高电压技术2012，Vol.38Issue(12)：3166-3170,5.
Influence of the Suspension Modes on Pollution Flashover Performance for ±800 kV Composite Insulators Under High Altitudes Condition
Influence of the Suspension Modes on Pollution Flashover Performance for ±800 kV Composite Insulators Under High Altitudes Condition
摘要
Abstract
To solve the contamination flashover problem for transmission lines in high-altitudes area, an analysis of the {lashover performance of contaminated ± 800 kV ultra high voltage (UHV) DC composite insulators of various suspension modes at a high altitude (2 100 m) is presented. The 50% withstand voltage (U60%) was determined by the up-and-down method. Experimental results show that suspension modes play an important role in the flashover performance since DC arcs detach from the insulator surfaces more easily at high altitudes than at sea level. Flashover voltages of the long string composite insulators gradually decreased with salt deposit density (SDD). The flashover voltage of type II string is by 4.6% lower than that of type I string. For type V string, the ionized air could more easily diffuse away from the insulator surface, while producing a higher utilization ratio of the leakage distance. Therefore the flashover voltage of type V string is by 8.7 %-14.4% higher than that of type I string. Type Y string configuration appears to lead to much lower flashover voltages than type I and V string configurations.关键词
复合绝缘子/高海拔地区/悬挂方式/污闪特性/闪络电压/污染问题/字符串/堆积密度Key words
composite insulators/flashover/suspension mode/arc/flashover voltage/string configuration分类
信息技术与安全科学引用本文复制引用
ZHANG Fuzeng,SONG Lei,LI Ruihai,WANG Guoli,ZENG Xiangjun,LI Hao..Influence of the Suspension Modes on Pollution Flashover Performance for ±800 kV Composite Insulators Under High Altitudes Condition[J].高电压技术,2012,38(12):3166-3170,5.基金项目
Project supported by National Eleventh five Year Science and Technology Supporting Program of China（2006BAA02A00）. （）
