交流特高压输电线路空气间隙的选择  

Selection of clearances for UHVAC overhead transmission line in China

作　　者：杜澍春[1] 

机构地区：[1]中国电力科学研究院,北京100085

出　　处：《中国电力》2006年第10期52-54,共3页Electric Power

摘　　要：为适应我国交流特高压输电工程建设的需要,研究影响线路安全运行和造价的空气间隙取值,具有重要意义。采用基于我国超高压电网运行经验证实科学合理的绝缘配合原则与方法,研究论证了我国ACUHV输电线路空气间隙的建议值。对于操作过电压间隙,在我国首次采用与特高压电网实际长波头操作冲击电压相适应的放电电压的特性数据通过绝缘配合的统计法来选取。利用该方法,经过计算获得线路每操作1次线路上多个间隙中至少有1个闪络的次数(风险率),并考查其是否满足预期值来选择间隙距离。经研究对塔头尺寸起决定作用的塔窗中V型绝缘子串操作过电压要求的空气间隙,在海拔高度500、1000和1500m时分别选择为6.7、7.0和7.3m。所得结果与国外类似工程作了比较,表明是科学可行的。For the needs of UHVAC project design and construction in China, it is significant to study the selection of transmission line clearance, which affects the safety operation and cost of the transmission line. Using insulation coordination guide and methods, which was used and verified by operation experience of EHV grid in China, the advised values of overhead transmission line clearances in China＇s UHV AC project were given. The clearances depending on switching impulse voltage were selected by using the curves of flashover voltages obtained at the switching impulses effect with long wavefront time, which is more suitable for UHV. Using this method and through calculation, the selected clearances were checked by the risk rate, that is the times of flashover in multi-clearance on the line at least one clearance with flashover when switching once. The study shows that the clearance of switching overvohage for ‘V＇ type suspension insulator string is selected as 6.7 m, 7.0 m and 7.3 m with 500 m, 1 000 m and 1 500 m height above sea level. The clearance is the most important for tower configuration. The results were compared with similar UHV projects in other countries, and it is feasible.

关 键 词：交流特高压输电线路 空气间隙 长波头操作冲击电压 

分 类 号：TM852[电气工程—高电压与绝缘技术] TM726.1