超高压长线路故障测距研究

提出了一种适用于超高压长线路的故障测距方法。该方法基于线路分布参数模型,根据正序故障分量电压沿线分布规律,通过搜索迭代将故障点界定在一段短线路上,从而将分布参数长线测距转化为集中参数短线测距。该方法理论上不受故障过渡电阻的影响,不要求双端数据同步采样。采用反映各种故障的正序分量,不需事先确定故障相别。ATP仿真显示该方法有较高的精度。

Research on the EHV long-line fault locating

A fault locating algorithm for EHV long-line transmission lines is suggested based on the distributed parameter line model. The searching and iteration method is used to locate the fault point in a segment of short-line according to the distributed law of positive sequence fault component voltage. The problem of distributed parameter long-line fault locating is converted to that of the lumped parameter short-line fault locating. In theory this algorithm is not affected by fault resistance and does not need synchronous sampling of two terminal components. It does not need fault phase identification. The ATP simulation results show high accuracy of this algorithm.