摘要
提出了水树老化电缆的在线修复方法,讨论了在交变电场下修复液对水树的抑制作用及其绝缘修复机理。采用高频高压水针电极法对新样本、预修复样本和在线修复样本进行加速水树老化。老化一个月后,使用显微镜观察样本中水树形态并测量其水树长度。通过差示扫描量热法分析样本绝缘层的劣化程度,同时利用扫描电镜和能谱分析仪对比水树区域的微观形貌及化学结构变化。研究表明,在线注入有机硅修复液能有效地抑制水树的生长。在电场的作用下,修复液分子和水分子同时向强电场区域(如微孔、水树区域等)进行扩散并发生反应,消耗水分并且生成凝胶颗粒填充微孔,一定程度上缓解了绝缘的劣化。
A novel method of on-line rejuvenation for water trees in service cross-linked polyethylene（ XLPE） cables is presented,the inhibition effect and the rejuvenation mechanism are also discussed. A 30-day accelerated water tree aging experiment was done on the new samples,the prior rejuvenation samples and the online rejuvenation samples. After that, a microscope was used to observe the morphology of water trees and measure the length of the water trees. By differentially scanning calorimetry（ DSC）,the insulation degradation degree of the three group samples was analyzed. Meanwhile, the changes of micromorphology and chemical structure in water-tree areas were observed by scanning electron microscope（ SEM） and energy disperse spectroscopy（ EDS）. The results show that the on-line rejuvenation method can effectively inhibit the propagation of water trees. Under the effect of electric field,the siloxane and water molecules are driven to the high electric field areas（ such as void, water tree area, etc.） for reaction, which eliminates the deterioration in the insulation and generates gel particles to fill the areas,relieving the insulation degradation to some degree.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第21期176-182,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(51477106)
关键词
交联聚乙烯电缆
水树
硅氧烷
电场
取向
介电泳力
XLPE cable
water tree
siloxane
electric field
chain orientation
dielectrophoretic force
