中文摘要：

为进一步了解覆冰绝缘予表面空气间隙的存在对输电线路的危害，在应用模／数转换器、紫外线成像仪、工控机和自行设计的电流传感器的基础上，研究了在不同施加电压、空气间隙长度、覆冰水电导率和冰类型的情况下电晕平均放电量的变化，并揭示了它们对电晕放电特性的影响。结果表明：直流正极性下的放电量分布满足正态分布，其值随着问隙长度的增加而减小；放电量与电极表面材料有着密切关系；覆冰水电导率对放电量的影响与冰的类型（干冰、湿冰）有很大关系。

英文摘要：

To further make it clear, i.e., the damage of air gap existing in the surface of ice-coated insulator to transmission lines, on the basis of adopting A/D converter, ultraviolet imaging instrument, industrial control computer and self-designed current transducer, the variations of average corona discharge quantity under different factors such as applied voltages, air-gap lengths, freezing water conductivities and types of icicles are researched, and the influences of these factors on corona discharge characteristic are revealed. Research results show that the distribution of discharge quantity under DC positive polarity belongs to normal distribution and the value of discharge quantity decreases with the increase of air-gap length; the discharge quantity has a close relation to material for electrode surface; and the influence of freezing water conductivity on discharge quantity has great relation to the types of icicles （dry icicle or wet icicle）.