交联温度对XLPE累积电荷衰减特性的影响  

Effects of Cross-linking Temperature on Decay Behavior of XLPE Charge Accumulation

作　　者：朱晓辉[1,2] 杜伯学[1] 高宇[1] 马宗乐[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072 [2]天津市电力科学研究院,天津300040

出　　处：《高电压技术》2009年第12期3154-3158,共5页High Voltage Engineering

基　　金：国家自然科学基金(50777048)~~

摘　　要：交联聚乙烯(XLPE)中的累积电荷是造成电力电缆局部电场集中、引发电树枝和绝缘击穿事故的重要原因。为考察对保障XLPE电缆的安全运行十分重要的累积电荷的衰减机理,以不同温度交联形成的XLPE薄膜为试样,通过电晕充电法向试样注入电荷,采用静电电位计测量试样表面电位,分析了交联温度对累积电荷衰减特性的影响。结果表明,正、负电荷均呈现非线性衰减特性,正电荷衰减程度高于负电荷;随着交联温度的升高,正、负电荷的衰减速度均先减小后增大。最后得出交联剂过氧化二异丙苯(DCP)在交联过程中分解产生的副产物苯乙酮及水分,是影响电荷衰减特性的主要原因。Cross-linked polyethylene （XLPE） films were employed as test samples to investigate the charge decay behavior by means of surface potential decay. The samples were cross linked by adding dicumyl peroxide （DCP） as cross-linking agent into low density polyethylene with temperature ranged from 150 ℃ to 180 ℃. Surface potential was measured by electrostatic probe after corona was charged for 5 minutes. The results show that charge decay behaves non-linearly. With the increase of the temperature, the decay rate decreases initially then tends to increase. It is suggested that space charge behavior depends upon the concentration of cross-linking byproducts which is varied as a function of the temperature.

关 键 词：XLPE 空间电荷 表面电位 衰减 交联温度 DCP 

分 类 号：TM83[电气工程—高电压与绝缘技术]