摘要
为研究陷阱参数对纳米氧化铝(Al_2O_3)改性绝缘纸板介电特性的影响,该文利用实验室小型造纸设备制备出纳米Al_2O_3改性纸板,研究了其介电特性随纳米掺杂比例的变化规律。借助热刺激电流(thermally stimulated current,TSC)法测量了不同纳米掺杂比例下改性纸板的陷阱参数;通过建立纤维素中纳米颗粒的多核模型,分析了陷阱参数对改性纸板介电特性的影响机理。试验结果表明:改性纸板的电导率、相对介电常数及介质损耗因数随纳米掺杂比例的上升先减小后增大,而直流击穿场强则先增大后减小,并在掺杂比例为2.5%时出现最大值;同时,其电导率在高掺杂比例下随电场强度的增加表现出明显的非线性特性;借助能带理论分析得出,改性纸板体系中陷阱深度与陷阱密度随纳米掺杂比例的上升呈先增大后减小的趋势,与热刺激电流测试结果相符,且随陷阱深度和密度的增加,改性纸板击穿场强上升、电导率下降。以上结果表明,陷阱参数是影响改性纸板介电特性变化的主要原因。
In order to study the influence of nano modification on the dielectric characteristics of insulation pressboard, the A1203 modified pressboard was developed by nano-doping method with minitype laboratory devices. The changing rules of dielectric parameters of modified pressboard with nano-doping content were studied, and the multi-core model of nano particles in cellulose was built. Moreover, the trap parameters were tested by thermally stimulated current（TSC） method, and its functional mechanism on dielectric characteristic of insulation pressboard were analyzed as well. The measuring results show that the conductivity, the relative permittivity and the dielectric loss factor fall firstly and then rise with the increase of nano-doping content. While, the breakdown strength of modified pressboard firstly increases and then decreases with the increase of nano-doping content, and reaches the peak value at 2.5%. Meanwhile, the conductivity shows nonlinear characteristics with the enhancement of electric field strength at high nano-doping content. In addition, the trap characteristics in multi-core model were analyzed by using the theory of energy band. It presents that the trap destiny and depth increase firstly and then decrease as the nano-doping content rising, which is in accordance with the result of TSC test. Besides, the breakdown strength increases and conductivity decreases with the increase of trap depth and density. Above all, it can be concluded that trap parameters have great effect on the dielectric characteristics of nano modified pressboard.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第14期4246-4253,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(51407051
51677046)
黑龙江省自然科学基金资助(ZD201310)~~
关键词
油纸绝缘
纳米复合电介质
介电特性
陷阱参数
oil-paper insulation
nano-composite
dielectric characteristics
trap parameters
