【摘要】 针对同杆并架双回线发生跨线故障时正确选相难的问题,在对跨线故障单侧同名相故障分量进行相关度分析的基础上,提出了一种新的基于单侧双回线相电流的选相元件。该选相元件通过比较单侧同名相相电流突变量的相关度及突变量幅值大小实现选相。该方法半个周期就能快速正确选相,算法简单,具有较好的鲁棒性,且易于与现有距离保护相配合。仿真结果表明,该选相元件较好地解决了同杆并架双回线的故障选相问题。更多还原

【Abstract】 In order to select the fault phase in same-tower double-circuit lines,a new fault phase selector is proposed with the analysis on the fault currents in the same phase of double-circuit line.Combining correlation analysis on the same phase currents with the amplitude of fault component,phase selection can be implemented.The algorithm is simple and fast.It can accomplish phase selection rapidly within half cycle.It also has good robustness so that it can be combined with existing distance protection easily.Computer simulation results show that the fault phase selector can solve the phase selection problem of the same-tower double-circuit lines effectively.更多还原