氧气浓度对低密度聚乙烯直流老化电特性的影响  

Effects of Oxygen Concentration on the Electrical Properties of Low-density Polyethylene during DC Aging

作　　者：周远翔[1] 黄建文[1] 张灵[1] 王云杉[2] 黄猛[1] 

机构地区：[1]清华大学电力系统及发电设备安全控制和仿真国家重点实验室,北京100084 [2]电力规划设计总院,北京100120

出　　处：《绝缘材料》2012年第6期38-42,共5页Insulating Materials

基　　金：国家自然科学基金项目(50438070);电力系统仿真与控制重点实验室基金项目(SKLD10-M09)

摘　　要：为研究氧气浓度对绝缘材料直流老化过程的影响,将低密度聚乙烯(LDPE)置于纯氮气、空气、纯氧气3种不同的氧气浓度气氛下进行直流老化,并利用电声脉冲法测量LDPE老化试样的空间电荷特性。结果表明:100 h直流老化条件下更高的氧气浓度可以降低陷阱平均深度,提高空间电荷迁移率。测量老化100 h后试样的电特性,发现高氧气浓度能够增大试样的体积电阻率和正极性直流击穿电压,且随着氧气浓度的增大,击穿电压呈U形击穿特性。In order to study the effects of oxygen concentration on the direct current（DC） aging process of insulating materials, a low-density polyethylene（LDPE） was subjected to DC aging under three various oxygen concentration environment, i.e. pure nitrogen, air and pure oxygen, respectively, and the space charge characteristic of aging LDPE was measured by pulsed electro-acoustic method. The results show that higher oxygen concentration can decrease the trap depth and increase the mobility of space charge during 100 h DC aging. The electrical properties of the LDPE after 100h DC aging were measured and it was found that high oxygen concentration can increase the volume resistivity and positive DC breakdown voltage. With the increase of the oxygen concentration, the breakdown voltage shows U shape breakdown characteristic.

关 键 词：氧气浓度 低密度聚乙烯 直流老化 电气特性 

分 类 号：TM201.4[一般工业技术—材料科学与工程]