摘要
设计了用于气固界面闪络的实验装置,可以安装指形电极(曲率半径为10 mm)和平板电极.该设备可输出峰值为125 kV、上升沿和半高宽为20 ns/5μs的快脉冲.研究了无试样时指形电极系统在不同气压下的击穿特性,在空气和SF6气体中不同气压下纯环氧的脉冲闪络特性,以及不同质量分数的Al2O3.3H2O环氧复合材料在0.4 MPa空气中的沿面闪络特性.结果表明,SF6气体中绝缘介质的闪络电压较空气中有更大的分散度,环氧复合材料质量分数为20%时闪络电压最低.
An experimental device is designed for surface flashover test along gas-solid interface, where the finger electrodes or flat electrodes are alternatively installed, and the stainless steel finger type electrodes with 10 mm curvature radius are selected. The peak output voltage of pulse power reaches to 135 kV with 20 ns rise time and 5 μs full width at half maximum. The experimental properties of pure epoxy and epoxy composite samples are discussed under nanosecond pulse in air and SF6. The breakdown properties of air and SF6 under different pressure are investigated by using finger electrodes. Moreover, the surface flashover properties of pure epoxy samples under different air and SF6 gas pressure and the flashover properties of epoxy/Al2O3 · 3H2O composites filled with different filler concentration in 0.4 MPa are also analyzed. The experimental results show that the dispersion of surface flashover voltage of epoxy in SF6 gets higher than that in air, and the surface flashover voltage of the composite approaches the lowest while the filler concentration reaches to 20 %.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第6期703-707,共5页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金重点资助项目(50437030)
