基于环流量的同杆四回输电线路故障选线

Fault line selection for four-parallel lines on same tower based on circulation currents

为了消除同杆四回线导线间的耦合问题,基于先线间解耦、再相间解耦的顺序,利用矩阵变换的方法提出了一种新的同杆四回线相模变换分析方法。在此基础上结合各单回线故障时的边界条件,对不同回线各种故障情况下各序环流量之间的相位关系进行全面分析。利用不同回线故障时各环流量间的相角差至少相差90°的特点,提出了一种不受系统阻抗影响的基于环流量相角差的同杆四回线故障选线方法。大量的ATP/EMTP仿真验证了该方法的准确性和有效性。

In order to eliminate the coupling effects between four-parallel transmission lines,t his paper proposes a new phase-mode transformation method for four-parallel transmission lines on same tower based on matrix transformation analysis by decoupling mutual inductances between different lines first and then decoupling mutual inductances between different phases. Based on boundary conditions of single-circuit line fault,t he phase relationship between sequence circulation componentsare deduced for different circuit lines faults. And the characteristicsthat phase-angle difference between the circulation current components is 90°at least are used to propose a new method for fault line selection of four-parallel transmission lines on same tower. The proposed method is not affected by system impedances. A large number of simulations based on ATP/EMTP prove the proposed method＇s correctness ant effectiveness.