220 kV电缆XLPE绝缘材料热氧老化性能对比  

Comparative study on thermal-oxidative aging properties of XLPE insulation for 220 kV cable

作　　者：侯帅 傅明利 黎小林 贾磊 朱闻博 章彬 徐曙 伍国兴 HOU Shuai;FU Mingli;LI Xiaolin;JIA Lei;ZHU Wenbo;ZHANG Bin;XU Shu;WU Guoxing(Electric Power Research Institute,China Southern Power Grid,Guangzhou 510663,China;Shenzhen Power Supply Bureau,Shenzhen 518000,China)

机构地区：[1]南方电网科学研究院有限责任公司,广东广州510663 [2]深圳供电局有限公司,广东深圳518000

出　　处：《电机与控制学报》2024年第4期120-130,共11页Electric Machines and Control

基　　金：南方电网公司重点科技项目(SZKJXM20190588)。

摘　　要：以进口同级材料为对比,对国产220 kV交联聚乙烯(XLPE)交流电缆绝缘料开展不同温度下的热氧老化实验,采用红外光谱、差示扫描量热法、凝胶含量、机械性能、电气性能等测试对材料热氧老化前后性能进行系统研究。结果表明,材料化学成分、结晶性能以及交联度受老化温度影响较小,而机械和电气性能变化明显。随着老化温度升高,进口料羰基指数增大更明显,2种材料凝胶含量先增大后减小,其中进口料老化前后凝胶含量均相对较低,更容易结晶。机械性能测试表明,进口料热氧老化性能相对更优,且老化前后均表现出更高的拉伸强度和断裂伸长率。2种材料热氧老化后介质损耗因数均上升,但二者差异以及由此导致的绝缘层温升不大。国产料的交流击穿场强和电树枝起始电压更高,电树枝生长更为缓慢,且无论老化与否,国产料在耐电性能上均保持明显优势。With the imported material of the same voltage level as a reference,thermal-oxidative aging tests were done at different temperatures for domestically produced 220 kV crosslinked polyethylene(XLPE)AC cable insulating material.The aging behavior of the two materials was systematically characterized by investigation of infrared spectroscopy,differential scanning calorimetry,gel content,mechanical properties and electrical properties.The results show that the chemical composition,crystallization properties and crosslinking properties of the two materials are less affected by aging temperature,while the changes of mechanical and electrical performances are more obvious.As the aging temperature increases,the carbonyl index of imported material increases more obviously,and the gel contents of the two materials increase first and then decrease.The gel content of the imported material is relatively lower re-gardless of aging,and it is easier to crystallize.The mechanical property test results indicate that the thermal-oxidative aging performance of imported material is relatively better and it shows relatively higher tensile strength and elongation at break under various aging conditions before and after aging.The dielec-tric loss factors of the two materials increase after thermal-oxidative aging,but the difference between the two materials and the consequent temperature rise of the insulating layer are not significant.The domestic material has higher breakdown strength,higher electrical tree initiation voltage and slower tree growing rate.And regardless of the degree of aging,the domestic material obviously maintains its advantages in e-lectrical strength.

关 键 词：交联聚乙烯 电缆绝缘 热氧老化 击穿强度 电树枝 机械性能 

分 类 号：TM85[电气工程—高电压与绝缘技术]