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。
To understand long-lasting rejuvenation treatment of the cable rejuvenation technology, the electrical-thermal aging experiment was performed on rejuvenated and un-rejuvenated water-tree cables, and the eleetrical property and mi- cro-structure changes of the two groups of samples were compared. Based on the water-tree accelerated aging platform, a water-needle aging method was used to obtain water trees in cross-linked polyethylene （XLPE） cable samples, and one group of the samples was injected with rejuvenation liquids while another group remained unchanged. Then both two groups of samples were subjected to electrical-thermal aging. Samples before and after the electrical-thermal aging were observed by microscope, it shows that water tree sizes of rejuvenated samples are much shorter than that of un-rejuvenated samples after two weeks of electrical-thermal aging. Dielectric loss factor （tang） test shows that after two weeks of electrical-thermal aging, insulation performance of the rejuvenated samples is better than that of un-rejuvenated samples. Using the scanning electron microscope （SEM） and energy disperse spectroscopy （EDS） to observe the wa- ter-tree area, the produced rejuvenation fillers in water tree voids are observed tightly embed in the XLPE matrix after two weeks of electrical-thermal aging. According to the results, it shows that the rejuvenation fillers in water tree voids can effectively inhibit the further growth of water trees and keep long-term effect.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第5期1656-1663,共8页
High Voltage Engineering
基金
国家自然科学基金(51477106)~~
关键词
交联聚乙烯电缆
水树
修复
电热老化
填充物
抑制
长期作用
XLPE cable
water trees
rejuvenation
electrical-thermal aging
filler
inhibition
long-term effect
