一种混合输电线路故障测距新方法

A New Method of Fault Location for Hybrid Transmission Line

针对近年来只增不减的电缆数引起的混合线路故障测距的问题,提出了一种基于线路百分比计算的混合输电线路故障测距方法。该方法采用更为精确可靠且有利于计算的分布参数模型,通过分别计算每个区段的线路百分比确定故障位置,求解故障距离时采用不需要双端数据同步的序分量法,双端量法可有效地克服单端量法易受系统运行方式和两侧参数的影响。仿真与计算结果表明该方法可靠有效,测距精度高,在现今电缆线日渐增多的电网中具有良好的工程应用价值。

In recent years, the number of the hybrid transmission line fault location problems raises due to the increasing numbers of cable lines. This paper proposes a new hybrid transmission line fault location method based on the percentage of line calculation. A more reliable and accurate calculation method based on distributed parameter model is proposed. The fault location is determined by calculating the percentage of each line segment, in which sequence component method is used to solve the fault distance without double-ended synchronization data. The two-terminal-data method can effectively overcome the disadvantage of single-terminal-data method which is easily affected by power system operation states and parameters.Simulation results show that the proposed method for fault location is reliable, effective, and accurate. The proposed method is promising in engineering applications with the growing number of cables.