown voltage of the water tree aged sample is improved.The rejuvenation fluid composed of long-chain siloxane and long-chain benzene sulfonic acid has the highest retention rate in the insulation layer,and the rejuvenating effect is the best.The rejuvenation fluid composed of PMDMS and long-chain benzene sulfonic acid has the lowest retention rate in the insulation layer,and the rejuvenating effect is the worst.It is proved that when the diffusion speed of siloxane and catalyst in insulation layer matches,the retention rate of the siloxane can be improved,and the long-term rejuvenating effect can be enhanced.

关 键 词：交联聚乙烯电缆 水树老化 硅氧烷修复液 催化剂 长期性 

分 类 号：TM247[一般工业技术—材料科学与工程]