改进测距算法在超高压输电线路单端故障测距中的应用

为研究超高压输电线路的单端测距原理、寻求影响超高压金属性故障时单端测距的影响精度因素，根据原有定值参数引入并联电抗器参数和分布电容参数，采用极限逼近和迭代的数学分析方法计算不同故障情况下分布电容的故障电流，采用集中参数处理法计算并联电抗器的电流，使故障电流适应线路模型和故障类型的变化，并提出一种阻抗测距方法，通过理论推导和RTDS试验验证了该方法的有效性。

Application of Improved Fault Location Algorithm in Single ended EHV Lines Fault Location

In order to study the principle of single ended EHV lines fault location and precision influencing factors under EHV metal fault, parallel reactor parameter and distributed capacitance parameter are introduced based on original constant value. The limit approximation function and iterative method are adopted to calculate the fault current of distributed capacitance in different kind of faults. Parallel reactor current is calculated with lumped parameter method. Fault currents fit in with the change of line model and fault type. Thus, impedance fault location method is proposed. The theoretical derivation and RTDS experiment prove the effectiveness of the proposed method.