基于单端暂态能量的双回线路故障选相方法

当双回线路发生故障时，对故障进行分相跳闸对系统运行非常有利，这就需要判断双回线路的故障相别。文章基于故障分量的观点，利用模量变换对故障产生的高频电流能量信息进行分析，由于不同故障类型产生的模分量不同，相应的模分量特征也不同，因此建立了模量能量函数与故障类型之间的关系，得到了一种新的故障选相方法。该方法只需单端电流信息，不需要双端通信。EMTP仿真结果验证了该方法的正确性。

A ONE TERMINAL TRANSIENT ENERGY BASED FAULTY PHASE SELECTION METHOD FOR PROTECTION OF DOUBLE CIRCUIT LINES

When fault occurs in double circuit transmission line, it is very important for system operation to trip out the faulty phase and it is necessary to judge the faulty phase in the double circuit. On the basis of fault component, the energy information of high frequency current caused by the fault is analyzed by the modal transform. Because the modal components caused by various kinds of faults as well as the corresponding features of modal components are different, so the relation between the modal energy functions and the fault kinds are built and a new faulty phase detection method, which needs only the current information at one terminal and does not require the communication between the two terminals, is proposed. The simulation results by EMTP verified the correctness of the proposed method.