摘要
当利用故障分量实现输电线路电流差动保护时 ,故障 (特别是外部故障 )暂态情况下线路两侧故障分量电流的相对关系是一个重要的参考依据 .为此 ,采用运算法对超高压输电线路发生外部故障的暂态过程进行定性计算分析 .计算过程中应用叠加原理求出线路两侧的故障分量电流 ,然后进行比较 ,最后得出有用结论 .
When fault components are used to carry out line current differential protection , the relationship between the fault component currents flowing through two terminals of the line is an valuable reference. Therefore, this paper utilizes Laplas Transform to make qualitative calculation and analysis for the transient process of EHV transmission line during external faults. In the calculation, the superposition theory is used to calculate the fault component currents. The useful conclusion is drew according to the calculation and analysis results.
关键词
暂态特性
短路电流计算
叠加原理
输电线路
Transient charateristics
Short circuit current calculation
Superposition theory/Current differential protection
