首页|AC ageing performance of Ag + doped high voltage gradient ZnO varistors
AC ageing performance of Ag + doped high voltage gradient ZnO varistors
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
Zinc oxide (ZnO) varistor exhibiting excellent nonlinear volt-ampere characteristics, has now been widely applied to overvoltage protection in electrical equipment. However, the greater severity of AC ageing is a realistic issue facing the high-voltage gradient varistors used in ultra-high-voltage surge arresters. To some degree, silver (Ag) doping is effective in improving the performance of varistors. In spite of this, it remains necessary to explore its influence on the ageing process of varistors. In this study, an investigation is conducted into the microstructure, macroscopic electrical properties, and barrier potential of varistors with different Ag doping concentrations, so as to determine the optimal level of doping concentration required for improving the long-term stability of varistors. Furthermore, the mechanism of Ag+improving ageing resistance is accounted for in theory. The research results indicate the best anti-ageing performance is achieved at the doping concentration of 50 ppm.
varistorsdopedAC ageingC-Vcharacteristic
Lei Wang、Jian Zhang、Zhongyuan Li、Lu Li、Wenbo Yu、Jingke Guo
展开 >
State Grid Heilongjiang Electric Power Co., Ltd. Electric Power Research Institute
NETL
NSTL
