基于稳态量的同杆并架双回线综合选相

本文利用六序故障分量法分析了零序负序电流选相元件和相电流差突变量选相元件在同杆双回线跨线故障下的动作行为。分析表明,零序负序电流选相元件和相电流差突变量选相元件在某些跨线故障下会误选相。根据同杆双回线跨线故障时故障相电流相位特征,结合相阻抗方向元件,提出了一种基于单回线单端电气量的稳态量综合选相元件,保护利用分相式通道在判断两侧选相结果后实现选相跳闸。通过大量的数字仿真,验证了该方法的正确性。

A synthesis fault phase selector for double circuit lines on the same tower based on steady values

Used the six-sequence fault component,the action of some phase selectors,including the phase current difference suddenly-change and the sequence current were analyzed in this paper.Based on the future of degrees between fault phase for cross-country fault and the directional component,a synthesis fault selector using steady values in single circuit at single side for double circuit lines on the same tower is proposed.With the multi-phase channels and fault phase selection results at both sides,the relay may cut off the fault phases.At last,the simulation results prove the method is correct and valid.