同杆双回线的反序负序纵联距离保护新方法

Novel Criterion of Longitudinal Distance Protection Based on Inverse Directional Negative Sequence Component for Double-circuit Transmission Line

为克服传统距离保护中存在的超越或拒动问题,利用六序分量法,分析同杆双回线中反序负序分量特征;通过对分量的图示分析,提出了一种基于反序负序分量的距离保护判据,进而结合纵联电气量和纵联逻辑信号两种保护原理,得出同杆双回线纵联距离保护新方法。该纵联保护同时适用于同杆线路背端电源弱馈的特殊运行方式。通过电磁暂态程序EMTP(electro-magnetic transient program)仿真表明,此保护综合性能良好,具有明显的方向性。

To tackle the problem of surpassing and refusing in traditional criterion, the paper analyzes the character of inverse directional negative sequence network by six sequence components, and proposes a distance protection criterion based on inverse directional negative sequence component in graphic analyses, and then puts forward a novel longitudinal distance protection principle for double-circuit transmission line. The protection involves electrical quantities longitudinal principle and logical amount longitudinal principle. For the principle, it is suitable for special operation mode of double-circuit transmission line with weak-infeed. The EMTP simulation results indicate that the proposed principle can judge the fault section sensitively.