科研之友
微信
新浪微博
Facebook
分享链接
摘要
To solve the problem of non-uniform electric field distribution in converter transformer oil-paper insulation structure under DC voltage, the SiC modified pressboard was developed by nano doping method. The influence of different nano doping ratio on dielectric parameters of modified pressboard was studied, and the change rules between the modified pressboard dielectric parameters and applied DC electric field was researched. The homogenizing effect of the modified pressboard on electric field distribution in oil-paper insulation structure was verified by simulation method. The experimental results show that the conductivity of insulation pressboard can be changed by doping nano SiC, but it has little influence on the relative permittivity, and the conductivity of modified pressboard increases exponentially with the increasing nano SiC doping ratio. The conductivity does not increase obviously with enhancement of electric field strength at low nano doping ratio, however, it increases exponentially with enhancement of electric field strength at higher nano doping ratio, which shows good nonlinear characteristics. The simulation result shows that the electric field distribution in oil-paper insulation is well homogenized by using the nonlinear characteristics of nano-modified pressboard.
- 出版日期2014
