考虑测距结果特性的T型输电线路非同步故障测距算法

针对现有T型输电线路非同步故障测距算法的缺点，基于分布参数提出了一种三端数据不需要同步的T型线路测距新算法。算法直接利用解析表达式求取3条支路上故障距T接节点的距离，利用测距结果的特性区分故障支路与非故障支路。算法不需要判断故障相别，无测距伪根，对不对称短路和对称短路都适用。理论分析和仿真结果表明算法不受不同步角度、过渡电阻、运行方式等影响，具有较高的测距精度和较快的计算速度。

Asynchronous Fault Location Algorithm for T-shaped Transmission Line Considering Characteristics of Location Result

To overcome the shortcomings of the existing asynchronous fault location algorithm for T-shaped transmission line, based on the distributed parameters, a new T-shaped line location algorithm without synchronization of three-terminal data is proposed. The algorithm directly uses analytical expressions to obtain the distance between the faults on the three branches and the T-shaped node, and adopts the characteristics of the fault location results to distinguish the fault branch from the normal branch. The algorithm does not need to judge the faulty phase. There is no pseudo fault location root, and the algorithm is applicable to both asymmetric short-circuit and symmetric short-circuit faults. Theoretical analysis and simulation results show that the algorithm is not affected by asynchronous angle, transition resistance, operation mode, etc., and has high fault location accuracy and faster calculation speed.