中文摘要：

为了解覆冰对电力系统的安全可靠运行影响程度,开展了110kV电压互感器瓷套交流覆冰闪络特性试验研究,结果表明：随着覆冰程度的增加,110kV电压互感器瓷套交流覆冰闪络电压将降低,其覆冰闪络电压与覆冰质量和覆冰厚度分别满足负指数和负幂函数关系,且特征指数范围分别为0.085～0.100和0.40～0.55;110kV电压互感器瓷套冰闪电压与覆冰前污秽有关,其覆冰闪络电压与污秽满足负幂函数关系,且特征指数范围为0.21～0.26;当覆冰厚度达25mm且盐密为0.08mg/cm2及以上时,运行中的110kV互感器瓷套将发生覆冰闪络;防止110kV互感器瓷套交流冰闪的有效措施是采用增加结构高度和加装增爬裙,研究结果可为覆冰地区变电站外绝缘的选择和设计提供参考。

英文摘要：

The AC flashover performance of 110 kV iced potential transformer is investigated by testing in laboratory to analyze the influence degree of icing on the safe and reliable operation of power system.The results show that the AC flashover voltage of 110 kV iced potential transformer decreases with the ice amount increasing.The relation between icing flashover voltage and ice amount accords with the negative exponential function law,and the characteristic index is in the range of 0.085~0.100.Meanwhile,the relation between icing flashover voltage and ice thickness accords with the negative power function law,and the characteristic index is in the range of 0.40~0.55.The flashover voltage of 110 kV iced bushing is related to the pollution before icing.The relation between icing flashover voltage and salt deposit density（SDD） accords with the negative power function law,and the characteristic index is in the range of 0.21~0.26.When the ice thickness is up to 25 mm and SDD is 0.08 mg/cm2 and above,the icing flashover occurs on the 110 kV potential transformer in service.The effective measures to prevent AC icing flashover of 110 kV potential transformer are to increase the height of the structure and install creepage extenders.The results can offer consults for the external insulation selection and design of substation in ice covered regions.