可水解抗氧化剂对XLPE电缆修复技术长期性能的影响  

Effect of Hydrolysable Antioxidants on Long-term Properties of XLPE Cable Rejuvenation

作　　者：张益舟 云浩 汪亮 孙宇飞 桂春 王雷 陈祎林 周凯[2] ZHANG Yizhou;YUN Hao;WANG Liang;SUN Yufei;GUI Chun;WANG Lei;CHEN Yilin;ZHOU Kai(China Nuclear Power Operation Technology Corporation Ltd.,Wuhan 430223,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]中核武汉核电运行技术股份有限公司,湖北武汉430223 [2]四川大学电气工程学院,四川成都610065

出　　处：《绝缘材料》2022年第4期77-82,共6页Insulating Materials

摘　　要：为了研究可水解抗氧化剂对XLPE电缆修复技术长期性能的影响,本研究选取两种含不同抗氧化剂的修复液配方对水树老化电缆进行注入修复,并进行二次热老化,测试并分析修复与热老化前后电缆样本的电气性能变化。结果表明:两种修复液均能显著减小水树老化电缆的介质损耗因数、泄漏电流和电导率,增大击穿电压,其中添加可水解抗氧化剂的修复样本击穿电压更大;二次热老化后,两组修复样本的介质损耗因数、泄漏电流、电导率增大,击穿电压减小,但添加可水解抗氧化剂的修复样本各项参数总体优于添加不可水解抗氧化剂的修复样本。研究证明了可水解抗氧化剂硅氧烷发生水解-缩合反应形成低聚物,分子链段增长,耐迁出能力提高,能够长期留存在电缆绝缘内部,抑制聚合物分子的热氧老化过程。In order to investigate the effect of hydrolysable antioxidants on long-term properties of XLPE cable rejuvenation,we selected two kinds of rejuvenation fluid containing different antioxidants to inject water tree ageing cable,and conducted secondary thermal ageing,then tested and analyzed the electrical performance changes of cable samples before and after rejuvenate and thermal ageing.The results show that the two rejuvenation fluid can significantly reduce the dielectric loss factor,leakage current,and conductivity of water tree ageing cable,and increase the breakdown voltage,the rejuvenate samples with hydrolysable antioxidant show a higher breakdown voltage.After secondary thermal ageing,the dielectric loss factor,leakage current,and conductivity of the two groups of rejuvenate samples increase again,while the breakdown voltage decreases.However,the parameters of the rejuvenate samples with hydrolyzable antioxidant are generally superior to those with non-hydrolyzable antioxidant.It is proved that oligomers are generated by hydrolyzation-condensation reaction of hydrolysable antioxidant siloxane,which can elongate the molecular chain segment and improve the ability of migration resistance,and can be retained in the cable insulation for a long time to inhibit the thermal oxygen ageing process of polymer molecules.

关 键 词：交联聚乙烯电缆 可水解抗氧化剂 电缆修复 水树老化 长期性 

分 类 号：TM246[一般工业技术—材料科学与工程]