利用单端电气量的同杆双回线故障定位研究

Research on a Fault Location Algorithm for Parallel Transmission Lines Using Single Terminal Data

提出了1种基于单端工频电气量的同杆双回线的故障定位算法。根据同杆双回线特殊的电气结构,算法仅使用本线路的单端电气量,利用本线路零序电流和双回线路的零序电流比表示相邻线路的零序电流。算法测距结果不受故障点过渡电阻、负荷电流和双回线路间零序互感的影响。考虑到高压长线路分布电容对测距结果的影响,本文对线路分布电容的充电电流进行了迭代补偿。PSCAD/EMTDC仿真结果表明,该算法应用于同杆双回线故障测距时具有较高的测距精度。

This paper presents a novel fault location algorithm by using the voltage and current collected at only the local end of a single-circuit for double transmission lines on the same tower. Based on the particular electrical structure of double transmission lines on the same tower, the proposed method uses the zero-sequence current factor and the zero-sequence current of theself-circuit to show the zero-sequence current of the adjacent parallel line, It isshown that the new method is independent of fault resistance, zero-sequence mutual inductance and load current, Considering the influence of the shunt capacitance in the high voltage long line, this method has compensated this influence. Extensive simulation studies using PSCAD/EMTDC have verified that this approach can obtain an accurate fault distance estimation.