摘要
为了研究远距离输电线路不同位置单相短路故障对发电机及线路电气量的影响,利用PSD-BPA系统分析软件对输电线路在不同位置发生单相接地短路故障进行了仿真研究,得出了发电机功角、转速及线路电流的变化情况,重点对不同长度输电线路不同位置发生短路时的线路冲击电流特征进行了对比研究。结果表明,线路不同位置发生单相突然短路故障时,短路后线路的最大冲击电流与稳态电流的比值从首段至末端呈先减小后增大的变化规律,利用短路后线路电流最大冲击值与稳态值的比值,可快速有效地判断短路故障发生位置,为线路故障定位分析提供了必要参考。
In order to study the influence of single phase short -circuit fault at different positions on the electric variables of synchronous generator and transmission line,the single phase sudden short circuit of transmission line at different positions is simulated by means of the PSD-BPA software,and then the changing situation of power angle,speed of the synchronous generator and transmission line current are obtained.The single phase short circuit surge current of different length transmission line in different position is studied especially.The result shows that the ratio of surge current and steady-state current decrease firsdy and then increase from the origin of transmission line to the end,the fault position is judged effectively by the ratio of surge current and steady-state current.The result provides reasonable reference to fault location in power system transmission line.
出处
《陕西电力》
2012年第3期35-38,共4页
Shanxi Electric Power
