摘要
对交联聚乙烯电缆的硅氧烷注入式修复的修复效果和作用机理进行了研究。通过水针法在交联聚乙烯(XLPE)电缆样本中形成水树缺陷后,对其进行硅氧烷修复液的注入式修复。修复后的电缆绝缘性能显著提高,介质损耗角正切值(tanδ)与工频击穿电压都远优于修复前。光学显微镜的观察证明,修复后样本中的水树缺陷得到了填充修复。通过对修复前后样本的红外光谱(IR)分析,证明了通过加压注入,硅氧烷修复液能在电缆的XLPE层中扩散和渗透,并与相关的氧化基团特别是亲水的羟基发生反应,消除亲水基团并消耗了绝缘层中的水分,使XLPE电缆的整体绝缘性能和运行寿命得到大幅提高。因此,硅氧烷注入式修复技术能修复XLPE电缆中的水树缺陷并提高其绝缘性能。
In this paper, the siloxane injecting rejuvenation of water tree aged XLPE cables is discussed. With water-needle method and accelerated aging experiment, water tree is formed inside XLPE layer. One group of the samples is injected with siloxane for rejuvenation. The insulation performance and the breakdown voltage are significantly greater than aged samples. The water tree is observed by optical microscope in aged samples, meanwhile, water tree filled by organic compounds is observed in rejuvenated samples. Infrared spectrum （IR） analyses proved that the siloxane is injected to the XLPE layer, and uniform distributed. Furthermore, IR analyses showed that moisture and hydrophilic groups in XLPE were reacted with siloxane. As a result, the insulation performance of XLPE cables was enhanced by the siloxane injection technology.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第9期268-273,共6页
Transactions of China Electrotechnical Society
