摘要
目前对操作冲击电压作用下的覆冰绝缘子电气特性的研究较少。文章在人工气候室内进行了模拟覆冰试验,研究了普通悬式覆冰瓷绝缘子的操作冲击特性。结果表明:覆冰将导致绝缘子的操作冲击特性下降,且随着覆冰量、覆冰水电导率的增加,50%放电电压下降且50%放电电压降低的百分比有明显的饱和趋势,击穿时间几乎发生在波尾和波峰附近。根据试验结果,文章还得到了50%放电电压与覆冰量、覆冰水电导率分别满足负指数幂函数关系的结论。
At present the electrical characteristic of ice-covered insulators under switching impulse is less researched. The authors conduct simulation ice-coating tests in multi-functional artificial climate chamber, and research the switching impulse performance of ice covered common suspension insulator string consisting of 7 pieces of XP-160 insulator. Research results show that ice-coating will make the switching impulse performance of insulator descended; with the increase of amount of ice-coating and freezing-water conductivity, the 50% discharge voltage will decrease and the decrease percentage of 50% discharge voltage presents saturation trend evidently; the breakdown time almost occurs near the time of wave tail and that of wave crest. According to test results, the conclusion that the relation between 50% discharge voltage and amount of ice-coating as well as that between 50% discharge voltage and freezing-water conductivity can be described by negative exponent function respectively is obtained.
出处
《电网技术》
EI
CSCD
北大核心
2008年第11期95-98,共4页
Power System Technology
关键词
覆冰
绝缘子
操作冲击
覆冰量
覆冰水电导率
ice-coating
insulator
switching impulse： amount of ice-coating
freezing-water conductivity
