高海拔400 kV绝缘子覆冰特点及污秽闪络试验研究

Experimental Study on Ice Coating Characteristics and Pollution Flashover of High Altitude 400 kV Insulators

污秽、覆冰、高海拔的影响会降低绝缘子的外绝缘性能,绝缘子发生覆冰闪络事故,会对线路安全运行造成威胁。为了研究污秽、覆冰、高海拔综合作用下超高压绝缘子串冰闪特性,在贵州高海拔自然试验场,对4组7片绝缘子进行了自然覆冰污秽闪络试验。研究结果表明,绝缘子自然覆冰具有迎风面伞裙覆冰先于背风面伞裙的特点,并且在融冰阶段覆冰绝缘子的绝缘性能与覆冰阶段中相比有较为明显的下降。

The combination of high altitude,pollution,ice cover and snow cover will reduce the insulation performance of the insulators of transmission lines and the ice flashover accident of insulator will threaten the safe operation of the line.In order to study the ice flashover characteristics of UHV insulator string under the combined action of pollution,icing and high altitude,high altitude in Guizhou natural proving ground,in this paper,four groups of 7 insulators are tested for natural icing pollution flashover at high altitude natural test site in Guizhou.The results show that the natural ice coating of insulator has the characteristics that the ice covering of windward umbrella skirt is prior to that of leeward umbrella skirt,and the insulation performance of the insulators decreases significantly in the melting stage compared with that in the icing stage.