摘要
为改善可回收电缆主绝缘材料聚丙烯的韧性,分别采用辛烯乙烯弹性体（POE）和丙烯基弹性体（PBE）对其进行改性处理。模拟电缆中间接头的电场分布形式,研究了弹性体含量对等规聚丙烯/硅橡胶（i PP/Si R）界面击穿过程的影响。结果表明,加入2种弹性体均能使i PP/Si R界面的击穿时间有较大的延长,但弹性体质量分数达到35%以后击穿时间开始缩短。（i PP＋POE）/Si R界面放电起始阶段的时间比（i PP＋PBE）/Si R长,而（i PP＋POE）/Si R界面的放电发展时间比（i PP＋PBE）/Si R短。分析认为,随着弹性体的加入,i PP弹性模量降低,使得界面气孔的尺寸减小,击穿时间延长。此外,2种弹性体与i PP相容性不同导致的微观结构和陷阱分布差异是影响界面击穿过程不同的主要因素。
Two kinds of elastomers, i.e. ethylene-octene copolymer（POE） and propylene-based elastomer（PBE）, were used to improve the flexibility of polypropylene（PP） so as to make it proper for the main insulation of recyclable power cable. By simulating the electric field distribution of a cable joint, the effect of elastomer content on the interfacial breakdown of i PP/Si R was investigated. The test results show that the addition of POE and PBE can greatly prolong the breakdown time of the i PP/Si R interface, but the breakdown time is shortened if the mass fraction of elastomer added into i PP reaches 35%. Discharge initiation time of（i PP＋POE）/Si R interface is longer than that of（i PP＋PBE）/Si R, while（i PP＋POE）/Si R discharge development time is shorter than that of（i PP＋PBE）/Si R. It is suggested that the decrease of elastic modulus results in the presence of smaller size of air cavities along the interface, which leads to the delay of breakdown time. In addition, the difference of microstructure and trap distribution caused by different compatibilities between the two elastomers and PP is the main factor affecting the interfacial breakdown process.
作者
高宇
黄世浩
陈令英
徐航
杜伯学
GAO Yu;HUANG Shihao;CHEN Lingying;XU Hang;DU Boxue(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;State Grid Shandong Electric Power Research Institute,Jinan 250002,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第9期2874-2880,共7页
High Voltage Engineering
基金
国家自然科学基金(51677127)
国家重点基础研究发展计划(973计划)(2014CB239501
2014CB239506)~~
关键词
聚丙烯
硅橡胶
交流电压
界面放电
聚烯烃弹性体
polypropylene
silicone rubber
AC voltage
interface discharge
polyolefin elastomer
