摘要
采用脉冲电声法(PEA)测量固体电介质中空间电荷的分布时,由于受介质特性和系统硬件的影响,测量波形会发生畸变。文中用高斯函数模拟低场强下界面电荷波形衰减前后峰形的变化,建立了波形衰减模型。把介质的衰减因子看作一个传导矩阵,获得了恢复整个介质中空间电荷分布曲线的方程式。通过对信号在介质和放大器中传输过程的分析和建模,以Matlab软件对实测波形进行了恢复。结果表明:在电荷分布波形中电极A处的峰值可恢复到90%,而且被掩盖的异极性电荷得以显现。
Waveform of space charge distribution in solid dielectrics measured by the PEA method is severely distorted due to the wave attenuation in material as well as the intrinsic characteristic of measurement system. The waves of interfacial charges before and after attenuation in sample under low electric stresses were simulated by Gaussian functions, and an attenuation equation was developed. The attenuation function taken as a transfer matrix, a recovery waveform function of the total space charges was obtained. A recovery model was established on transmission analysis of the signal in the dielectric and amplifier, and the test wave was recovered by Matlab processing. It is shown by the treatment results that the amount of interface space charges at the electrode A can be recovered to 90% of those at the electrode B. Moreover, the hetero-charges near the electrode A can be obviously found in the recovered waveform.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第16期137-140,共4页
Proceedings of the CSEE
基金
国家自然科学基金项目(50277030)~~
关键词
绝缘技术
空间电荷
固体电介质
波形畸变
数据处理
Insulation technology
Space charge
Solid dielectrics
Waveform distortion
Data processing
