有机硅修复后水树电缆在电热老化下的电气性能和微观结构变化

发布时间：2018-09-09 10:38

【摘要】：为了研究电缆水树修复的长期效果,对修复和未修复的水树老化电缆样本进行了电热协同老化,对比分析了2组电缆样本的电气性能和微观结构变化。利用加速水树老化实验平台,采用水针电极老化法在交联聚乙烯(XLPE)电缆样本中生成了水树缺陷,对其中1组样本进行了注入式修复,对另1组样本则不做处理,之后利用电热协同老化实验平台对2组样本同时进行了电热老化。对电热老化前后样本的显微镜观测结果表明,电热老化2周时间后,修复样本的水树整体尺寸明显小于未修复样本;介质损耗因数的测试结果表明,电热老化2周时间后,修复样本的绝缘性能远高于未修复样本;对2组样本水树老化区域的扫描电镜(SEM)观测和能谱仪(EDS)分析结果表明,修复样本在电热老化2周时间后,水树空洞内部仍有修复生成的填充物与XLPE基体紧密结合。基于以上发现,证明了在电热老化过程中,水树空洞内的修复填充物能够有效抑制已有水树的继续生长并保持长期作用。
[Abstract]:In order to study the long-term effect of cable water tree restoration, the electrothermal co-aging of repaired and unrepaired water tree aged cable samples was carried out. The electrical properties and microstructure changes of two groups of cable samples were compared and analyzed. Using the accelerated water tree aging test platform, the water tree defect was generated in the (XLPE) cable sample by the method of water needle electrode aging. One group of samples was repaired by injection, and the other group was not treated. After that, two groups of samples were subjected to electrothermal aging simultaneously using the electrothermal co-aging experimental platform. The microscopic observation results of samples before and after electrothermal aging showed that after electrothermal aging for 2 weeks, the whole size of water tree of repaired samples was obviously smaller than that of unrepaired samples, and the dielectric loss factor test showed that after 2 weeks of electrothermal aging, the whole size of water tree of repaired samples was obviously smaller than that of unrepaired samples. The insulation properties of the repaired samples were much higher than those of the unrepaired samples, and the results of scanning electron microscope (SEM) (SEM) observation and (EDS) analysis of the water tree aging area of the two groups of samples showed that the repaired samples were aged for 2 weeks after electrothermal aging. The inner cavity of the water tree is still filled with repaired fillers which are closely bound to the XLPE matrix. Based on the above findings, it is proved that in the process of electrothermal aging, the repair filler in the water tree cavity can effectively inhibit the continued growth of the existing water tree and maintain the long-term effect.
【作者单位】：四川大学电气信息学院;云南电网有限责任公司电力调度控制中心;
【基金】：国家自然科学基金(51477106)~~
【分类号】：TM247

【相似文献】