中文摘要：

提出了基于正、负、零序量的同杆双回线断线故障分析方法。考虑同杆双回线可能出现两回线路参数不相等的情况,研究了各种断线故障情况下的线路电压、电流的序量关系并进行解耦,结合断线边界条件,给出了新的断线故障后电气量的求解方法。为简化计算,并明确各种断线故障类型下序网之间关系及序量特性,提出了复合序网分析方法,给出了典型断线形式下的复合序网接线图。该方法物理意义明确,计算简单,可用于同杆双回线复杂断线故障情况下的故障暂态过程研究,也是双回线非全相运行状态下保护动作行为分析的有效手段。

英文摘要：

A method based on three sequences is proposed for break-conductor fault analysis on double-circuit transmission lines. Considering possible different phenomena of the two circuits in real-world situation,the relationship of the three sequence networks and characteristics of the sequence electrical quantities are studied first. Then combining with the boundary conditions of the disconnected ports,a new approach for calculating the post-fault electric quantities is presented. In order to simplify calculation process and make the characteristics of fault sequence voltages and currents more intuitive,a method of interconnections of sequence networks is presented and drawings of interconnections of sequence networks for typical break conductor fault types are given. The method has a definite physical meaning and is simple in calculation. It can serve as a basic theoretical approach for studying fault transient process and protection action characteristic in open-phase operation state on double-circuit transmission lines.