Abstract This paper presents a new fault location algorithm for three-terminal transmission lines, with the help of synchrophasor data. The algorithm utilizes the information of voltages and currents which are available from all the three ends. The proposed algorithm utilizes positive and negative sequence data for locating asymmetrical faults and only positive sequence data for locating symmetrical faults. The accuracy of the algorithm has been evaluated for various factors, such as fault inception angles, fault resistance, fault location, synchronization errors, measurement errors. The simulation of faults on the system have been carried out using PSCAD® and the algorithm is implemented in MATLAB software. Based on the simulation results it has been observed that the % error is less than 1.5% for 178 test cases out of 180, which shows 98.8% accuracy.

中文翻译：

---

基于同步相量的三端均质输电线路故障定位算法

摘要 本文提出了一种基于同步相量数据的三端输电线路故障定位新算法。该算法利用了从所有三端可用的电压和电流信息。所提出的算法利用正序和负序数据定位不对称故障，仅使用正序数据定位对称故障。算法的准确性已经针对各种因素进行了评估，例如故障起始角、故障电阻、故障定位、同步误差、测量误差。系统故障的仿真使用 PSCAD® 进行，算法在 MATLAB 软件中实现。根据仿真结果，已经观察到 180 个测试用例中的 178 个测试用例的百分比误差小于 1.5%，其中显示 98 个。