摘要
双层电介质广泛应用于高压电气设备绝缘系统中,由此引入的空间电荷积聚和局部电场畸变问题已得到普遍关注。为揭示界面空间电荷特性及其影响影响因素,文中以热老化处理(130℃)的双层聚酯薄膜(PET)为研究对象,采用电声脉冲法(PEA)测量技术对不同热老化程度双层介质的空间电荷特性进行研究,基于测试结果从3个方面对双层介质表面态特性进行表征,建立改进的双极性电荷输运模型(BCT),模拟空间电荷的动态演变过程,揭示了表面态对电荷特性的影响规律。试验结果表明:随着老化时间增加,界面电荷密度先增加后减小,界面区域以电子性陷阱为主,但该区域电子和空穴陷阱呈现非对称特性。仿真结果表明:表面态对界面电荷行为有重要影响,介质表面陷阱深度、密度及其分布范围的增加导致界面电荷的积聚更加严重。
Double layer dielectrics are widely used in the insulation system of high-voltage apparatus,and such problems as space charge accumulation and local electric field distortion caused have been widely concerned.For revealing the space charge characteristic of interface and its influence factors,the double layer thermally aged polyester film(PET)with thermal aging treatment(at 130℃)is taken as the research object.The Pulsed Electroacoustic method(PEA)measurement technology is adopted to research the space charge characteristic of double layer dielectrics with different thermal aging degree.Based on the test result,the characteristic of the double layer dielectric surface is characterized from three aspects.The dynamic evolution process of space charge is simulated by setting up improved bipolar charge transport model and the influence of surface state on charge characteristics are revealed.The test results show that with the increase in aging time,the interface charge density firstly increases and then decreases,and the interface area is dominated by electronic traps,but the electron and hole traps in this interface region show asymmetric characteristics.The simulation results show that the surface state has an important influence on the interface charge behaviors,and the increase in the trap depth,density and its distribution range on the surface of the dielectric leads to more serious accumulation of interface charges.
作者
姜雄伟
金涌涛
韩睿
彭庆军
JIANG Xiongwei;JIN Yongtao;HAN Rui;PENG Qingjun(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;Electric Power Research Institute of Yunnan Power Grid Corporation,Kunming 650106,China)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第3期61-68,共8页
High Voltage Apparatus
基金
国家电网有限公司科技项目(5200-201919048A-0-0-00)。
关键词
双层介质
空间电荷
热老化
表面态
双极性电荷输运模型
double layer dielectric
space charge
thermally aged
surface state
bipolar charge transport model
