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中文摘要：
输电线路故障测距一直是经久不衰的研究课题，根据三相系统和同塔双回线系统的阻抗矩阵关系，从能用单一模量反映所有普通三相系统故障的新相模变换矩阵出发，推导出适用于双回线的相模变换矩阵。提出了一种基于新模量变换的双回线故障定位时域算法，该算法利用某一故障模量电弧电压、电流的转移特性来构造测距算法。它具有如下特点：算法在时域中进行，所需的时间窗短，不需要滤波等环节；用最小二乘法来提高测距精度，且测距的精度不受过渡电阻、故障类型及对端系统阻抗变化的影响。大量的电磁暂态仿真结果表明，该算法具有很高的精度。
英文摘要：
According to the relationship between the impedance matrix of three-phase system and parallel transmission line system, a novel phase mode transform matrix of parallel transmission line system was deduced from the phase-mode transform matrix of three-phase system which could reflect all types of faults by single mode, and a novel algorithm was put forward which was based on phase-mode transform for locating faults on coupling parallel transmission lines. The algorithm is obtained by the transfer characteristics relationship of the are voltage and current at one mode. The proposed algorithm has following characteristics： it is a time-domain method, and uses the method of least squares to improve the accuracy; it is independent of source impedance. Electromagnetic transient simulation indicates that the presented algorithm maintains high accuracy for two parallel transmission lines.
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