中文摘要：

摘要：覆冰地区现有的复合绝缘子的伞形结构较易被冰凌桥接，使其电气绝缘性能下降，在运行电压下发生冰闪导致停电，严重时将威胁电网的安全运行。基于多功能人工气候室内4种结构的110kV复合绝缘子串的覆冰特征，比较研究了它们的覆冰特性、冰闪特性和闪络过程的影响。结果表明：相同覆冰条件下，110kV防冰闪型复合绝缘子的特征指数日（表征污秽程度ESDD对冰闪电压坼影响的特征指数）小于普通型复合绝缘子串，其冰闪电压比普通型绝缘子提高的百分比随着染污盐密的增加而增大，即污秽程度越重，防冰型复合绝缘子的冰闪电压比普通型复合绝缘子提高的幅度就越大。因此，合理的复合绝缘子的结构可提高其冰闪特性，该文的研究结果可为我国覆冰地区输电线路复合绝缘子的选择和设计提供参考。

英文摘要：

The electrical insulation strength of existing composite insulators would reduce with the shed configuration which is easier to be bridged by the ice in icing regions. Icing flashover of insulator strings can lead to power outages, even worse, threatens the safe operation of power networks at normal service voltage. Based on the icing characteristics of four types of 110 kV composite insulators in the multi-function artificial climate chamber, the icing influence, icing flashover influence and flashover process were investigated and compared. The results show that the characteristic exponents a （characterizing the influence of pollution degree ESDD on the flashover voltage Uf） of the ll0kV anti-icing composite insulators are smaller than that of the normal composite insulator in the same icing conditions. Moreover, the percentage of voltage increases between the former and latter increases with the increase of the pollution degree ESDD. Namely, the pollution is more serious, the flashover voltage of anti-icing composite insulators is higher than normal. So the reasonable composite insulator＇s umbrella structure can improve the icing flashover performance. The results can offer some consult for the selection and design of composite insulator used transmission lines in the icing regions.