为了研究电缆水树修复技术的长期作用效果,采用水针电极老化法获得水树老化交联聚乙烯(XLPE)电缆样本,对其中一组样本进行注入式修复,另一组不做处理,然后对两组样本同时进行电热老化实验,对比分析两组样本的微观结构和理化性能变化.显微镜观测结果表明,电热老化相同时间后,修复样本水树区域有修复生成的填充物存在.差示扫描量热(DSC)结果表明,电热老化使得XLPE熔程变窄,结晶度变小,电热老化相同时间后,修复样本的熔程和结晶度均大于未修复样本,并且修复样本的结晶速率大于未修复样本.分析认为修复液与水分子反应的生成物有效填充修复了水树空洞,并进一步限制了水分子的扩散迁移,一定程度上减缓了老化对材料的破坏.
To study the long-term rejuvenation effect of water tree rejuvenation technology, water tree aged XLPE cable samples were obtained by water-needle electrode method. One group of the samples was injected with rejuvenation liquid, while the other group remained unchanged, and then the both two group samples were subjected to electrical-thermal ageing. The micro-structure and physical and chemical properties of the two group samples were compared. The microscope observation shows that after the same time of electrical-thermal ageing, there are rejuvenation fillers in the water tree region of the rejuve-nated samples. DSC analysis shows that after the electrical-thermal ageing, the melting range of XLPE narrows and the crystallinity decreases. The melting range and crystallinity of the rejuvenated samples are larger than that of the un-rejuvenated samples, and the crystallization rate of the rejuvenated samples is greater than that of the un-rejuvenated samples. According to the observation, the rejuvenation liquid would react with water and the resultant can fill the water tree voids effectively, which inhibits the further diffusion of water molecules, retarding the ageing damage to material to some extent.
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