同杆并架双回线故障选相研究

综合运用模态变换和六序分量法分析同杆双回线的故障特征。模态量在发生单回线故障和同名相跨线故障时特征明显,适用于此种故障的选相;而六序分量法在分析非同名相跨线故障时具有明显的优势。结合这2种方法提出一种相对简单实用的同杆双回线系统各种故障判别的新方案。理论分析和仿真测试表明,该方法能够在各种运行条件和故障情况下正确选相。

Fault phase selection study for double-circuit transmission lines on the same tower

Modal component transformation and six-sequence components are used to analyze fault characteristics in double-circuit transmission lines on the same tower.Because of the obvious characteristics of module components when a single-circuit line fault or same phase faults crossing lines happen,modal component transformation method is suitable for fault phase selection in these cases.Meanwhile,six-sequence component method is better to be used when different phase faults crossing lines happen.A simple and practical phase selection scheme with the combination of these two methods for double-circuit transmission lines on the same tower is proposed.Theoretical analysis and simulation results show that the new scheme can select the fault phase correctly under various operating and fault conditions.