电弧故障是高压输电线路的多发故障 ,目前众多故障定位算法大多数把故障过渡电阻视为线性定常电阻。文中借鉴其他学者对电弧的研究成果 ,建立了电弧的理想电压—电流转移特性曲线和对应的电弧等效模型 ,提出了一种耦合双回高压输电线路故障测距单端信息时域的新方法。该方法不需要输入对端系统等值阻抗 ,解算中运用了最小二乘技术 ,从理论上保证了该测距算法具有较高的测距精度。大量数字试验表明该方法的正确性 Arc fault is a high voltage transmission line of multiple faults, many fault location algorithm most of the fault transition resistance as a linear constant resistance. Based on the research results of arc from other scholars, this paper established the ideal voltage-current transfer characteristic curve and corresponding arc equivalent model of arc, and proposed a new method of coupling the single-end information time domain of fault location in double-circuit high voltage transmission line . This method does not need to input the equivalent impedance of the opposite end system. The least square technique is used in the solution, which guarantees theoretically that the ranging algorithm has higher ranging accuracy. A large number of numerical experiments show the correctness of the method